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authorDan Williams <dan.j.williams@intel.com>2011-11-08 16:22:06 +1100
committerNeilBrown <neilb@suse.de>2011-11-08 16:22:06 +1100
commit257a4b42af7586fab4eaec7f04e6896b86551843 (patch)
treeec65357b2320ba4e4341a2853245048889666f5c /drivers/md
parent9a3f530f39f4490eaa18b02719fb74ce5f4d2d86 (diff)
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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')
-rw-r--r--drivers/md/raid5.c4
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)