mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 10:26:39 +07:00
600856c231
The USB core doesn't properly handle mutual exclusion between resetting a hub and changing the power states of the hub's ports. We need to avoid sending port-power requests to the hub while it is being reset, because such requests cannot succeed. This patch fixes the problem by keeping track of when a reset is in progress. At such times, attempts to suspend (power-off) a port will fail immediately with -EBUSY, and calls to usb_port_runtime_resume() will update the power_is_on flag and return immediately. When the reset is complete, hub_activate() will automatically restore each port to the proper power state. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
/*
|
|
* usb hub driver head file
|
|
*
|
|
* Copyright (C) 1999 Linus Torvalds
|
|
* Copyright (C) 1999 Johannes Erdfelt
|
|
* Copyright (C) 1999 Gregory P. Smith
|
|
* Copyright (C) 2001 Brad Hards (bhards@bigpond.net.au)
|
|
* Copyright (C) 2012 Intel Corp (tianyu.lan@intel.com)
|
|
*
|
|
* move struct usb_hub to this file.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/ch11.h>
|
|
#include <linux/usb/hcd.h>
|
|
#include "usb.h"
|
|
|
|
struct usb_hub {
|
|
struct device *intfdev; /* the "interface" device */
|
|
struct usb_device *hdev;
|
|
struct kref kref;
|
|
struct urb *urb; /* for interrupt polling pipe */
|
|
|
|
/* buffer for urb ... with extra space in case of babble */
|
|
u8 (*buffer)[8];
|
|
union {
|
|
struct usb_hub_status hub;
|
|
struct usb_port_status port;
|
|
} *status; /* buffer for status reports */
|
|
struct mutex status_mutex; /* for the status buffer */
|
|
|
|
int error; /* last reported error */
|
|
int nerrors; /* track consecutive errors */
|
|
|
|
struct list_head event_list; /* hubs w/data or errs ready */
|
|
unsigned long event_bits[1]; /* status change bitmask */
|
|
unsigned long change_bits[1]; /* ports with logical connect
|
|
status change */
|
|
unsigned long busy_bits[1]; /* ports being reset or
|
|
resumed */
|
|
unsigned long removed_bits[1]; /* ports with a "removed"
|
|
device present */
|
|
unsigned long wakeup_bits[1]; /* ports that have signaled
|
|
remote wakeup */
|
|
#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
|
|
#error event_bits[] is too short!
|
|
#endif
|
|
|
|
struct usb_hub_descriptor *descriptor; /* class descriptor */
|
|
struct usb_tt tt; /* Transaction Translator */
|
|
|
|
unsigned mA_per_port; /* current for each child */
|
|
#ifdef CONFIG_PM
|
|
unsigned wakeup_enabled_descendants;
|
|
#endif
|
|
|
|
unsigned limited_power:1;
|
|
unsigned quiescing:1;
|
|
unsigned disconnected:1;
|
|
unsigned in_reset:1;
|
|
|
|
unsigned quirk_check_port_auto_suspend:1;
|
|
|
|
unsigned has_indicators:1;
|
|
u8 indicator[USB_MAXCHILDREN];
|
|
struct delayed_work leds;
|
|
struct delayed_work init_work;
|
|
struct usb_port **ports;
|
|
};
|
|
|
|
/**
|
|
* struct usb port - kernel's representation of a usb port
|
|
* @child: usb device attached to the port
|
|
* @dev: generic device interface
|
|
* @port_owner: port's owner
|
|
* @connect_type: port's connect type
|
|
* @portnum: port index num based one
|
|
* @power_is_on: port's power state
|
|
* @did_runtime_put: port has done pm_runtime_put().
|
|
*/
|
|
struct usb_port {
|
|
struct usb_device *child;
|
|
struct device dev;
|
|
struct usb_dev_state *port_owner;
|
|
enum usb_port_connect_type connect_type;
|
|
u8 portnum;
|
|
unsigned power_is_on:1;
|
|
unsigned did_runtime_put:1;
|
|
};
|
|
|
|
#define to_usb_port(_dev) \
|
|
container_of(_dev, struct usb_port, dev)
|
|
|
|
extern int usb_hub_create_port_device(struct usb_hub *hub,
|
|
int port1);
|
|
extern void usb_hub_remove_port_device(struct usb_hub *hub,
|
|
int port1);
|
|
extern int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
|
|
int port1, bool set);
|
|
extern struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev);
|
|
extern int hub_port_debounce(struct usb_hub *hub, int port1,
|
|
bool must_be_connected);
|
|
extern int usb_clear_port_feature(struct usb_device *hdev,
|
|
int port1, int feature);
|
|
|
|
static inline int hub_port_debounce_be_connected(struct usb_hub *hub,
|
|
int port1)
|
|
{
|
|
return hub_port_debounce(hub, port1, true);
|
|
}
|
|
|
|
static inline int hub_port_debounce_be_stable(struct usb_hub *hub,
|
|
int port1)
|
|
{
|
|
return hub_port_debounce(hub, port1, false);
|
|
}
|
|
|