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authorNeilBrown <neilb@suse.de>2012-10-11 13:50:13 +1100
committerNeilBrown <neilb@suse.de>2012-10-11 13:50:13 +1100
commit1ed850f356a0a422013846b5291acff08815008b (patch)
tree9dd66a6b204a385574b7a885b6415e58f26a6780 /drivers
parenta7854487cd7128a30a7f4f5259de9f67d5efb95f (diff)
md/raid5: make sure to_read and to_write never go negative.
to_read and to_write are part of the result of analysing a stripe before handling it. Their use is to avoid some loops and tests if the values are known to be zero. Thus it is not a problem if they are a little bit larger than they should be. So decrementing them in handle_failed_stripe serves little value, and due to races it could cause some loops to be skipped incorrectly. So remove those decrements. Reported-by: "Jianpeng Ma" <majianpeng@gmail.com> Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/raid5.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 9de8221f64e..ab613efbbea 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2507,10 +2507,8 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
bi = sh->dev[i].towrite;
sh->dev[i].towrite = NULL;
spin_unlock_irq(&sh->stripe_lock);
- if (bi) {
- s->to_write--;
+ if (bi)
bitmap_end = 1;
- }
if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags))
wake_up(&conf->wait_for_overlap);
@@ -2558,7 +2556,6 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
spin_unlock_irq(&sh->stripe_lock);
if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags))
wake_up(&conf->wait_for_overlap);
- if (bi) s->to_read--;
while (bi && bi->bi_sector <
sh->dev[i].sector + STRIPE_SECTORS) {
struct bio *nextbi =