From: Oliver Neukum <oliver@neukum.org>
Date: Sat, 27 Feb 2010 19:57:12 +0000 (+0100)
Subject: usb: cdc-wdm: Fix deadlock between write and resume
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=338124c1f18c2c737656ac58735f040d90b23d8c;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

usb: cdc-wdm: Fix deadlock between write and resume

The new runtime PM scheme allows resume() to have no locks.
This fixes the deadlock.

Signed-off-by: Oliver Neukum <neukum@b1-systems.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index b57490508860..189141ca4e05 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -839,10 +839,10 @@ static int wdm_resume(struct usb_interface *intf)
 	int rv;
 
 	dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor);
-	mutex_lock(&desc->lock);
+
 	clear_bit(WDM_SUSPENDING, &desc->flags);
 	rv = recover_from_urb_loss(desc);
-	mutex_unlock(&desc->lock);
+
 	return rv;
 }
 #endif