From: Douglas Gilbert <dgilbert@interlog.com>
Date: Sun, 31 Aug 2014 23:09:59 +0000 (-0400)
Subject: scsi_debug: deadlock between completions and surprise module removal
X-Git-Tag: fixes-for-v3.18-merge-window~25^2^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=db525fce95f0ee39102f06f8599ced3f3f3af128;p=pandora-kernel.git

scsi_debug: deadlock between completions and surprise module removal

A deadlock has been reported when the completion
of SCSI commands (simulated by a timer) was surprised
by a module removal. This patch removes one half of
the offending locks around timer deletions. This fix
is applied both to stop_all_queued() which is were
the deadlock was discovered and stop_queued_cmnd()
which has very similar logic.

This patch should be applied both to the lk 3.17 tree
and Christoph's drivers-for-3.18 tree.

Tested-and-reported-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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