From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Thu, 25 Dec 2008 12:38:38 +0000 (+0100)
Subject: [S390] serialize stp/etr work
X-Git-Tag: v2.6.29-rc1~584^2~77
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0b3016b781abeabc502042c942cbc611e31250c7;p=pandora-kernel.git

[S390] serialize stp/etr work

The work function dispatched with schedule_work() can be run twice
on different cpus because run_workqueue clears the WORK_STRUCT_PENDING
bit and then executes the function. Another cpu can call schedule_work()
again and run the work function a second time before the first call
is completed. This patch serialized the etr and stp work function with
a mutex.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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