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authorOliver Neukum <oliver@neukum.org>2010-02-27 20:56:22 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2010-03-19 07:24:16 -0700
commit62e6685470fb04fb7688ecef96c39160498721d5 (patch)
tree2350c3c979dad7cbc73a7edbc22e9bfef188a867 /drivers/usb/class
parentbeb1d35f1690fe27694472a010a8e4a9ae11cc50 (diff)
usb: cdc-wdm:Fix loss of data due to autosuspend
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>
Diffstat (limited to 'drivers/usb/class')
-rw-r--r--drivers/usb/class/cdc-wdm.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index a6b5e9fd071..07c12974fe1 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -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;
}