From: Oliver Neukum <oliver@neukum.org>
Date: Mon, 30 Apr 2012 07:13:46 +0000 (+0200)
Subject: usbhid: prevent deadlock during timeout
X-Git-Tag: v3.5-rc1~149^2~256
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8815bb09af21316aeb5f8948b24ac62181670db2;p=pandora-kernel.git

usbhid: prevent deadlock during timeout

On some HCDs usb_unlink_urb() can directly call the
completion handler. That limits the spinlocks that can
be taken in the handler to locks not held while calling
usb_unlink_urb()
To prevent a race with resubmission, this patch exposes
usbcore's infrastructure for blocking submission, uses it
and so drops the lock without causing a race in usbhid.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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