linux-kernel - Staging: serqt_usb2: kmalloc(GFP_NOIO) with spinlock held in qt_break() and qt

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Message-ID: <4E3BFF9E.9060504@ispras.ru>
Date:	Fri, 05 Aug 2011 18:35:10 +0400
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	gregkh@...e.de
CC:	wfp5p@...ginia.edu, linux-kernel@...r.kernel.org
Subject: Staging: serqt_usb2: kmalloc(GFP_NOIO) with spinlock held in qt_break()
 and qt_tiocmset()

qt_break() calls usb_control_msg() with spinlock held,
while usb_control_msg() calls kmalloc(GFP_NOIO) and indirectly usb_alloc_urb(GFP_NOIO).

The same is true for qt_tiocmget() and qt_tiocmset().

Is replacing spinlock with mutex an appropriate solution to fix the issue?

Found by Linux Driver Verification project (linuxtesting.org).

--
Alexey Khoroshilov
Linux Verification Center, ISPRAS
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