md/raid10: fix two bugs in handling of known-bad-blocks.
If we discover a bad block when reading we split the request and potentially read some of it from a different device. The code path of this has two bugs in RAID10. 1/ we get a spin_lock with _irq, but unlock without _irq!! 2/ The calculation of 'sectors_handled' is wrong, as can be clearly seen by comparison with raid1.c This leads to at least 2 warnings and a probable crash is a RAID10 ever had known bad blocks. Cc: stable@vger.kernel.org (v3.1+) Fixes: 856e08e2Reported-by: Damian Nowak <spam@nowaker.net> URL: https://bugzilla.kernel.org/show_bug.cgi?id=68181Signed-off-by: NeilBrown <neilb@suse.de>
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