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usb: cdc-wdm:Fix loss of data due to autosuspend

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The guarding flag must be set and tested under spinlock
and cleared before the URBs are resubmitted in resume.

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 20:56:22 +01:00 committed by Greg Kroah-Hartman
parent beb1d35f16
commit 62e6685470
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/class/cdc-wdm.c
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@ -794,14 +794,17 @@ 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);
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);
kill_urbs(desc);
#ifdef CONFIG_PM
@ -831,8 +834,8 @@ static int wdm_resume(struct usb_interface *intf)
dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor);
mutex_lock(&desc->lock);
rv = recover_from_urb_loss(desc);
clear_bit(WDM_SUSPENDING, &desc->flags);
rv = recover_from_urb_loss(desc);
mutex_unlock(&desc->lock);
return rv;
}