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ALSA: firewire-lib: Fix 'amdtp_domain_start()' when no AMDTP_OUT_STREAM 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: 60dd49298e ("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>
This commit is contained in:
Christophe JAILLET 2021-06-24 20:49:36 +02:00 committed by Takashi Iwai
parent 5c89c2c7fb
commit 0cbbeaf370
1 changed files with 5 additions and 2 deletions
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7
sound/firewire/amdtp-stream.c
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@ -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;