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linux_dsm_epyc7002/drivers/usb/core/devio.c
David Brownell 72ebddb59a [PATCH] USB: turn a user mode driver error into a hard error 
This patch turns a user mode driver error into a hard error, and updates
the relevant diagnostic slightly to help troubleshooting.  gphoto was
known to have this problem, hopefully it is now fixed (they have had
plenty of warning...)

This had been left as a soft error to give various user mode drivers a
change to be properly fixed, with the statement that starting in about
2.6.10 it would be changed.  It had been mostly safe as a soft error ...
but that can not be guaranteed.  Now that a year has passed, it's time to
really insist that the user mode drivers finally fix their relevant bugs.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-06-27 14:43:42 -07:00

1474 lines
38 KiB
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/*****************************************************************************/
/*
* devio.c -- User space communication with USB devices.
*
* Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
*
* This file implements the usbfs/x/y files, where
* x is the bus number and y the device number.
*
* It allows user space programs/"drivers" to communicate directly
* with USB devices without intervening kernel driver.
*
* Revision history
* 22.12.1999 0.1 Initial release (split from proc_usb.c)
* 04.01.2000 0.2 Turned into its own filesystem
*/
/*****************************************************************************/
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/signal.h>
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usbdevice_fs.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#include <linux/moduleparam.h>
#include "hcd.h" /* for usbcore internals */
#include "usb.h"
struct async {
struct list_head asynclist;
struct dev_state *ps;
struct task_struct *task;
unsigned int signr;
unsigned int ifnum;
void __user *userbuffer;
void __user *userurb;
struct urb *urb;
};
static int usbfs_snoop = 0;
module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
#define snoop(dev, format, arg...) \
do { \
if (usbfs_snoop) \
dev_info( dev , format , ## arg); \
} while (0)
#define MAX_USBFS_BUFFER_SIZE 16384
static inline int connected (struct usb_device *dev)
{
return dev->state != USB_STATE_NOTATTACHED;
}
static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
{
loff_t ret;
lock_kernel();
switch (orig) {
case 0:
file->f_pos = offset;
ret = file->f_pos;
break;
case 1:
file->f_pos += offset;
ret = file->f_pos;
break;
case 2:
default:
ret = -EINVAL;
}
unlock_kernel();
return ret;
}
static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
{
struct dev_state *ps = (struct dev_state *)file->private_data;
struct usb_device *dev = ps->dev;
ssize_t ret = 0;
unsigned len;
loff_t pos;
int i;
pos = *ppos;
usb_lock_device(dev);
if (!connected(dev)) {
ret = -ENODEV;
goto err;
} else if (pos < 0) {
ret = -EINVAL;
goto err;
}
if (pos < sizeof(struct usb_device_descriptor)) {
struct usb_device_descriptor *desc = kmalloc(sizeof(*desc), GFP_KERNEL);
if (!desc) {
ret = -ENOMEM;
goto err;
}
memcpy(desc, &dev->descriptor, sizeof(dev->descriptor));
le16_to_cpus(&desc->bcdUSB);
le16_to_cpus(&desc->idVendor);
le16_to_cpus(&desc->idProduct);
le16_to_cpus(&desc->bcdDevice);
len = sizeof(struct usb_device_descriptor) - pos;
if (len > nbytes)
len = nbytes;
if (copy_to_user(buf, ((char *)desc) + pos, len)) {
kfree(desc);
ret = -EFAULT;
goto err;
}
kfree(desc);
*ppos += len;
buf += len;
nbytes -= len;
ret += len;
}
pos = sizeof(struct usb_device_descriptor);
for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
struct usb_config_descriptor *config =
(struct usb_config_descriptor *)dev->rawdescriptors[i];
unsigned int length = le16_to_cpu(config->wTotalLength);
if (*ppos < pos + length) {
/* The descriptor may claim to be longer than it
* really is. Here is the actual allocated length. */
unsigned alloclen =
le16_to_cpu(dev->config[i].desc.wTotalLength);
len = length - (*ppos - pos);
if (len > nbytes)
len = nbytes;
/* Simply don't write (skip over) unallocated parts */
if (alloclen > (*ppos - pos)) {
alloclen -= (*ppos - pos);
if (copy_to_user(buf,
dev->rawdescriptors[i] + (*ppos - pos),
min(len, alloclen))) {
ret = -EFAULT;
goto err;
}
}
*ppos += len;
buf += len;
nbytes -= len;
ret += len;
}
pos += length;
}
err:
usb_unlock_device(dev);
return ret;
}
/*
* async list handling
*/
static struct async *alloc_async(unsigned int numisoframes)
{
unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
struct async *as = kmalloc(assize, GFP_KERNEL);
if (!as)
return NULL;
memset(as, 0, assize);
as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
if (!as->urb) {
kfree(as);
return NULL;
}
return as;
}
static void free_async(struct async *as)
{
kfree(as->urb->transfer_buffer);
kfree(as->urb->setup_packet);
usb_free_urb(as->urb);
kfree(as);
}
static inline void async_newpending(struct async *as)
{
struct dev_state *ps = as->ps;
unsigned long flags;
spin_lock_irqsave(&ps->lock, flags);
list_add_tail(&as->asynclist, &ps->async_pending);
spin_unlock_irqrestore(&ps->lock, flags);
}
static inline void async_removepending(struct async *as)
{
struct dev_state *ps = as->ps;
unsigned long flags;
spin_lock_irqsave(&ps->lock, flags);
list_del_init(&as->asynclist);
spin_unlock_irqrestore(&ps->lock, flags);
}
static inline struct async *async_getcompleted(struct dev_state *ps)
{
unsigned long flags;
struct async *as = NULL;
spin_lock_irqsave(&ps->lock, flags);
if (!list_empty(&ps->async_completed)) {
as = list_entry(ps->async_completed.next, struct async, asynclist);
list_del_init(&as->asynclist);
}
spin_unlock_irqrestore(&ps->lock, flags);
return as;
}
static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
{
unsigned long flags;
struct async *as;
spin_lock_irqsave(&ps->lock, flags);
list_for_each_entry(as, &ps->async_pending, asynclist)
if (as->userurb == userurb) {
list_del_init(&as->asynclist);
spin_unlock_irqrestore(&ps->lock, flags);
return as;
}
spin_unlock_irqrestore(&ps->lock, flags);
return NULL;
}
static void async_completed(struct urb *urb, struct pt_regs *regs)
{
struct async *as = (struct async *)urb->context;
struct dev_state *ps = as->ps;
struct siginfo sinfo;
spin_lock(&ps->lock);
list_move_tail(&as->asynclist, &ps->async_completed);
spin_unlock(&ps->lock);
if (as->signr) {
sinfo.si_signo = as->signr;
sinfo.si_errno = as->urb->status;
sinfo.si_code = SI_ASYNCIO;
sinfo.si_addr = as->userurb;
send_sig_info(as->signr, &sinfo, as->task);
}
wake_up(&ps->wait);
}
static void destroy_async (struct dev_state *ps, struct list_head *list)
{
struct async *as;
unsigned long flags;
spin_lock_irqsave(&ps->lock, flags);
while (!list_empty(list)) {
as = list_entry(list->next, struct async, asynclist);
list_del_init(&as->asynclist);
/* drop the spinlock so the completion handler can run */
spin_unlock_irqrestore(&ps->lock, flags);
usb_kill_urb(as->urb);
spin_lock_irqsave(&ps->lock, flags);
}
spin_unlock_irqrestore(&ps->lock, flags);
as = async_getcompleted(ps);
while (as) {
free_async(as);
as = async_getcompleted(ps);
}
}
static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
{
struct list_head *p, *q, hitlist;
unsigned long flags;
INIT_LIST_HEAD(&hitlist);
spin_lock_irqsave(&ps->lock, flags);
list_for_each_safe(p, q, &ps->async_pending)
if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
list_move_tail(p, &hitlist);
spin_unlock_irqrestore(&ps->lock, flags);
destroy_async(ps, &hitlist);
}
static inline void destroy_all_async(struct dev_state *ps)
{
destroy_async(ps, &ps->async_pending);
}
/*
* interface claims are made only at the request of user level code,
* which can also release them (explicitly or by closing files).
* they're also undone when devices disconnect.
*/
static int driver_probe (struct usb_interface *intf,
const struct usb_device_id *id)
{
return -ENODEV;
}
static void driver_disconnect(struct usb_interface *intf)
{
struct dev_state *ps = usb_get_intfdata (intf);
unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
if (!ps)
return;
/* NOTE: this relies on usbcore having canceled and completed
* all pending I/O requests; 2.6 does that.
*/
if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
clear_bit(ifnum, &ps->ifclaimed);
else
warn("interface number %u out of range", ifnum);
usb_set_intfdata (intf, NULL);
/* force async requests to complete */
destroy_async_on_interface(ps, ifnum);
}
struct usb_driver usbfs_driver = {
.owner = THIS_MODULE,
.name = "usbfs",
.probe = driver_probe,
.disconnect = driver_disconnect,
};
static int claimintf(struct dev_state *ps, unsigned int ifnum)
{
struct usb_device *dev = ps->dev;
struct usb_interface *intf;
int err;
if (ifnum >= 8*sizeof(ps->ifclaimed))
return -EINVAL;
/* already claimed */
if (test_bit(ifnum, &ps->ifclaimed))
return 0;
/* lock against other changes to driver bindings */
down_write(&usb_bus_type.subsys.rwsem);
intf = usb_ifnum_to_if(dev, ifnum);
if (!intf)
err = -ENOENT;
else
err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
up_write(&usb_bus_type.subsys.rwsem);
if (err == 0)
set_bit(ifnum, &ps->ifclaimed);
return err;
}
static int releaseintf(struct dev_state *ps, unsigned int ifnum)
{
struct usb_device *dev;
struct usb_interface *intf;
int err;
err = -EINVAL;
if (ifnum >= 8*sizeof(ps->ifclaimed))
return err;
dev = ps->dev;
/* lock against other changes to driver bindings */
down_write(&usb_bus_type.subsys.rwsem);
intf = usb_ifnum_to_if(dev, ifnum);
if (!intf)
err = -ENOENT;
else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
usb_driver_release_interface(&usbfs_driver, intf);
err = 0;
}
up_write(&usb_bus_type.subsys.rwsem);
return err;
}
static int checkintf(struct dev_state *ps, unsigned int ifnum)
{
if (ps->dev->state != USB_STATE_CONFIGURED)
return -EHOSTUNREACH;
if (ifnum >= 8*sizeof(ps->ifclaimed))
return -EINVAL;
if (test_bit(ifnum, &ps->ifclaimed))
return 0;
/* if not yet claimed, claim it for the driver */
dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
current->pid, current->comm, ifnum);
return claimintf(ps, ifnum);
}
static int findintfep(struct usb_device *dev, unsigned int ep)
{
unsigned int i, j, e;
struct usb_interface *intf;
struct usb_host_interface *alts;
struct usb_endpoint_descriptor *endpt;
if (ep & ~(USB_DIR_IN|0xf))
return -EINVAL;
if (!dev->actconfig)
return -ESRCH;
for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
intf = dev->actconfig->interface[i];
for (j = 0; j < intf->num_altsetting; j++) {
alts = &intf->altsetting[j];
for (e = 0; e < alts->desc.bNumEndpoints; e++) {
endpt = &alts->endpoint[e].desc;
if (endpt->bEndpointAddress == ep)
return alts->desc.bInterfaceNumber;
}
}
}
return -ENOENT;
}
static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
{
int ret = 0;
if (ps->dev->state != USB_STATE_CONFIGURED)
return -EHOSTUNREACH;
if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
return 0;
index &= 0xff;
switch (requesttype & USB_RECIP_MASK) {
case USB_RECIP_ENDPOINT:
if ((ret = findintfep(ps->dev, index)) >= 0)
ret = checkintf(ps, ret);
break;
case USB_RECIP_INTERFACE:
ret = checkintf(ps, index);
break;
}
return ret;
}
/*
* file operations
*/
static int usbdev_open(struct inode *inode, struct file *file)
{
struct usb_device *dev;
struct dev_state *ps;
int ret;
/*
* no locking necessary here, as chrdev_open has the kernel lock
* (still acquire the kernel lock for safety)
*/
ret = -ENOMEM;
if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
goto out_nolock;
lock_kernel();
ret = -ENOENT;
dev = usb_get_dev(inode->u.generic_ip);
if (!dev) {
kfree(ps);
goto out;
}
ret = 0;
ps->dev = dev;
ps->file = file;
spin_lock_init(&ps->lock);
INIT_LIST_HEAD(&ps->async_pending);
INIT_LIST_HEAD(&ps->async_completed);
init_waitqueue_head(&ps->wait);
ps->discsignr = 0;
ps->disctask = current;
ps->disccontext = NULL;
ps->ifclaimed = 0;
wmb();
list_add_tail(&ps->list, &dev->filelist);
file->private_data = ps;
out:
unlock_kernel();
out_nolock:
return ret;
}
static int usbdev_release(struct inode *inode, struct file *file)
{
struct dev_state *ps = (struct dev_state *)file->private_data;
struct usb_device *dev = ps->dev;
unsigned int ifnum;
usb_lock_device(dev);
list_del_init(&ps->list);
for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
ifnum++) {
if (test_bit(ifnum, &ps->ifclaimed))
releaseintf(ps, ifnum);
}
destroy_all_async(ps);
usb_unlock_device(dev);
usb_put_dev(dev);
ps->dev = NULL;
kfree(ps);
return 0;
}
static int proc_control(struct dev_state *ps, void __user *arg)
{
struct usb_device *dev = ps->dev;
struct usbdevfs_ctrltransfer ctrl;
unsigned int tmo;
unsigned char *tbuf;
int i, j, ret;
if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
return -EFAULT;
if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
return ret;
if (ctrl.wLength > PAGE_SIZE)
return -EINVAL;
if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
return -ENOMEM;
tmo = ctrl.timeout;
if (ctrl.bRequestType & 0x80) {
if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
free_page((unsigned long)tbuf);
return -EINVAL;
}
snoop(&dev->dev, "control read: bRequest=%02x bRrequestType=%02x wValue=%04x wIndex=%04x\n",
ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, ctrl.wIndex);
usb_unlock_device(dev);
i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
usb_lock_device(dev);
if ((i > 0) && ctrl.wLength) {
if (usbfs_snoop) {
dev_info(&dev->dev, "control read: data ");
for (j = 0; j < ctrl.wLength; ++j)
printk ("%02x ", (unsigned char)(tbuf)[j]);
printk("\n");
}
if (copy_to_user(ctrl.data, tbuf, ctrl.wLength)) {
free_page((unsigned long)tbuf);
return -EFAULT;
}
}
} else {
if (ctrl.wLength) {
if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
free_page((unsigned long)tbuf);
return -EFAULT;
}
}
snoop(&dev->dev, "control write: bRequest=%02x bRrequestType=%02x wValue=%04x wIndex=%04x\n",
ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, ctrl.wIndex);
if (usbfs_snoop) {
dev_info(&dev->dev, "control write: data: ");
for (j = 0; j < ctrl.wLength; ++j)
printk ("%02x ", (unsigned char)(tbuf)[j]);
printk("\n");
}
usb_unlock_device(dev);
i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
usb_lock_device(dev);
}
free_page((unsigned long)tbuf);
if (i<0 && i != -EPIPE) {
dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
"failed cmd %s rqt %u rq %u len %u ret %d\n",
current->comm, ctrl.bRequestType, ctrl.bRequest,
ctrl.wLength, i);
}
return i;
}
static int proc_bulk(struct dev_state *ps, void __user *arg)
{
struct usb_device *dev = ps->dev;
struct usbdevfs_bulktransfer bulk;
unsigned int tmo, len1, pipe;
int len2;
unsigned char *tbuf;
int i, ret;
if (copy_from_user(&bulk, arg, sizeof(bulk)))
return -EFAULT;
if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
return ret;
if ((ret = checkintf(ps, ret)))
return ret;
if (bulk.ep & USB_DIR_IN)
pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
else
pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
return -EINVAL;
len1 = bulk.len;
if (len1 > MAX_USBFS_BUFFER_SIZE)
return -EINVAL;
if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
return -ENOMEM;
tmo = bulk.timeout;
if (bulk.ep & 0x80) {
if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
kfree(tbuf);
return -EINVAL;
}
usb_unlock_device(dev);
i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
usb_lock_device(dev);
if (!i && len2) {
if (copy_to_user(bulk.data, tbuf, len2)) {
kfree(tbuf);
return -EFAULT;
}
}
} else {
if (len1) {
if (copy_from_user(tbuf, bulk.data, len1)) {
kfree(tbuf);
return -EFAULT;
}
}
usb_unlock_device(dev);
i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
usb_lock_device(dev);
}
kfree(tbuf);
if (i < 0)
return i;
return len2;
}
static int proc_resetep(struct dev_state *ps, void __user *arg)
{
unsigned int ep;
int ret;
if (get_user(ep, (unsigned int __user *)arg))
return -EFAULT;
if ((ret = findintfep(ps->dev, ep)) < 0)
return ret;
if ((ret = checkintf(ps, ret)))
return ret;
usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
return 0;
}
static int proc_clearhalt(struct dev_state *ps, void __user *arg)
{
unsigned int ep;
int pipe;
int ret;
if (get_user(ep, (unsigned int __user *)arg))
return -EFAULT;
if ((ret = findintfep(ps->dev, ep)) < 0)
return ret;
if ((ret = checkintf(ps, ret)))
return ret;
if (ep & USB_DIR_IN)
pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
else
pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
return usb_clear_halt(ps->dev, pipe);
}
static int proc_getdriver(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_getdriver gd;
struct usb_interface *intf;
int ret;
if (copy_from_user(&gd, arg, sizeof(gd)))
return -EFAULT;
down_read(&usb_bus_type.subsys.rwsem);
intf = usb_ifnum_to_if(ps->dev, gd.interface);
if (!intf || !intf->dev.driver)
ret = -ENODATA;
else {
strncpy(gd.driver, intf->dev.driver->name,
sizeof(gd.driver));
ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
}
up_read(&usb_bus_type.subsys.rwsem);
return ret;
}
static int proc_connectinfo(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_connectinfo ci;
ci.devnum = ps->dev->devnum;
ci.slow = ps->dev->speed == USB_SPEED_LOW;
if (copy_to_user(arg, &ci, sizeof(ci)))
return -EFAULT;
return 0;
}
static int proc_resetdevice(struct dev_state *ps)
{
return usb_reset_device(ps->dev);
}
static int proc_setintf(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_setinterface setintf;
int ret;
if (copy_from_user(&setintf, arg, sizeof(setintf)))
return -EFAULT;
if ((ret = checkintf(ps, setintf.interface)))
return ret;
return usb_set_interface(ps->dev, setintf.interface,
setintf.altsetting);
}
static int proc_setconfig(struct dev_state *ps, void __user *arg)
{
unsigned int u;
int status = 0;
struct usb_host_config *actconfig;
if (get_user(u, (unsigned int __user *)arg))
return -EFAULT;
actconfig = ps->dev->actconfig;
/* Don't touch the device if any interfaces are claimed.
* It could interfere with other drivers' operations, and if
* an interface is claimed by usbfs it could easily deadlock.
*/
if (actconfig) {
int i;
for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
if (usb_interface_claimed(actconfig->interface[i])) {
dev_warn (&ps->dev->dev,
"usbfs: interface %d claimed by %s "
"while '%s' sets config #%d\n",
actconfig->interface[i]
->cur_altsetting
->desc.bInterfaceNumber,
actconfig->interface[i]
->dev.driver->name,
current->comm, u);
status = -EBUSY;
break;
}
}
}
/* SET_CONFIGURATION is often abused as a "cheap" driver reset,
* so avoid usb_set_configuration()'s kick to sysfs
*/
if (status == 0) {
if (actconfig && actconfig->desc.bConfigurationValue == u)
status = usb_reset_configuration(ps->dev);
else
status = usb_set_configuration(ps->dev, u);
}
return status;
}
static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
void __user *arg)
{
struct usbdevfs_iso_packet_desc *isopkt = NULL;
struct usb_host_endpoint *ep;
struct async *as;
struct usb_ctrlrequest *dr = NULL;
unsigned int u, totlen, isofrmlen;
int ret, interval = 0, ifnum = -1;
if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
URB_NO_FSBR|URB_ZERO_PACKET))
return -EINVAL;
if (!uurb->buffer)
return -EINVAL;
if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
return -EINVAL;
if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
return ifnum;
if ((ret = checkintf(ps, ifnum)))
return ret;
}
if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
else
ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
if (!ep)
return -ENOENT;
switch(uurb->type) {
case USBDEVFS_URB_TYPE_CONTROL:
if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
!= USB_ENDPOINT_XFER_CONTROL)
return -EINVAL;
/* min 8 byte setup packet, max arbitrary */
if (uurb->buffer_length < 8 || uurb->buffer_length > PAGE_SIZE)
return -EINVAL;
if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
return -ENOMEM;
if (copy_from_user(dr, uurb->buffer, 8)) {
kfree(dr);
return -EFAULT;
}
if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
kfree(dr);
return -EINVAL;
}
if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
kfree(dr);
return ret;
}
uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
uurb->number_of_packets = 0;
uurb->buffer_length = le16_to_cpup(&dr->wLength);
uurb->buffer += 8;
if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
kfree(dr);
return -EFAULT;
}
break;
case USBDEVFS_URB_TYPE_BULK:
switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
case USB_ENDPOINT_XFER_CONTROL:
case USB_ENDPOINT_XFER_ISOC:
return -EINVAL;
/* allow single-shot interrupt transfers, at bogus rates */
}
uurb->number_of_packets = 0;
if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
return -EINVAL;
if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
return -EFAULT;
break;
case USBDEVFS_URB_TYPE_ISO:
/* arbitrary limit */
if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
return -EINVAL;
if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
!= USB_ENDPOINT_XFER_ISOC)
return -EINVAL;
interval = 1 << min (15, ep->desc.bInterval - 1);
isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
return -ENOMEM;
if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
kfree(isopkt);
return -EFAULT;
}
for (totlen = u = 0; u < uurb->number_of_packets; u++) {
if (isopkt[u].length > 1023) {
kfree(isopkt);
return -EINVAL;
}
totlen += isopkt[u].length;
}
if (totlen > 32768) {
kfree(isopkt);
return -EINVAL;
}
uurb->buffer_length = totlen;
break;
case USBDEVFS_URB_TYPE_INTERRUPT:
uurb->number_of_packets = 0;
if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
!= USB_ENDPOINT_XFER_INT)
return -EINVAL;
if (ps->dev->speed == USB_SPEED_HIGH)
interval = 1 << min (15, ep->desc.bInterval - 1);
else
interval = ep->desc.bInterval;
if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
return -EINVAL;
if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
return -EFAULT;
break;
default:
return -EINVAL;
}
if (!(as = alloc_async(uurb->number_of_packets))) {
kfree(isopkt);
kfree(dr);
return -ENOMEM;
}
if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
kfree(isopkt);
kfree(dr);
free_async(as);
return -ENOMEM;
}
as->urb->dev = ps->dev;
as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
as->urb->transfer_flags = uurb->flags;
as->urb->transfer_buffer_length = uurb->buffer_length;
as->urb->setup_packet = (unsigned char*)dr;
as->urb->start_frame = uurb->start_frame;
as->urb->number_of_packets = uurb->number_of_packets;
as->urb->interval = interval;
as->urb->context = as;
as->urb->complete = async_completed;
for (totlen = u = 0; u < uurb->number_of_packets; u++) {
as->urb->iso_frame_desc[u].offset = totlen;
as->urb->iso_frame_desc[u].length = isopkt[u].length;
totlen += isopkt[u].length;
}
kfree(isopkt);
as->ps = ps;
as->userurb = arg;
if (uurb->endpoint & USB_DIR_IN)
as->userbuffer = uurb->buffer;
else
as->userbuffer = NULL;
as->signr = uurb->signr;
as->ifnum = ifnum;
as->task = current;
if (!(uurb->endpoint & USB_DIR_IN)) {
if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
free_async(as);
return -EFAULT;
}
}
async_newpending(as);
if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
async_removepending(as);
free_async(as);
return ret;
}
return 0;
}
static int proc_submiturb(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_urb uurb;
if (copy_from_user(&uurb, arg, sizeof(uurb)))
return -EFAULT;
return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
}
static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
{
struct async *as;
as = async_getpending(ps, arg);
if (!as)
return -EINVAL;
usb_kill_urb(as->urb);
return 0;
}
static int processcompl(struct async *as, void __user * __user *arg)
{
struct urb *urb = as->urb;
struct usbdevfs_urb __user *userurb = as->userurb;
void __user *addr = as->userurb;
unsigned int i;
if (as->userbuffer)
if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
return -EFAULT;
if (put_user(urb->status, &userurb->status))
return -EFAULT;
if (put_user(urb->actual_length, &userurb->actual_length))
return -EFAULT;
if (put_user(urb->error_count, &userurb->error_count))
return -EFAULT;
if (usb_pipeisoc(urb->pipe)) {
for (i = 0; i < urb->number_of_packets; i++) {
if (put_user(urb->iso_frame_desc[i].actual_length,
&userurb->iso_frame_desc[i].actual_length))
return -EFAULT;
if (put_user(urb->iso_frame_desc[i].status,
&userurb->iso_frame_desc[i].status))
return -EFAULT;
}
}
free_async(as);
if (put_user(addr, (void __user * __user *)arg))
return -EFAULT;
return 0;
}
static struct async* reap_as(struct dev_state *ps)
{
DECLARE_WAITQUEUE(wait, current);
struct async *as = NULL;
struct usb_device *dev = ps->dev;
add_wait_queue(&ps->wait, &wait);
for (;;) {
__set_current_state(TASK_INTERRUPTIBLE);
if ((as = async_getcompleted(ps)))
break;
if (signal_pending(current))
break;
usb_unlock_device(dev);
schedule();
usb_lock_device(dev);
}
remove_wait_queue(&ps->wait, &wait);
set_current_state(TASK_RUNNING);
return as;
}
static int proc_reapurb(struct dev_state *ps, void __user *arg)
{
struct async *as = reap_as(ps);
if (as)
return processcompl(as, (void __user * __user *)arg);
if (signal_pending(current))
return -EINTR;
return -EIO;
}
static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
{
struct async *as;
if (!(as = async_getcompleted(ps)))
return -EAGAIN;
return processcompl(as, (void __user * __user *)arg);
}
#ifdef CONFIG_COMPAT
static int get_urb32(struct usbdevfs_urb *kurb,
struct usbdevfs_urb32 __user *uurb)
{
__u32 uptr;
if (get_user(kurb->type, &uurb->type) ||
__get_user(kurb->endpoint, &uurb->endpoint) ||
__get_user(kurb->status, &uurb->status) ||
__get_user(kurb->flags, &uurb->flags) ||
__get_user(kurb->buffer_length, &uurb->buffer_length) ||
__get_user(kurb->actual_length, &uurb->actual_length) ||
__get_user(kurb->start_frame, &uurb->start_frame) ||
__get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
__get_user(kurb->error_count, &uurb->error_count) ||
__get_user(kurb->signr, &uurb->signr))
return -EFAULT;
if (__get_user(uptr, &uurb->buffer))
return -EFAULT;
kurb->buffer = compat_ptr(uptr);
if (__get_user(uptr, &uurb->buffer))
return -EFAULT;
kurb->usercontext = compat_ptr(uptr);
return 0;
}
static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_urb uurb;
if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
return -EFAULT;
return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
}
static int processcompl_compat(struct async *as, void __user * __user *arg)
{
struct urb *urb = as->urb;
struct usbdevfs_urb32 __user *userurb = as->userurb;
void __user *addr = as->userurb;
unsigned int i;
if (as->userbuffer)
if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
return -EFAULT;
if (put_user(urb->status, &userurb->status))
return -EFAULT;
if (put_user(urb->actual_length, &userurb->actual_length))
return -EFAULT;
if (put_user(urb->error_count, &userurb->error_count))
return -EFAULT;
if (usb_pipeisoc(urb->pipe)) {
for (i = 0; i < urb->number_of_packets; i++) {
if (put_user(urb->iso_frame_desc[i].actual_length,
&userurb->iso_frame_desc[i].actual_length))
return -EFAULT;
if (put_user(urb->iso_frame_desc[i].status,
&userurb->iso_frame_desc[i].status))
return -EFAULT;
}
}
free_async(as);
if (put_user((u32)(u64)addr, (u32 __user *)arg))
return -EFAULT;
return 0;
}
static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
{
struct async *as = reap_as(ps);
if (as)
return processcompl_compat(as, (void __user * __user *)arg);
if (signal_pending(current))
return -EINTR;
return -EIO;
}
static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
{
struct async *as;
if (!(as = async_getcompleted(ps)))
return -EAGAIN;
return processcompl_compat(as, (void __user * __user *)arg);
}
#endif
static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_disconnectsignal ds;
if (copy_from_user(&ds, arg, sizeof(ds)))
return -EFAULT;
if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
return -EINVAL;
ps->discsignr = ds.signr;
ps->disccontext = ds.context;
return 0;
}
static int proc_claiminterface(struct dev_state *ps, void __user *arg)
{
unsigned int ifnum;
if (get_user(ifnum, (unsigned int __user *)arg))
return -EFAULT;
return claimintf(ps, ifnum);
}
static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
{
unsigned int ifnum;
int ret;
if (get_user(ifnum, (unsigned int __user *)arg))
return -EFAULT;
if ((ret = releaseintf(ps, ifnum)) < 0)
return ret;
destroy_async_on_interface (ps, ifnum);
return 0;
}
static int proc_ioctl (struct dev_state *ps, void __user *arg)
{
struct usbdevfs_ioctl ctrl;
int size;
void *buf = NULL;
int retval = 0;
struct usb_interface *intf = NULL;
struct usb_driver *driver = NULL;
int i;
/* get input parameters and alloc buffer */
if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
return -EFAULT;
if ((size = _IOC_SIZE (ctrl.ioctl_code)) > 0) {
if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
return -ENOMEM;
if ((_IOC_DIR(ctrl.ioctl_code) & _IOC_WRITE)) {
if (copy_from_user (buf, ctrl.data, size)) {
kfree(buf);
return -EFAULT;
}
} else {
memset (buf, 0, size);
}
}
if (!connected(ps->dev)) {
kfree(buf);
return -ENODEV;
}
if (ps->dev->state != USB_STATE_CONFIGURED)
retval = -EHOSTUNREACH;
else if (!(intf = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
retval = -EINVAL;
else switch (ctrl.ioctl_code) {
/* disconnect kernel driver from interface */
case USBDEVFS_DISCONNECT:
/* don't allow the user to unbind the hub driver from
* a hub with children to manage */
for (i = 0; i < ps->dev->maxchild; ++i) {
if (ps->dev->children[i])
retval = -EBUSY;
}
if (retval)
break;
down_write(&usb_bus_type.subsys.rwsem);
if (intf->dev.driver) {
driver = to_usb_driver(intf->dev.driver);
dev_dbg (&intf->dev, "disconnect by usbfs\n");
usb_driver_release_interface(driver, intf);
} else
retval = -ENODATA;
up_write(&usb_bus_type.subsys.rwsem);
break;
/* let kernel drivers try to (re)bind to the interface */
case USBDEVFS_CONNECT:
usb_unlock_device(ps->dev);
usb_lock_all_devices();
bus_rescan_devices(intf->dev.bus);
usb_unlock_all_devices();
usb_lock_device(ps->dev);
break;
/* talk directly to the interface's driver */
default:
down_read(&usb_bus_type.subsys.rwsem);
if (intf->dev.driver)
driver = to_usb_driver(intf->dev.driver);
if (driver == NULL || driver->ioctl == NULL) {
retval = -ENOTTY;
} else {
retval = driver->ioctl (intf, ctrl.ioctl_code, buf);
if (retval == -ENOIOCTLCMD)
retval = -ENOTTY;
}
up_read(&usb_bus_type.subsys.rwsem);
}
/* cleanup and return */
if (retval >= 0
&& (_IOC_DIR (ctrl.ioctl_code) & _IOC_READ) != 0
&& size > 0
&& copy_to_user (ctrl.data, buf, size) != 0)
retval = -EFAULT;
kfree(buf);
return retval;
}
/*
* NOTE: All requests here that have interface numbers as parameters
* are assuming that somehow the configuration has been prevented from
* changing. But there's no mechanism to ensure that...
*/
static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
struct dev_state *ps = (struct dev_state *)file->private_data;
struct usb_device *dev = ps->dev;
void __user *p = (void __user *)arg;
int ret = -ENOTTY;
if (!(file->f_mode & FMODE_WRITE))
return -EPERM;
usb_lock_device(dev);
if (!connected(dev)) {
usb_unlock_device(dev);
return -ENODEV;
}
switch (cmd) {
case USBDEVFS_CONTROL:
snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
ret = proc_control(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_BULK:
snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
ret = proc_bulk(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_RESETEP:
snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
ret = proc_resetep(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_RESET:
snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
ret = proc_resetdevice(ps);
break;
case USBDEVFS_CLEAR_HALT:
snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
ret = proc_clearhalt(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_GETDRIVER:
snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
ret = proc_getdriver(ps, p);
break;
case USBDEVFS_CONNECTINFO:
snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
ret = proc_connectinfo(ps, p);
break;
case USBDEVFS_SETINTERFACE:
snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
ret = proc_setintf(ps, p);
break;
case USBDEVFS_SETCONFIGURATION:
snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
ret = proc_setconfig(ps, p);
break;
case USBDEVFS_SUBMITURB:
snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
ret = proc_submiturb(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
#ifdef CONFIG_COMPAT
case USBDEVFS_SUBMITURB32:
snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
ret = proc_submiturb_compat(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_REAPURB32:
snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
ret = proc_reapurb_compat(ps, p);
break;
case USBDEVFS_REAPURBNDELAY32:
snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
ret = proc_reapurbnonblock_compat(ps, p);
break;
#endif
case USBDEVFS_DISCARDURB:
snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
ret = proc_unlinkurb(ps, p);
break;
case USBDEVFS_REAPURB:
snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
ret = proc_reapurb(ps, p);
break;
case USBDEVFS_REAPURBNDELAY:
snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
ret = proc_reapurbnonblock(ps, p);
break;
case USBDEVFS_DISCSIGNAL:
snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
ret = proc_disconnectsignal(ps, p);
break;
case USBDEVFS_CLAIMINTERFACE:
snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
ret = proc_claiminterface(ps, p);
break;
case USBDEVFS_RELEASEINTERFACE:
snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
ret = proc_releaseinterface(ps, p);
break;
case USBDEVFS_IOCTL:
snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
ret = proc_ioctl(ps, p);
break;
}
usb_unlock_device(dev);
if (ret >= 0)
inode->i_atime = CURRENT_TIME;
return ret;
}
/* No kernel lock - fine */
static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
{
struct dev_state *ps = (struct dev_state *)file->private_data;
unsigned int mask = 0;
poll_wait(file, &ps->wait, wait);
if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
mask |= POLLOUT | POLLWRNORM;
if (!connected(ps->dev))
mask |= POLLERR | POLLHUP;
return mask;
}
struct file_operations usbfs_device_file_operations = {
.llseek = usbdev_lseek,
.read = usbdev_read,
.poll = usbdev_poll,
.ioctl = usbdev_ioctl,
.open = usbdev_open,
.release = usbdev_release,
};
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