md/raid5: let stripe batch bm_seq comparison wrap-safe

Once the 32-bit seq wraps, a newer bm_seq can look smaller than old, so .. covert to wrap-safe calculate way.

Chen Cheng committed 4 months ago

Commit 00e93fa1 parent 601d3c21 file · +1 −1Browse files

Unified · Split

drivers/md/raid5.c+1−1

@@ -996,7 +996,7 @@ static void stripe_add_to_batch_list(struct r5conf *conf, · 995 unmodified lines
996	if (test_and_clear_bit(STRIPE_BIT_DELAY, &sh->state)) {	996	if (test_and_clear_bit(STRIPE_BIT_DELAY, &sh->state)) {
997	int seq = sh->bm_seq;	997	int seq = sh->bm_seq;
998	if (test_bit(STRIPE_BIT_DELAY, &sh->batch_head->state) &&	998	if (test_bit(STRIPE_BIT_DELAY, &sh->batch_head->state) &&
999	sh->batch_head->bm_seq > seq)	999	sh->batch_head->bm_seq - seq > 0)
1000	seq = sh->batch_head->bm_seq;	1000	seq = sh->batch_head->bm_seq;
1001	set_bit(STRIPE_BIT_DELAY, &sh->batch_head->state);	1001	set_bit(STRIPE_BIT_DELAY, &sh->batch_head->state);
1002	sh->batch_head->bm_seq = seq;	1002	sh->batch_head->bm_seq = seq;