M7350/external/compat-wireless/compat/compat-2.6.36.c
2024-09-09 08:57:42 +00:00

111 lines
2.9 KiB
C

/*
* Copyright 2010 Hauke Mehrtens <hauke@hauke-m.de>
*
* 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.
*
* Compatibility file for Linux wireless for kernels 2.6.36.
*/
#include <linux/compat.h>
#include <linux/usb.h>
#ifdef CONFIG_COMPAT_USB_URB_THREAD_FIX
/* Callers must hold anchor->lock */
static void __usb_unanchor_urb(struct urb *urb, struct usb_anchor *anchor)
{
urb->anchor = NULL;
list_del(&urb->anchor_list);
usb_put_urb(urb);
if (list_empty(&anchor->urb_list))
wake_up(&anchor->wait);
}
/**
* usb_unlink_anchored_urbs - asynchronously cancel transfer requests en masse
* @anchor: anchor the requests are bound to
*
* this allows all outstanding URBs to be unlinked starting
* from the back of the queue. This function is asynchronous.
* The unlinking is just tiggered. It may happen after this
* function has returned.
*
* This routine should not be called by a driver after its disconnect
* method has returned.
*/
void compat_usb_unlink_anchored_urbs(struct usb_anchor *anchor)
{
struct urb *victim;
while ((victim = usb_get_from_anchor(anchor)) != NULL) {
usb_unlink_urb(victim);
usb_put_urb(victim);
}
}
EXPORT_SYMBOL_GPL(compat_usb_unlink_anchored_urbs);
/**
* usb_get_from_anchor - get an anchor's oldest urb
* @anchor: the anchor whose urb you want
*
* this will take the oldest urb from an anchor,
* unanchor and return it
*/
struct urb *compat_usb_get_from_anchor(struct usb_anchor *anchor)
{
struct urb *victim;
unsigned long flags;
spin_lock_irqsave(&anchor->lock, flags);
if (!list_empty(&anchor->urb_list)) {
victim = list_entry(anchor->urb_list.next, struct urb,
anchor_list);
usb_get_urb(victim);
__usb_unanchor_urb(victim, anchor);
} else {
victim = NULL;
}
spin_unlock_irqrestore(&anchor->lock, flags);
return victim;
}
EXPORT_SYMBOL_GPL(compat_usb_get_from_anchor);
/**
* usb_scuttle_anchored_urbs - unanchor all an anchor's urbs
* @anchor: the anchor whose urbs you want to unanchor
*
* use this to get rid of all an anchor's urbs
*/
void compat_usb_scuttle_anchored_urbs(struct usb_anchor *anchor)
{
struct urb *victim;
unsigned long flags;
spin_lock_irqsave(&anchor->lock, flags);
while (!list_empty(&anchor->urb_list)) {
victim = list_entry(anchor->urb_list.prev, struct urb,
anchor_list);
__usb_unanchor_urb(victim, anchor);
}
spin_unlock_irqrestore(&anchor->lock, flags);
}
EXPORT_SYMBOL_GPL(compat_usb_scuttle_anchored_urbs);
#endif /* CONFIG_COMPAT_USB_URB_THREAD_FIX */
struct workqueue_struct *system_nrt_wq __read_mostly;
EXPORT_SYMBOL_GPL(system_nrt_wq);
void compat_system_workqueue_create()
{
system_nrt_wq = create_singlethread_workqueue("events_nrt");
WARN_ON(!system_nrt_wq);
}
void compat_system_workqueue_destroy()
{
destroy_workqueue(system_nrt_wq);
}