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Commit 6116ea07 authored by Takashi Iwai's avatar Takashi Iwai Committed by Jaroslav Kysela
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[ALSA] Fix possible deadlocks in sequencer at removal of ports 



Fix possible rwsem deadlocks in sequencer code at removal of
sequencer ports.  The list_lock of port group can be double
locked.

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarJaroslav Kysela <perex@suse.cz>
parent 2594d960

sound/core/seq/seq_ports.c

+1 −1
Original line number Diff line number Diff line
@@ -245,9 +245,9 @@ static void clear_subscriber_list(struct snd_seq_client *client, 
				list_del(&subs->dest_list);

			else

				list_del(&subs->src_list);

			up_write(&agrp->list_mutex);

			unsubscribe_port(c, aport, agrp, &subs->info, 1);

			kfree(subs);

			up_write(&agrp->list_mutex);

			snd_seq_port_unlock(aport);

			snd_seq_client_unlock(c);

		}