From: NeilBrown <neilb@suse.de>
Date: Tue, 31 Jul 2012 00:04:55 +0000 (+1000)
Subject: md: remove duplicated test on ->openers when calling do_md_stop()
X-Git-Tag: v3.6-rc1~21^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=90cf195d9bcb4bf70e8b6df5073b05164b279ba0;p=pandora-kernel.git

md: remove duplicated test on ->openers when calling do_md_stop()

do_md_stop tests mddev->openers while holding ->open_mutex,
and fails if this count is too high.
So callers do not need to check mddev->openers and doing so isn't
very meaningful as they don't hold ->open_mutex so the number could
change.

So remove the unnecessary tests on mddev->openers.
These are not called often enough for there to be any gain in
an early test on ->open_mutex to avoid the need for a slightly more
costly mutex_lock call.

Signed-off-by: NeilBrown <neilb@suse.de>
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