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| author | Dan Williams <dan.j.williams@intel.com> | 2011-11-08 16:22:06 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2011-11-08 16:22:06 +1100 |
| commit | 257a4b42af7586fab4eaec7f04e6896b86551843 (patch) | |
| tree | ec65357b2320ba4e4341a2853245048889666f5c /drivers/md/raid5.c | |
| parent | 9a3f530f39f4490eaa18b02719fb74ce5f4d2d86 (diff) | |
| download | linux-stable-257a4b42af7586fab4eaec7f04e6896b86551843.tar.gz linux-stable-257a4b42af7586fab4eaec7f04e6896b86551843.tar.bz2 linux-stable-257a4b42af7586fab4eaec7f04e6896b86551843.zip | |
md/raid5: STRIPE_ACTIVE has lock semantics, add barriers
All updates that occur under STRIPE_ACTIVE should be globally visible
when STRIPE_ACTIVE clears. test_and_set_bit() implies a barrier, but
clear_bit() does not.
This is suitable for 3.1-stable.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Cc: stable@kernel.org
Diffstat (limited to 'drivers/md/raid5.c')
| -rw-r--r-- | drivers/md/raid5.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 318bdae9b56c..297e26092178 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -3110,7 +3110,7 @@ static void handle_stripe(struct stripe_head *sh) struct r5dev *pdev, *qdev; clear_bit(STRIPE_HANDLE, &sh->state); - if (test_and_set_bit(STRIPE_ACTIVE, &sh->state)) { + if (test_and_set_bit_lock(STRIPE_ACTIVE, &sh->state)) { /* already being handled, ensure it gets handled * again when current action finishes */ set_bit(STRIPE_HANDLE, &sh->state); @@ -3375,7 +3375,7 @@ finish: return_io(s.return_bi); - clear_bit(STRIPE_ACTIVE, &sh->state); + clear_bit_unlock(STRIPE_ACTIVE, &sh->state); } static void raid5_activate_delayed(struct r5conf *conf) |