At failure of attempt to detect protocol extension, ALSA dice driver
should be fallback to limited functionality. However it's not.
This commit fixes it.
Cc: <stable@xxxxxxxxxxxxxxx> # v4.18+
Fixes: 58579c056c1c9 ("ALSA: dice: use extended protocol to detect available stream formats")
Signed-off-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>
---
sound/firewire/dice/dice-extension.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/sound/firewire/dice/dice-extension.c b/sound/firewire/dice/dice-extension.c
index a63fcbc875ad..02f4a8318e38 100644
--- a/sound/firewire/dice/dice-extension.c
+++ b/sound/firewire/dice/dice-extension.c
@@ -159,8 +159,11 @@ int snd_dice_detect_extension_formats(struct snd_dice *dice)
int j;
for (j = i + 1; j < 9; ++j) {
- if (pointers[i * 2] == pointers[j * 2])
+ if (pointers[i * 2] == pointers[j * 2]) {
+ // Fallback to limited functionality.
+ err = -ENXIO;
goto end;
+ }
}
}
--
2.20.1
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