From: xuhanwu <xu.hanwu@xxxxxxxxxx>
The function soc_pcm_trigger needs to return an error(-EINVAL)
if the cmd parameter is not supported.
Signed-off-by: xuhanwu <xu.hanwu@xxxxxxxxxx>
---
Dear Brown
Thank you for your guidance.
The issue with characters exceeding 80 has been resolved.
> As can be seen from inspection of the immediately
> preceeding handling of start, we're deliberately
> ignoring half the values in each switch.
In kernel version 6.2, when the soc_pcm_trigger function receives a
command parameter cmd set to SNDRV_PCM_TRIGGER_DRAIN,
it returns a value of -EINVAL.The function snd_pcm_drain checks
the returned error value and exits accordingly.
kernel-version6.2 Function call relationship
snd_pcm_drain->
snd_pcm_action->
snd_pcm_do_drain_init->
soc_pcm_trigger->
snd_pcm_drain
result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
ACTION_ARG_IGNORE);
if (result < 0)
goto unlock;
snd_pcm_do_drain_init
if (runtime->state == SNDRV_PCM_STATE_DRAINING &&
runtime->trigger_master == substream &&
(runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
return substream->ops->trigger(substream,
SNDRV_PCM_TRIGGER_DRAIN);
In the latest code, when the cmd parameter is set to SNDRV_PCM_TRIGGER_DRAIN,
the return value is 0. If snd_pcm_drain finds that the return value is 0,
it will not execute the goto unlock;
The above is my understanding of the code, please help me correct it.
Thanks
Xuhanwu
---
sound/soc/soc-pcm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 77ee103b7..eba737729 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -1173,6 +1173,9 @@ static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
if (r < 0)
break;
}
+ break;
+ default:
+ return -EINVAL;
}
/*
--
2.17.1
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