From: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Date: Thu, 21 Aug 2008 17:46:39 +0000 (+0200)
Subject: [S390] cio: call ccw driver notify function with lock held
X-Git-Tag: v2.6.27-rc5~58
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=91c36919a456589f4f073671474a1f899e0d3c2b;p=pandora-kernel.git

[S390] cio: call ccw driver notify function with lock held

Calling a ccw driver's notify function without the ccw device lock
held opens up a race window between discovery and handling of a change
in the device operational state. As a result, the device driver may
encounter unexpected device malfunction, leading to out-of-retry
situations or similar.

Remove race by extending the ccw device lock from state change
discovery to the calling of the notify function.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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