Patch "ALSA: firewire-lib: Fix 'amdtp_domain_start()' when no AMDTP_OUT_STREAM stream is found" has been added to the 5.13-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

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

to the 5.13-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     alsa-firewire-lib-fix-amdtp_domain_start-when-no-amd.patch
and it can be found in the queue-5.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 525b94620834f273a52be66e712214801c04d1d9
Author: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Date:   Thu Jun 24 20:49:36 2021 +0200

    ALSA: firewire-lib: Fix 'amdtp_domain_start()' when no AMDTP_OUT_STREAM stream is found
    
    [ 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@xxxxxxxxxx>
    Acked-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/9c9a53a4905984a570ba5672cbab84f2027dedc1.1624560484.git.christophe.jaillet@xxxxxxxxxx
    Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

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;