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Commit 143c4d05 authored by NeilBrown's avatar NeilBrown
Browse files

md/raid5: add some missing locking in handle_failed_stripe. 



We really should hold the stripe_lock while accessing
'toread' else we could race with add_stripe_bio and corrupt
a list.

Reported-by: default avatar"Jianpeng Ma" <majianpeng@gmail.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 9e444768

drivers/md/raid5.c

+2 −0
Original line number Diff line number Diff line
@@ -2552,8 +2552,10 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh, 
		if (!test_bit(R5_Wantfill, &sh->dev[i].flags) &&

		    (!test_bit(R5_Insync, &sh->dev[i].flags) ||

		      test_bit(R5_ReadError, &sh->dev[i].flags))) {

			spin_lock_irq(&sh->stripe_lock);

			bi = sh->dev[i].toread;

			sh->dev[i].toread = NULL;

			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--;