From: Mike Snitzer <snitzer@redhat.com>
Date: Sat, 12 May 2012 00:43:21 +0000 (+0100)
Subject: dm mpath: check if scsi_dh module already loaded before trying to load
X-Git-Tag: v3.4-rc7~5^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=510193a2d3d2e03ae53b95c0ae4f33cdff02cbf8;p=pandora-kernel.git

dm mpath: check if scsi_dh module already loaded before trying to load

If the requested scsi_dh module is already loaded then skip
request_module().

Multipath table loads can hang in an unnecessary __request_module.

Reported-by: Ben Marzinski <bmarzins@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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