From: Sebastian Ott <sebott@linux.vnet.ibm.com>
Date: Fri, 13 Jun 2014 15:02:24 +0000 (+0200)
Subject: s390/ccwgroup: obtain extra reference for asynchronous processing
X-Git-Tag: omap-for-v3.17/soc-cleanup~65^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9280ddb19489fa24e2d4f6f492d185ae1172bec2;p=pandora-kernel.git

s390/ccwgroup: obtain extra reference for asynchronous processing

Commit 0b60f9ead5d4816e7e3d6e28f4a0d22d4a1b2513
"s390: use device_remove_file_self() instead of device_schedule_callback()"
changed ccwgroup to use an extra work queue instead of
device_schedule_callback. This function obtained an extra device
reference for its async work which is missing in the new implementation
and results in a "freeing memory with a lock still held" BUG. Fix
this by obtaining an extra reference for the async work.

Reported-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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