ALSA: firewire-lib: Fix 'amdtp_domain_start()' when no AMDTP_OUT_STRE…

…AM stream is found The intent here is to return an error code if we don't find what we are looking for in the 'list_for_each_entry()' loop. 's' is not NULL if the list is empty or if we scan the complete list. Introduce a new 'found' variable to handle such cases. Fixes: 60dd492 ("ALSA: firewire-lib: handle several AMDTP streams in callback handler of IRQ target") Signed-off-by: Christophe JAILLET <[email protected]> Acked-by: Takashi Sakamoto <[email protected]> Link: https://lore.kernel.org/r/9c9a53a4905984a570ba5672cbab84f2027dedc1.1624560484.git.christophe.jaillet@wanadoo.fr Signed-off-by: Takashi Iwai <[email protected]>
ambv · Jun 25, 2021 · 0cbbeaf · 0cbbeaf
1 parent 5c89c2c
commit 0cbbeaf
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
@@ -1943,6 +1943,7 @@ int amdtp_domain_start(struct amdtp_domain *d, unsigned int tx_init_skip_cycles,
 	unsigned int events_per_period = d->events_per_period;
 	unsigned int queue_size;
 	struct amdtp_stream *s;
+	bool found = false;
 	int err;
 
 	if (replay_seq) {
@@ -1955,10 +1956,12 @@ int amdtp_domain_start(struct amdtp_domain *d, unsigned int tx_init_skip_cycles,
 
 	// Select an IT context as IRQ target.
 	list_for_each_entry(s, &d->streams, list) {
-		if (s->direction == AMDTP_OUT_STREAM)
+		if (s->direction == AMDTP_OUT_STREAM) {
+			found = true;
 			break;
+		}
 	}
-	if (!s)
+	if (!found)
 		return -ENXIO;
 	d->irq_target = s;