From: NeilBrown <neilb@suse.de>
Date: Fri, 8 May 2015 08:19:34 +0000 (+1000)
Subject: md/raid5: don't record new size if resize_stripes fails.
X-Git-Tag: omap-for-v4.2/wakeirq-drivers~2^2~39^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e9eac2dcee5e19f125967dd2be3e36558c42fff;p=pandora-kernel.git

md/raid5: don't record new size if resize_stripes fails.

If any memory allocation in resize_stripes fails we will return
-ENOMEM, but in some cases we update conf->pool_size anyway.

This means that if we try again, the allocations will be assumed
to be larger than they are, and badness results.

So only update pool_size if there is no error.

This bug was introduced in 2.6.17 and the patch is suitable for
-stable.

Fixes: ad01c9e3752f ("[PATCH] md: Allow stripes to be expanded in preparation for expanding an array")
Cc: stable@vger.kernel.org (v2.6.17+)
Signed-off-by: NeilBrown <neilb@suse.de>
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