From: Christophe JAILLET christophe.jaillet@wanadoo.fr
stable inclusion from stable-5.10.50 commit dd6d4e92e7240ed92583eacf097289a13d971d73 bugzilla: 174522 https://gitee.com/openeuler/kernel/issues/I4DNFY
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 0cbbeaf370221fc469c95945dd3c1198865c5fe4 ]
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/9c9a53a4905984a570ba5672cbab84f2027dedc1.162456048... Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- sound/firewire/amdtp-stream.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c index 5805c5de39fb..7a282d8e7148 100644 --- a/sound/firewire/amdtp-stream.c +++ b/sound/firewire/amdtp-stream.c @@ -1404,14 +1404,17 @@ int amdtp_domain_start(struct amdtp_domain *d, unsigned int ir_delay_cycle) unsigned int queue_size; struct amdtp_stream *s; int cycle; + bool found = false; int err;
// 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;