ALSA: firewire-lib: Fix 'amdtp_domain_start()' when no AMDTP_OUT_STREAM stream is...

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: 60dd49298ec5 ("ALSA: firewire-lib: handle several AMDTP streams in callback handler of IRQ target")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/9c9a53a4905984a570ba5672cbab84f2027dedc1.1624560484.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index aad9778d1c4d4b9f02757f4475b18b0b6853e89f..9be2260e4ca2d26b41c9784b686ae6080a0e6954 100644 (file)
--- 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;