md/raid5: don't record new size if resize_stripes fails.
authorNeilBrown <neilb@suse.de>
Fri, 8 May 2015 08:19:34 +0000 (18:19 +1000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 6 Jun 2015 06:19:59 +0000 (23:19 -0700)
commit3763b3c77e2c77aa226fde2fac64bd85a2b85c80
tree338cdcf6f23a65ce730723fcce5c1dc2640d08ca
parentc709ca10c52b9bf7f0e4cb2e0d689f37eee991d0
md/raid5: don't record new size if resize_stripes fails.

commit 6e9eac2dcee5e19f125967dd2be3e36558c42fff upstream.

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")
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/md/raid5.c