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Commit 41fe75f6 authored by majianpeng's avatar majianpeng Committed by NeilBrown
Browse files

md/raid5: use atomic_dec_return() instead of atomic_dec() and atomic_read(). 



Signed-off-by: default avatarmajianpeng <majianpeng@gmail.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 43437ecd

drivers/md/raid5.c

+3 −4
Original line number Diff line number Diff line
@@ -208,11 +208,10 @@ static void __release_stripe(struct r5conf *conf, struct stripe_head *sh) 
			md_wakeup_thread(conf->mddev->thread);

		} else {

			BUG_ON(stripe_operations_active(sh));

			if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) {

				atomic_dec(&conf->preread_active_stripes);

				if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD)

			if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))

				if (atomic_dec_return(&conf->preread_active_stripes)

				    < IO_THRESHOLD)

					md_wakeup_thread(conf->mddev->thread);

			}

			atomic_dec(&conf->active_stripes);

			if (!test_bit(STRIPE_EXPANDING, &sh->state)) {

				list_add_tail(&sh->lru, &conf->inactive_list);