From b50c259e25d9260b9108dc0c2964c26e5ecbe1c1 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Tue, 14 Jan 2014 10:38:09 +1100 Subject: [PATCH] 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: 856e08e23762dfb92ffc68fd0a8d228f9e152160 Reported-by: Damian Nowak URL: https://bugzilla.kernel.org/show_bug.cgi?id=68181 Signed-off-by: NeilBrown --- drivers/md/raid10.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index c504e8389e69..65285211568f 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -1319,7 +1319,7 @@ read_again: /* Could not read all from this device, so we will * need another r10_bio. */ - sectors_handled = (r10_bio->sectors + max_sectors + sectors_handled = (r10_bio->sector + max_sectors - bio->bi_sector); r10_bio->sectors = max_sectors; spin_lock_irq(&conf->device_lock); @@ -1327,7 +1327,7 @@ read_again: bio->bi_phys_segments = 2; else bio->bi_phys_segments++; - spin_unlock(&conf->device_lock); + spin_unlock_irq(&conf->device_lock); /* Cannot call generic_make_request directly * as that will be queued in __generic_make_request * and subsequent mempool_alloc might block -- 2.30.2