md/raid0: fix bug with chunksize not a power of 2.
authorNeilBrown <neilb@suse.de>
Fri, 10 Apr 2015 03:19:04 +0000 (13:19 +1000)
committerNeilBrown <neilb@suse.de>
Fri, 10 Apr 2015 05:36:31 +0000 (15:36 +1000)
commit47d68979cc968535cb87f3e5f2e6a3533ea48fbd
treed185ddd30e360015cb4fec25155595655de89de2
parent74672d069b298b03e9f657fd70915e055739882e
md/raid0: fix bug with chunksize not a power of 2.

Since commit 20d0189b1012a37d2533a87fb451f7852f2418d1
in v3.14-rc1 RAID0 has performed incorrect calculations
when the chunksize is not a power of 2.

This happens because "sector_div()" modifies its first argument, but
this wasn't taken into account in the patch.

So restore that first arg before re-using the variable.

Reported-by: Joe Landman <joe.landman@gmail.com>
Reported-by: Dave Chinner <david@fromorbit.com>
Fixes: 20d0189b1012a37d2533a87fb451f7852f2418d1
Cc: stable@vger.kernel.org (3.14 and later).
Signed-off-by: NeilBrown <neilb@suse.de>
drivers/md/raid0.c