AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-15 14:06:44 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity
48c29d0d27
linux_dsm_epyc7002/drivers/uwb/rsv.c
Kees Cook e99e88a9d2 treewide: setup_timer() -> timer_setup() 
This converts all remaining cases of the old setup_timer() API into using
timer_setup(), where the callback argument is the structure already
holding the struct timer_list. These should have no behavioral changes,
since they just change which pointer is passed into the callback with
the same available pointers after conversion. It handles the following
examples, in addition to some other variations.

Casting from unsigned long:

    void my_callback(unsigned long data)
    {
        struct something *ptr = (struct something *)data;
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, ptr);

and forced object casts:

    void my_callback(struct something *ptr)
    {
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, (unsigned long)ptr);

become:

    void my_callback(struct timer_list *t)
    {
        struct something *ptr = from_timer(ptr, t, my_timer);
    ...
    }
    ...
    timer_setup(&ptr->my_timer, my_callback, 0);

Direct function assignments:

    void my_callback(unsigned long data)
    {
        struct something *ptr = (struct something *)data;
    ...
    }
    ...
    ptr->my_timer.function = my_callback;

have a temporary cast added, along with converting the args:

    void my_callback(struct timer_list *t)
    {
        struct something *ptr = from_timer(ptr, t, my_timer);
    ...
    }
    ...
    ptr->my_timer.function = (TIMER_FUNC_TYPE)my_callback;

And finally, callbacks without a data assignment:

    void my_callback(unsigned long data)
    {
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, 0);

have their argument renamed to verify they're unused during conversion:

    void my_callback(struct timer_list *unused)
    {
    ...
    }
    ...
    timer_setup(&ptr->my_timer, my_callback, 0);

The conversion is done with the following Coccinelle script:

spatch --very-quiet --all-includes --include-headers \
	-I ./arch/x86/include -I ./arch/x86/include/generated \
	-I ./include -I ./arch/x86/include/uapi \
	-I ./arch/x86/include/generated/uapi -I ./include/uapi \
	-I ./include/generated/uapi --include ./include/linux/kconfig.h \
	--dir . \
	--cocci-file ~/src/data/timer_setup.cocci

@fix_address_of@
expression e;
@@

 setup_timer(
-&(e)
+&e
 , ...)

// Update any raw setup_timer() usages that have a NULL callback, but
// would otherwise match change_timer_function_usage, since the latter
// will update all function assignments done in the face of a NULL
// function initialization in setup_timer().
@change_timer_function_usage_NULL@
expression _E;
identifier _timer;
type _cast_data;
@@

(
-setup_timer(&_E->_timer, NULL, _E);
+timer_setup(&_E->_timer, NULL, 0);
|
-setup_timer(&_E->_timer, NULL, (_cast_data)_E);
+timer_setup(&_E->_timer, NULL, 0);
|
-setup_timer(&_E._timer, NULL, &_E);
+timer_setup(&_E._timer, NULL, 0);
|
-setup_timer(&_E._timer, NULL, (_cast_data)&_E);
+timer_setup(&_E._timer, NULL, 0);
)

@change_timer_function_usage@
expression _E;
identifier _timer;
struct timer_list _stl;
identifier _callback;
type _cast_func, _cast_data;
@@

(
-setup_timer(&_E->_timer, _callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, &_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, &_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)&_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)&_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, &_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, &_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
 _E->_timer@_stl.function = _callback;
|
 _E->_timer@_stl.function = &_callback;
|
 _E->_timer@_stl.function = (_cast_func)_callback;
|
 _E->_timer@_stl.function = (_cast_func)&_callback;
|
 _E._timer@_stl.function = _callback;
|
 _E._timer@_stl.function = &_callback;
|
 _E._timer@_stl.function = (_cast_func)_callback;
|
 _E._timer@_stl.function = (_cast_func)&_callback;
)

// callback(unsigned long arg)
@change_callback_handle_cast
 depends on change_timer_function_usage@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _origtype;
identifier _origarg;
type _handletype;
identifier _handle;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *t
 )
 {
(
	... when != _origarg
	_handletype *_handle =
-(_handletype *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle =
-(void *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle;
	... when != _handle
	_handle =
-(_handletype *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle;
	... when != _handle
	_handle =
-(void *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
)
 }

// callback(unsigned long arg) without existing variable
@change_callback_handle_cast_no_arg
 depends on change_timer_function_usage &&
                     !change_callback_handle_cast@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _origtype;
identifier _origarg;
type _handletype;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *t
 )
 {
+	_handletype *_origarg = from_timer(_origarg, t, _timer);
+
	... when != _origarg
-	(_handletype *)_origarg
+	_origarg
	... when != _origarg
 }

// Avoid already converted callbacks.
@match_callback_converted
 depends on change_timer_function_usage &&
            !change_callback_handle_cast &&
	    !change_callback_handle_cast_no_arg@
identifier change_timer_function_usage._callback;
identifier t;
@@

 void _callback(struct timer_list *t)
 { ... }

// callback(struct something *handle)
@change_callback_handle_arg
 depends on change_timer_function_usage &&
	    !match_callback_converted &&
            !change_callback_handle_cast &&
            !change_callback_handle_cast_no_arg@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _handletype;
identifier _handle;
@@

 void _callback(
-_handletype *_handle
+struct timer_list *t
 )
 {
+	_handletype *_handle = from_timer(_handle, t, _timer);
	...
 }

// If change_callback_handle_arg ran on an empty function, remove
// the added handler.
@unchange_callback_handle_arg
 depends on change_timer_function_usage &&
	    change_callback_handle_arg@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _handletype;
identifier _handle;
identifier t;
@@

 void _callback(struct timer_list *t)
 {
-	_handletype *_handle = from_timer(_handle, t, _timer);
 }

// We only want to refactor the setup_timer() data argument if we've found
// the matching callback. This undoes changes in change_timer_function_usage.
@unchange_timer_function_usage
 depends on change_timer_function_usage &&
            !change_callback_handle_cast &&
            !change_callback_handle_cast_no_arg &&
	    !change_callback_handle_arg@
expression change_timer_function_usage._E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type change_timer_function_usage._cast_data;
@@

(
-timer_setup(&_E->_timer, _callback, 0);
+setup_timer(&_E->_timer, _callback, (_cast_data)_E);
|
-timer_setup(&_E._timer, _callback, 0);
+setup_timer(&_E._timer, _callback, (_cast_data)&_E);
)

// If we fixed a callback from a .function assignment, fix the
// assignment cast now.
@change_timer_function_assignment
 depends on change_timer_function_usage &&
            (change_callback_handle_cast ||
             change_callback_handle_cast_no_arg ||
             change_callback_handle_arg)@
expression change_timer_function_usage._E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type _cast_func;
typedef TIMER_FUNC_TYPE;
@@

(
 _E->_timer.function =
-_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-(_cast_func)_callback;
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-(_cast_func)&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-&_callback;
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-(_cast_func)_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-(_cast_func)&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
)

// Sometimes timer functions are called directly. Replace matched args.
@change_timer_function_calls
 depends on change_timer_function_usage &&
            (change_callback_handle_cast ||
             change_callback_handle_cast_no_arg ||
             change_callback_handle_arg)@
expression _E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type _cast_data;
@@

 _callback(
(
-(_cast_data)_E
+&_E->_timer
|
-(_cast_data)&_E
+&_E._timer
|
-_E
+&_E->_timer
)
 )

// If a timer has been configured without a data argument, it can be
// converted without regard to the callback argument, since it is unused.
@match_timer_function_unused_data@
expression _E;
identifier _timer;
identifier _callback;
@@

(
-setup_timer(&_E->_timer, _callback, 0);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, 0L);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, 0UL);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0L);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0UL);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0L);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0UL);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0);
+timer_setup(_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0L);
+timer_setup(_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0UL);
+timer_setup(_timer, _callback, 0);
)

@change_callback_unused_data
 depends on match_timer_function_unused_data@
identifier match_timer_function_unused_data._callback;
type _origtype;
identifier _origarg;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *unused
 )
 {
	... when != _origarg
 }

Signed-off-by: Kees Cook <keescook@chromium.org>
2017-11-21 15:57:07 -08:00

1012 lines
27 KiB
C
Raw Blame History

/*
* UWB reservation management.
*
* Copyright (C) 2008 Cambridge Silicon Radio Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kernel.h>
#include <linux/uwb.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/export.h>
#include "uwb-internal.h"
static void uwb_rsv_timer(struct timer_list *t);
static const char *rsv_states[] = {
[UWB_RSV_STATE_NONE] = "none ",
[UWB_RSV_STATE_O_INITIATED] = "o initiated ",
[UWB_RSV_STATE_O_PENDING] = "o pending ",
[UWB_RSV_STATE_O_MODIFIED] = "o modified ",
[UWB_RSV_STATE_O_ESTABLISHED] = "o established ",
[UWB_RSV_STATE_O_TO_BE_MOVED] = "o to be moved ",
[UWB_RSV_STATE_O_MOVE_EXPANDING] = "o move expanding",
[UWB_RSV_STATE_O_MOVE_COMBINING] = "o move combining",
[UWB_RSV_STATE_O_MOVE_REDUCING] = "o move reducing ",
[UWB_RSV_STATE_T_ACCEPTED] = "t accepted ",
[UWB_RSV_STATE_T_CONFLICT] = "t conflict ",
[UWB_RSV_STATE_T_PENDING] = "t pending ",
[UWB_RSV_STATE_T_DENIED] = "t denied ",
[UWB_RSV_STATE_T_RESIZED] = "t resized ",
[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = "t expanding acc ",
[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = "t expanding conf",
[UWB_RSV_STATE_T_EXPANDING_PENDING] = "t expanding pend",
[UWB_RSV_STATE_T_EXPANDING_DENIED] = "t expanding den ",
};
static const char *rsv_types[] = {
[UWB_DRP_TYPE_ALIEN_BP] = "alien-bp",
[UWB_DRP_TYPE_HARD] = "hard",
[UWB_DRP_TYPE_SOFT] = "soft",
[UWB_DRP_TYPE_PRIVATE] = "private",
[UWB_DRP_TYPE_PCA] = "pca",
};
bool uwb_rsv_has_two_drp_ies(struct uwb_rsv *rsv)
{
static const bool has_two_drp_ies[] = {
[UWB_RSV_STATE_O_INITIATED] = false,
[UWB_RSV_STATE_O_PENDING] = false,
[UWB_RSV_STATE_O_MODIFIED] = false,
[UWB_RSV_STATE_O_ESTABLISHED] = false,
[UWB_RSV_STATE_O_TO_BE_MOVED] = false,
[UWB_RSV_STATE_O_MOVE_COMBINING] = false,
[UWB_RSV_STATE_O_MOVE_REDUCING] = false,
[UWB_RSV_STATE_O_MOVE_EXPANDING] = true,
[UWB_RSV_STATE_T_ACCEPTED] = false,
[UWB_RSV_STATE_T_CONFLICT] = false,
[UWB_RSV_STATE_T_PENDING] = false,
[UWB_RSV_STATE_T_DENIED] = false,
[UWB_RSV_STATE_T_RESIZED] = false,
[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = true,
[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = true,
[UWB_RSV_STATE_T_EXPANDING_PENDING] = true,
[UWB_RSV_STATE_T_EXPANDING_DENIED] = true,
};
return has_two_drp_ies[rsv->state];
}
/**
* uwb_rsv_state_str - return a string for a reservation state
* @state: the reservation state.
*/
const char *uwb_rsv_state_str(enum uwb_rsv_state state)
{
if (state < UWB_RSV_STATE_NONE || state >= UWB_RSV_STATE_LAST)
return "unknown";
return rsv_states[state];
}
EXPORT_SYMBOL_GPL(uwb_rsv_state_str);
/**
* uwb_rsv_type_str - return a string for a reservation type
* @type: the reservation type
*/
const char *uwb_rsv_type_str(enum uwb_drp_type type)
{
if (type < UWB_DRP_TYPE_ALIEN_BP || type > UWB_DRP_TYPE_PCA)
return "invalid";
return rsv_types[type];
}
EXPORT_SYMBOL_GPL(uwb_rsv_type_str);
void uwb_rsv_dump(char *text, struct uwb_rsv *rsv)
{
struct device *dev = &rsv->rc->uwb_dev.dev;
struct uwb_dev_addr devaddr;
char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr);
if (rsv->target.type == UWB_RSV_TARGET_DEV)
devaddr = rsv->target.dev->dev_addr;
else
devaddr = rsv->target.devaddr;
uwb_dev_addr_print(target, sizeof(target), &devaddr);
dev_dbg(dev, "rsv %s %s -> %s: %s\n",
text, owner, target, uwb_rsv_state_str(rsv->state));
}
static void uwb_rsv_release(struct kref *kref)
{
struct uwb_rsv *rsv = container_of(kref, struct uwb_rsv, kref);
kfree(rsv);
}
void uwb_rsv_get(struct uwb_rsv *rsv)
{
kref_get(&rsv->kref);
}
void uwb_rsv_put(struct uwb_rsv *rsv)
{
kref_put(&rsv->kref, uwb_rsv_release);
}
/*
* Get a free stream index for a reservation.
*
* If the target is a DevAddr (e.g., a WUSB cluster reservation) then
* the stream is allocated from a pool of per-RC stream indexes,
* otherwise a unique stream index for the target is selected.
*/
static int uwb_rsv_get_stream(struct uwb_rsv *rsv)
{
struct uwb_rc *rc = rsv->rc;
struct device *dev = &rc->uwb_dev.dev;
unsigned long *streams_bm;
int stream;
switch (rsv->target.type) {
case UWB_RSV_TARGET_DEV:
streams_bm = rsv->target.dev->streams;
break;
case UWB_RSV_TARGET_DEVADDR:
streams_bm = rc->uwb_dev.streams;
break;
default:
return -EINVAL;
}
stream = find_first_zero_bit(streams_bm, UWB_NUM_STREAMS);
if (stream >= UWB_NUM_STREAMS) {
dev_err(dev, "%s: no available stream found\n", __func__);
return -EBUSY;
}
rsv->stream = stream;
set_bit(stream, streams_bm);
dev_dbg(dev, "get stream %d\n", rsv->stream);
return 0;
}
static void uwb_rsv_put_stream(struct uwb_rsv *rsv)
{
struct uwb_rc *rc = rsv->rc;
struct device *dev = &rc->uwb_dev.dev;
unsigned long *streams_bm;
switch (rsv->target.type) {
case UWB_RSV_TARGET_DEV:
streams_bm = rsv->target.dev->streams;
break;
case UWB_RSV_TARGET_DEVADDR:
streams_bm = rc->uwb_dev.streams;
break;
default:
return;
}
clear_bit(rsv->stream, streams_bm);
dev_dbg(dev, "put stream %d\n", rsv->stream);
}
void uwb_rsv_backoff_win_timer(struct timer_list *t)
{
struct uwb_drp_backoff_win *bow = from_timer(bow, t, timer);
struct uwb_rc *rc = container_of(bow, struct uwb_rc, bow);
struct device *dev = &rc->uwb_dev.dev;
bow->can_reserve_extra_mases = true;
if (bow->total_expired <= 4) {
bow->total_expired++;
} else {
/* after 4 backoff window has expired we can exit from
* the backoff procedure */
bow->total_expired = 0;
bow->window = UWB_DRP_BACKOFF_WIN_MIN >> 1;
}
dev_dbg(dev, "backoff_win_timer total_expired=%d, n=%d\n", bow->total_expired, bow->n);
/* try to relocate all the "to be moved" relocations */
uwb_rsv_handle_drp_avail_change(rc);
}
void uwb_rsv_backoff_win_increment(struct uwb_rc *rc)
{
struct uwb_drp_backoff_win *bow = &rc->bow;
struct device *dev = &rc->uwb_dev.dev;
unsigned timeout_us;
dev_dbg(dev, "backoff_win_increment: window=%d\n", bow->window);
bow->can_reserve_extra_mases = false;
if((bow->window << 1) == UWB_DRP_BACKOFF_WIN_MAX)
return;
bow->window <<= 1;
bow->n = prandom_u32() & (bow->window - 1);
dev_dbg(dev, "new_window=%d, n=%d\n", bow->window, bow->n);
/* reset the timer associated variables */
timeout_us = bow->n * UWB_SUPERFRAME_LENGTH_US;
bow->total_expired = 0;
mod_timer(&bow->timer, jiffies + usecs_to_jiffies(timeout_us));
}
static void uwb_rsv_stroke_timer(struct uwb_rsv *rsv)
{
int sframes = UWB_MAX_LOST_BEACONS;
/*
* Multicast reservations can become established within 1
* super frame and should not be terminated if no response is
* received.
*/
if (rsv->state == UWB_RSV_STATE_NONE) {
sframes = 0;
} else if (rsv->is_multicast) {
if (rsv->state == UWB_RSV_STATE_O_INITIATED
|| rsv->state == UWB_RSV_STATE_O_MOVE_EXPANDING
|| rsv->state == UWB_RSV_STATE_O_MOVE_COMBINING
|| rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING)
sframes = 1;
if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED)
sframes = 0;
}
if (sframes > 0) {
/*
* Add an additional 2 superframes to account for the
* time to send the SET DRP IE command.
*/
unsigned timeout_us = (sframes + 2) * UWB_SUPERFRAME_LENGTH_US;
mod_timer(&rsv->timer, jiffies + usecs_to_jiffies(timeout_us));
} else
del_timer(&rsv->timer);
}
/*
* Update a reservations state, and schedule an update of the
* transmitted DRP IEs.
*/
static void uwb_rsv_state_update(struct uwb_rsv *rsv,
enum uwb_rsv_state new_state)
{
rsv->state = new_state;
rsv->ie_valid = false;
uwb_rsv_dump("SU", rsv);
uwb_rsv_stroke_timer(rsv);
uwb_rsv_sched_update(rsv->rc);
}
static void uwb_rsv_callback(struct uwb_rsv *rsv)
{
if (rsv->callback)
rsv->callback(rsv);
}
void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state)
{
struct uwb_rsv_move *mv = &rsv->mv;
if (rsv->state == new_state) {
switch (rsv->state) {
case UWB_RSV_STATE_O_ESTABLISHED:
case UWB_RSV_STATE_O_MOVE_EXPANDING:
case UWB_RSV_STATE_O_MOVE_COMBINING:
case UWB_RSV_STATE_O_MOVE_REDUCING:
case UWB_RSV_STATE_T_ACCEPTED:
case UWB_RSV_STATE_T_EXPANDING_ACCEPTED:
case UWB_RSV_STATE_T_RESIZED:
case UWB_RSV_STATE_NONE:
uwb_rsv_stroke_timer(rsv);
break;
default:
/* Expecting a state transition so leave timer
as-is. */
break;
}
return;
}
uwb_rsv_dump("SC", rsv);
switch (new_state) {
case UWB_RSV_STATE_NONE:
uwb_rsv_state_update(rsv, UWB_RSV_STATE_NONE);
uwb_rsv_remove(rsv);
uwb_rsv_callback(rsv);
break;
case UWB_RSV_STATE_O_INITIATED:
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_INITIATED);
break;
case UWB_RSV_STATE_O_PENDING:
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_PENDING);
break;
case UWB_RSV_STATE_O_MODIFIED:
/* in the companion there are the MASes to drop */
bitmap_andnot(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS);
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MODIFIED);
break;
case UWB_RSV_STATE_O_ESTABLISHED:
if (rsv->state == UWB_RSV_STATE_O_MODIFIED
|| rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING) {
uwb_drp_avail_release(rsv->rc, &mv->companion_mas);
rsv->needs_release_companion_mas = false;
}
uwb_drp_avail_reserve(rsv->rc, &rsv->mas);
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_ESTABLISHED);
uwb_rsv_callback(rsv);
break;
case UWB_RSV_STATE_O_MOVE_EXPANDING:
rsv->needs_release_companion_mas = true;
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING);
break;
case UWB_RSV_STATE_O_MOVE_COMBINING:
rsv->needs_release_companion_mas = false;
uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas);
bitmap_or(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS);
rsv->mas.safe += mv->companion_mas.safe;
rsv->mas.unsafe += mv->companion_mas.unsafe;
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_COMBINING);
break;
case UWB_RSV_STATE_O_MOVE_REDUCING:
bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS);
rsv->needs_release_companion_mas = true;
rsv->mas.safe = mv->final_mas.safe;
rsv->mas.unsafe = mv->final_mas.unsafe;
bitmap_copy(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS);
bitmap_copy(rsv->mas.unsafe_bm, mv->final_mas.unsafe_bm, UWB_NUM_MAS);
uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_REDUCING);
break;
case UWB_RSV_STATE_T_ACCEPTED:
case UWB_RSV_STATE_T_RESIZED:
rsv->needs_release_companion_mas = false;
uwb_drp_avail_reserve(rsv->rc, &rsv->mas);
uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_ACCEPTED);
uwb_rsv_callback(rsv);
break;
case UWB_RSV_STATE_T_DENIED:
uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_DENIED);
break;
case UWB_RSV_STATE_T_CONFLICT:
uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_CONFLICT);
break;
case UWB_RSV_STATE_T_PENDING:
uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_PENDING);
break;
case UWB_RSV_STATE_T_EXPANDING_ACCEPTED:
rsv->needs_release_companion_mas = true;
uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas);
uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_EXPANDING_ACCEPTED);
break;
default:
dev_err(&rsv->rc->uwb_dev.dev, "unhandled state: %s (%d)\n",
uwb_rsv_state_str(new_state), new_state);
}
}
static void uwb_rsv_handle_timeout_work(struct work_struct *work)
{
struct uwb_rsv *rsv = container_of(work, struct uwb_rsv,
handle_timeout_work);
struct uwb_rc *rc = rsv->rc;
mutex_lock(&rc->rsvs_mutex);
uwb_rsv_dump("TO", rsv);
switch (rsv->state) {
case UWB_RSV_STATE_O_INITIATED:
if (rsv->is_multicast) {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
goto unlock;
}
break;
case UWB_RSV_STATE_O_MOVE_EXPANDING:
if (rsv->is_multicast) {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING);
goto unlock;
}
break;
case UWB_RSV_STATE_O_MOVE_COMBINING:
if (rsv->is_multicast) {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING);
goto unlock;
}
break;
case UWB_RSV_STATE_O_MOVE_REDUCING:
if (rsv->is_multicast) {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
goto unlock;
}
break;
case UWB_RSV_STATE_O_ESTABLISHED:
if (rsv->is_multicast)
goto unlock;
break;
case UWB_RSV_STATE_T_EXPANDING_ACCEPTED:
/*
* The time out could be for the main or of the
* companion DRP, assume it's for the companion and
* drop that first. A further time out is required to
* drop the main.
*/
uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED);
uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas);
goto unlock;
case UWB_RSV_STATE_NONE:
goto unlock;
default:
break;
}
uwb_rsv_remove(rsv);
unlock:
mutex_unlock(&rc->rsvs_mutex);
}
static struct uwb_rsv *uwb_rsv_alloc(struct uwb_rc *rc)
{
struct uwb_rsv *rsv;
rsv = kzalloc(sizeof(struct uwb_rsv), GFP_KERNEL);
if (!rsv)
return NULL;
INIT_LIST_HEAD(&rsv->rc_node);
INIT_LIST_HEAD(&rsv->pal_node);
kref_init(&rsv->kref);
timer_setup(&rsv->timer, uwb_rsv_timer, 0);
rsv->rc = rc;
INIT_WORK(&rsv->handle_timeout_work, uwb_rsv_handle_timeout_work);
return rsv;
}
/**
* uwb_rsv_create - allocate and initialize a UWB reservation structure
* @rc: the radio controller
* @cb: callback to use when the reservation completes or terminates
* @pal_priv: data private to the PAL to be passed in the callback
*
* The callback is called when the state of the reservation changes from:
*
* - pending to accepted
* - pending to denined
* - accepted to terminated
* - pending to terminated
*/
struct uwb_rsv *uwb_rsv_create(struct uwb_rc *rc, uwb_rsv_cb_f cb, void *pal_priv)
{
struct uwb_rsv *rsv;
rsv = uwb_rsv_alloc(rc);
if (!rsv)
return NULL;
rsv->callback = cb;
rsv->pal_priv = pal_priv;
return rsv;
}
EXPORT_SYMBOL_GPL(uwb_rsv_create);
void uwb_rsv_remove(struct uwb_rsv *rsv)
{
uwb_rsv_dump("RM", rsv);
if (rsv->state != UWB_RSV_STATE_NONE)
uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE);
if (rsv->needs_release_companion_mas)
uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas);
uwb_drp_avail_release(rsv->rc, &rsv->mas);
if (uwb_rsv_is_owner(rsv))
uwb_rsv_put_stream(rsv);
uwb_dev_put(rsv->owner);
if (rsv->target.type == UWB_RSV_TARGET_DEV)
uwb_dev_put(rsv->target.dev);
list_del_init(&rsv->rc_node);
uwb_rsv_put(rsv);
}
/**
* uwb_rsv_destroy - free a UWB reservation structure
* @rsv: the reservation to free
*
* The reservation must already be terminated.
*/
void uwb_rsv_destroy(struct uwb_rsv *rsv)
{
uwb_rsv_put(rsv);
}
EXPORT_SYMBOL_GPL(uwb_rsv_destroy);
/**
* usb_rsv_establish - start a reservation establishment
* @rsv: the reservation
*
* The PAL should fill in @rsv's owner, target, type, max_mas,
* min_mas, max_interval and is_multicast fields. If the target is a
* uwb_dev it must be referenced.
*
* The reservation's callback will be called when the reservation is
* accepted, denied or times out.
*/
int uwb_rsv_establish(struct uwb_rsv *rsv)
{
struct uwb_rc *rc = rsv->rc;
struct uwb_mas_bm available;
struct device *dev = &rc->uwb_dev.dev;
int ret;
mutex_lock(&rc->rsvs_mutex);
ret = uwb_rsv_get_stream(rsv);
if (ret) {
dev_err(dev, "%s: uwb_rsv_get_stream failed: %d\n",
__func__, ret);
goto out;
}
rsv->tiebreaker = prandom_u32() & 1;
/* get available mas bitmap */
uwb_drp_available(rc, &available);
ret = uwb_rsv_find_best_allocation(rsv, &available, &rsv->mas);
if (ret == UWB_RSV_ALLOC_NOT_FOUND) {
ret = -EBUSY;
uwb_rsv_put_stream(rsv);
dev_err(dev, "%s: uwb_rsv_find_best_allocation failed: %d\n",
__func__, ret);
goto out;
}
ret = uwb_drp_avail_reserve_pending(rc, &rsv->mas);
if (ret != 0) {
uwb_rsv_put_stream(rsv);
dev_err(dev, "%s: uwb_drp_avail_reserve_pending failed: %d\n",
__func__, ret);
goto out;
}
uwb_rsv_get(rsv);
list_add_tail(&rsv->rc_node, &rc->reservations);
rsv->owner = &rc->uwb_dev;
uwb_dev_get(rsv->owner);
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_INITIATED);
out:
mutex_unlock(&rc->rsvs_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(uwb_rsv_establish);
/**
* uwb_rsv_modify - modify an already established reservation
* @rsv: the reservation to modify
* @max_mas: new maximum MAS to reserve
* @min_mas: new minimum MAS to reserve
* @max_interval: new max_interval to use
*
* FIXME: implement this once there are PALs that use it.
*/
int uwb_rsv_modify(struct uwb_rsv *rsv, int max_mas, int min_mas, int max_interval)
{
return -ENOSYS;
}
EXPORT_SYMBOL_GPL(uwb_rsv_modify);
/*
* move an already established reservation (rc->rsvs_mutex must to be
* taken when tis function is called)
*/
int uwb_rsv_try_move(struct uwb_rsv *rsv, struct uwb_mas_bm *available)
{
struct uwb_rc *rc = rsv->rc;
struct uwb_drp_backoff_win *bow = &rc->bow;
struct device *dev = &rc->uwb_dev.dev;
struct uwb_rsv_move *mv;
int ret = 0;
if (bow->can_reserve_extra_mases == false)
return -EBUSY;
mv = &rsv->mv;
if (uwb_rsv_find_best_allocation(rsv, available, &mv->final_mas) == UWB_RSV_ALLOC_FOUND) {
if (!bitmap_equal(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS)) {
/* We want to move the reservation */
bitmap_andnot(mv->companion_mas.bm, mv->final_mas.bm, rsv->mas.bm, UWB_NUM_MAS);
uwb_drp_avail_reserve_pending(rc, &mv->companion_mas);
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING);
}
} else {
dev_dbg(dev, "new allocation not found\n");
}
return ret;
}
/* It will try to move every reservation in state O_ESTABLISHED giving
* to the MAS allocator algorithm an availability that is the real one
* plus the allocation already established from the reservation. */
void uwb_rsv_handle_drp_avail_change(struct uwb_rc *rc)
{
struct uwb_drp_backoff_win *bow = &rc->bow;
struct uwb_rsv *rsv;
struct uwb_mas_bm mas;
if (bow->can_reserve_extra_mases == false)
return;
list_for_each_entry(rsv, &rc->reservations, rc_node) {
if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED ||
rsv->state == UWB_RSV_STATE_O_TO_BE_MOVED) {
uwb_drp_available(rc, &mas);
bitmap_or(mas.bm, mas.bm, rsv->mas.bm, UWB_NUM_MAS);
uwb_rsv_try_move(rsv, &mas);
}
}
}
/**
* uwb_rsv_terminate - terminate an established reservation
* @rsv: the reservation to terminate
*
* A reservation is terminated by removing the DRP IE from the beacon,
* the other end will consider the reservation to be terminated when
* it does not see the DRP IE for at least mMaxLostBeacons.
*
* If applicable, the reference to the target uwb_dev will be released.
*/
void uwb_rsv_terminate(struct uwb_rsv *rsv)
{
struct uwb_rc *rc = rsv->rc;
mutex_lock(&rc->rsvs_mutex);
if (rsv->state != UWB_RSV_STATE_NONE)
uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE);
mutex_unlock(&rc->rsvs_mutex);
}
EXPORT_SYMBOL_GPL(uwb_rsv_terminate);
/**
* uwb_rsv_accept - accept a new reservation from a peer
* @rsv: the reservation
* @cb: call back for reservation changes
* @pal_priv: data to be passed in the above call back
*
* Reservation requests from peers are denied unless a PAL accepts it
* by calling this function.
*
* The PAL call uwb_rsv_destroy() for all accepted reservations before
* calling uwb_pal_unregister().
*/
void uwb_rsv_accept(struct uwb_rsv *rsv, uwb_rsv_cb_f cb, void *pal_priv)
{
uwb_rsv_get(rsv);
rsv->callback = cb;
rsv->pal_priv = pal_priv;
rsv->state = UWB_RSV_STATE_T_ACCEPTED;
}
EXPORT_SYMBOL_GPL(uwb_rsv_accept);
/*
* Is a received DRP IE for this reservation?
*/
static bool uwb_rsv_match(struct uwb_rsv *rsv, struct uwb_dev *src,
struct uwb_ie_drp *drp_ie)
{
struct uwb_dev_addr *rsv_src;
int stream;
stream = uwb_ie_drp_stream_index(drp_ie);
if (rsv->stream != stream)
return false;
switch (rsv->target.type) {
case UWB_RSV_TARGET_DEVADDR:
return rsv->stream == stream;
case UWB_RSV_TARGET_DEV:
if (uwb_ie_drp_owner(drp_ie))
rsv_src = &rsv->owner->dev_addr;
else
rsv_src = &rsv->target.dev->dev_addr;
return uwb_dev_addr_cmp(&src->dev_addr, rsv_src) == 0;
}
return false;
}
static struct uwb_rsv *uwb_rsv_new_target(struct uwb_rc *rc,
struct uwb_dev *src,
struct uwb_ie_drp *drp_ie)
{
struct uwb_rsv *rsv;
struct uwb_pal *pal;
enum uwb_rsv_state state;
rsv = uwb_rsv_alloc(rc);
if (!rsv)
return NULL;
rsv->rc = rc;
rsv->owner = src;
uwb_dev_get(rsv->owner);
rsv->target.type = UWB_RSV_TARGET_DEV;
rsv->target.dev = &rc->uwb_dev;
uwb_dev_get(&rc->uwb_dev);
rsv->type = uwb_ie_drp_type(drp_ie);
rsv->stream = uwb_ie_drp_stream_index(drp_ie);
uwb_drp_ie_to_bm(&rsv->mas, drp_ie);
/*
* See if any PALs are interested in this reservation. If not,
* deny the request.
*/
rsv->state = UWB_RSV_STATE_T_DENIED;
mutex_lock(&rc->uwb_dev.mutex);
list_for_each_entry(pal, &rc->pals, node) {
if (pal->new_rsv)
pal->new_rsv(pal, rsv);
if (rsv->state == UWB_RSV_STATE_T_ACCEPTED)
break;
}
mutex_unlock(&rc->uwb_dev.mutex);
list_add_tail(&rsv->rc_node, &rc->reservations);
state = rsv->state;
rsv->state = UWB_RSV_STATE_NONE;
/* FIXME: do something sensible here */
if (state == UWB_RSV_STATE_T_ACCEPTED
&& uwb_drp_avail_reserve_pending(rc, &rsv->mas) == -EBUSY) {
/* FIXME: do something sensible here */
} else {
uwb_rsv_set_state(rsv, state);
}
return rsv;
}
/**
* uwb_rsv_get_usable_mas - get the bitmap of the usable MAS of a reservations
* @rsv: the reservation.
* @mas: returns the available MAS.
*
* The usable MAS of a reservation may be less than the negotiated MAS
* if alien BPs are present.
*/
void uwb_rsv_get_usable_mas(struct uwb_rsv *rsv, struct uwb_mas_bm *mas)
{
bitmap_zero(mas->bm, UWB_NUM_MAS);
bitmap_andnot(mas->bm, rsv->mas.bm, rsv->rc->cnflt_alien_bitmap.bm, UWB_NUM_MAS);
}
EXPORT_SYMBOL_GPL(uwb_rsv_get_usable_mas);
/**
* uwb_rsv_find - find a reservation for a received DRP IE.
* @rc: the radio controller
* @src: source of the DRP IE
* @drp_ie: the DRP IE
*
* If the reservation cannot be found and the DRP IE is from a peer
* attempting to establish a new reservation, create a new reservation
* and add it to the list.
*/
struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src,
struct uwb_ie_drp *drp_ie)
{
struct uwb_rsv *rsv;
list_for_each_entry(rsv, &rc->reservations, rc_node) {
if (uwb_rsv_match(rsv, src, drp_ie))
return rsv;
}
if (uwb_ie_drp_owner(drp_ie))
return uwb_rsv_new_target(rc, src, drp_ie);
return NULL;
}
/*
* Go through all the reservations and check for timeouts and (if
* necessary) update their DRP IEs.
*
* FIXME: look at building the SET_DRP_IE command here rather than
* having to rescan the list in uwb_rc_send_all_drp_ie().
*/
static bool uwb_rsv_update_all(struct uwb_rc *rc)
{
struct uwb_rsv *rsv, *t;
bool ie_updated = false;
list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) {
if (!rsv->ie_valid) {
uwb_drp_ie_update(rsv);
ie_updated = true;
}
}
return ie_updated;
}
void uwb_rsv_queue_update(struct uwb_rc *rc)
{
unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE;
queue_delayed_work(rc->rsv_workq, &rc->rsv_update_work, usecs_to_jiffies(delay_us));
}
/**
* uwb_rsv_sched_update - schedule an update of the DRP IEs
* @rc: the radio controller.
*
* To improve performance and ensure correctness with [ECMA-368] the
* number of SET-DRP-IE commands that are done are limited.
*
* DRP IEs update come from two sources: DRP events from the hardware
* which all occur at the beginning of the superframe ('syncronous'
* events) and reservation establishment/termination requests from
* PALs or timers ('asynchronous' events).
*
* A delayed work ensures that all the synchronous events result in
* one SET-DRP-IE command.
*
* Additional logic (the set_drp_ie_pending and rsv_updated_postponed
* flags) will prevent an asynchrous event starting a SET-DRP-IE
* command if one is currently awaiting a response.
*
* FIXME: this does leave a window where an asynchrous event can delay
* the SET-DRP-IE for a synchronous event by one superframe.
*/
void uwb_rsv_sched_update(struct uwb_rc *rc)
{
spin_lock_irq(&rc->rsvs_lock);
if (!delayed_work_pending(&rc->rsv_update_work)) {
if (rc->set_drp_ie_pending > 0) {
rc->set_drp_ie_pending++;
goto unlock;
}
uwb_rsv_queue_update(rc);
}
unlock:
spin_unlock_irq(&rc->rsvs_lock);
}
/*
* Update DRP IEs and, if necessary, the DRP Availability IE and send
* the updated IEs to the radio controller.
*/
static void uwb_rsv_update_work(struct work_struct *work)
{
struct uwb_rc *rc = container_of(work, struct uwb_rc,
rsv_update_work.work);
bool ie_updated;
mutex_lock(&rc->rsvs_mutex);
ie_updated = uwb_rsv_update_all(rc);
if (!rc->drp_avail.ie_valid) {
uwb_drp_avail_ie_update(rc);
ie_updated = true;
}
if (ie_updated && (rc->set_drp_ie_pending == 0))
uwb_rc_send_all_drp_ie(rc);
mutex_unlock(&rc->rsvs_mutex);
}
static void uwb_rsv_alien_bp_work(struct work_struct *work)
{
struct uwb_rc *rc = container_of(work, struct uwb_rc,
rsv_alien_bp_work.work);
struct uwb_rsv *rsv;
mutex_lock(&rc->rsvs_mutex);
list_for_each_entry(rsv, &rc->reservations, rc_node) {
if (rsv->type != UWB_DRP_TYPE_ALIEN_BP) {
uwb_rsv_callback(rsv);
}
}
mutex_unlock(&rc->rsvs_mutex);
}
static void uwb_rsv_timer(struct timer_list *t)
{
struct uwb_rsv *rsv = from_timer(rsv, t, timer);
queue_work(rsv->rc->rsv_workq, &rsv->handle_timeout_work);
}
/**
* uwb_rsv_remove_all - remove all reservations
* @rc: the radio controller
*
* A DRP IE update is not done.
*/
void uwb_rsv_remove_all(struct uwb_rc *rc)
{
struct uwb_rsv *rsv, *t;
mutex_lock(&rc->rsvs_mutex);
list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) {
if (rsv->state != UWB_RSV_STATE_NONE)
uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE);
del_timer_sync(&rsv->timer);
}
/* Cancel any postponed update. */
rc->set_drp_ie_pending = 0;
mutex_unlock(&rc->rsvs_mutex);
cancel_delayed_work_sync(&rc->rsv_update_work);
flush_workqueue(rc->rsv_workq);
mutex_lock(&rc->rsvs_mutex);
list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) {
uwb_rsv_remove(rsv);
}
mutex_unlock(&rc->rsvs_mutex);
}
void uwb_rsv_init(struct uwb_rc *rc)
{
INIT_LIST_HEAD(&rc->reservations);
INIT_LIST_HEAD(&rc->cnflt_alien_list);
mutex_init(&rc->rsvs_mutex);
spin_lock_init(&rc->rsvs_lock);
INIT_DELAYED_WORK(&rc->rsv_update_work, uwb_rsv_update_work);
INIT_DELAYED_WORK(&rc->rsv_alien_bp_work, uwb_rsv_alien_bp_work);
rc->bow.can_reserve_extra_mases = true;
rc->bow.total_expired = 0;
rc->bow.window = UWB_DRP_BACKOFF_WIN_MIN >> 1;
timer_setup(&rc->bow.timer, uwb_rsv_backoff_win_timer, 0);
bitmap_complement(rc->uwb_dev.streams, rc->uwb_dev.streams, UWB_NUM_STREAMS);
}
int uwb_rsv_setup(struct uwb_rc *rc)
{
char name[16];
snprintf(name, sizeof(name), "%s_rsvd", dev_name(&rc->uwb_dev.dev));
rc->rsv_workq = create_singlethread_workqueue(name);
if (rc->rsv_workq == NULL)
return -ENOMEM;
return 0;
}
void uwb_rsv_cleanup(struct uwb_rc *rc)
{
uwb_rsv_remove_all(rc);
destroy_workqueue(rc->rsv_workq);
}
Reference in New Issue View Git Blame Copy Permalink