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usb: cdc-wdm: Fix order in disconnect and fix locking

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- as the callback can schedule work, URBs must be killed first
- if the driver causes an autoresume, the caller must handle locking

Signed-off-by: Oliver Neukum <neukum@b1-systems.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2010-02-27 20:56:47 +01:00 committed by Greg Kroah-Hartman
parent 62e6685470
commit d93d16e9aa
1 changed files with 17 additions and 8 deletions
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25
drivers/usb/class/cdc-wdm.c
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@ -776,9 +776,9 @@ static void wdm_disconnect(struct usb_interface *intf)
/* to terminate pending flushes */
clear_bit(WDM_IN_USE, &desc->flags);
spin_unlock_irqrestore(&desc->iuspin, flags);
cancel_work_sync(&desc->rxwork);
mutex_lock(&desc->lock);
kill_urbs(desc);
cancel_work_sync(&desc->rxwork);
mutex_unlock(&desc->lock);
wake_up_all(&desc->wait);
if (!desc->count)
@ -786,6 +786,7 @@ static void wdm_disconnect(struct usb_interface *intf)
mutex_unlock(&wdm_mutex);
}
#ifdef CONFIG_PM
static int wdm_suspend(struct usb_interface *intf, pm_message_t message)
{
struct wdm_device *desc = usb_get_intfdata(intf);
@ -793,27 +794,30 @@ static int wdm_suspend(struct usb_interface *intf, pm_message_t message)
dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor);
mutex_lock(&desc->lock);
/* if this is an autosuspend the caller does the locking */
if (!(message.event & PM_EVENT_AUTO))
mutex_lock(&desc->lock);
spin_lock_irq(&desc->iuspin);
#ifdef CONFIG_PM
if ((message.event & PM_EVENT_AUTO) &&
(test_bit(WDM_IN_USE, &desc->flags)
|| test_bit(WDM_RESPONDING, &desc->flags))) {
spin_unlock_irq(&desc->iuspin);
rv = -EBUSY;
} else {
#endif
set_bit(WDM_SUSPENDING, &desc->flags);
spin_unlock_irq(&desc->iuspin);
cancel_work_sync(&desc->rxwork);
/* callback submits work - order is essential */
kill_urbs(desc);
#ifdef CONFIG_PM
cancel_work_sync(&desc->rxwork);
}
#endif
mutex_unlock(&desc->lock);
if (!(message.event & PM_EVENT_AUTO))
mutex_unlock(&desc->lock);
return rv;
}
#endif
static int recover_from_urb_loss(struct wdm_device *desc)
{
@ -827,6 +831,8 @@ static int recover_from_urb_loss(struct wdm_device *desc)
}
return rv;
}
#ifdef CONFIG_PM
static int wdm_resume(struct usb_interface *intf)
{
struct wdm_device *desc = usb_get_intfdata(intf);
@ -839,6 +845,7 @@ static int wdm_resume(struct usb_interface *intf)
mutex_unlock(&desc->lock);
return rv;
}
#endif
static int wdm_pre_reset(struct usb_interface *intf)
{
@ -862,9 +869,11 @@ static struct usb_driver wdm_driver = {
.name = "cdc_wdm",
.probe = wdm_probe,
.disconnect = wdm_disconnect,
#ifdef CONFIG_PM
.suspend = wdm_suspend,
.resume = wdm_resume,
.reset_resume = wdm_resume,
#endif
.pre_reset = wdm_pre_reset,
.post_reset = wdm_post_reset,
.id_table = wdm_ids,