>From ef28b7584dd90806d69d45fec0192f50abb22ca9 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oliver@xxxxxxxxxx>
Date: Sat, 27 Feb 2010 20:40:24 +0100
Subject: [PATCH 5/7] 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@xxxxxxxxxxxxx>
---
drivers/usb/class/cdc-wdm.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index d7dcf41..710a5b2 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;
}
--
1.6.4.2
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