[alsa-devel] [PATCH] pcm: Don't store the state for SND_PCM_STATE_SUSPENDED

[Takashi Iwai]

On Tue, 10 May 2016 09:45:46 +0200,
Shengjiu Wang wrote:
> 
> The resume function don't update the dmix->state, if store SUSPENDED
> state in snd_pcm_dmix_state, the write function after resume will
> return error -ESTRPIPE, because the snd_pcm_write_areas() will check
> the state of the pcm device.
> This patch remove the store SND_PCM_STATE_SUSPENDED state operation
> for dmix,dshare,dsnoop.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang at freescale.com>

What's the exact problem you're seeing on surface?  Could illustrate
how the bug is triggered and how to reproduce easily?  It'll make
easier to understand what you're trying to fix.


thanks,

Takashi


> ---
>  src/pcm/pcm_dmix.c   | 2 +-
>  src/pcm/pcm_dshare.c | 2 +-
>  src/pcm/pcm_dsnoop.c | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/src/pcm/pcm_dmix.c b/src/pcm/pcm_dmix.c
> index 007d356..66bb288 100644
> --- a/src/pcm/pcm_dmix.c
> +++ b/src/pcm/pcm_dmix.c
> @@ -451,9 +451,9 @@ static snd_pcm_state_t snd_pcm_dmix_state(snd_pcm_t *pcm)
>  	state = snd_pcm_state(dmix->spcm);
>  	switch (state) {
>  	case SND_PCM_STATE_XRUN:
> -	case SND_PCM_STATE_SUSPENDED:
>  	case SND_PCM_STATE_DISCONNECTED:
>  		dmix->state = state;
> +	case SND_PCM_STATE_SUSPENDED:
>  		return state;
>  	default:
>  		break;
> diff --git a/src/pcm/pcm_dshare.c b/src/pcm/pcm_dshare.c
> index adb3587..a133c72 100644
> --- a/src/pcm/pcm_dshare.c
> +++ b/src/pcm/pcm_dshare.c
> @@ -241,9 +241,9 @@ static snd_pcm_state_t snd_pcm_dshare_state(snd_pcm_t *pcm)
>  	state = snd_pcm_state(dshare->spcm);
>  	switch (state) {
>  	case SND_PCM_STATE_XRUN:
> -	case SND_PCM_STATE_SUSPENDED:
>  	case SND_PCM_STATE_DISCONNECTED:
>  		dshare->state = state;
> +	case SND_PCM_STATE_SUSPENDED:
>  		return state;
>  	default:
>  		break;
> diff --git a/src/pcm/pcm_dsnoop.c b/src/pcm/pcm_dsnoop.c
> index 8ff0ba5..d56dd97 100644
> --- a/src/pcm/pcm_dsnoop.c
> +++ b/src/pcm/pcm_dsnoop.c
> @@ -205,9 +205,9 @@ static snd_pcm_state_t snd_pcm_dsnoop_state(snd_pcm_t *pcm)
>  	state = snd_pcm_state(dsnoop->spcm);
>  	switch (state) {
>  	case SND_PCM_STATE_XRUN:
> -	case SND_PCM_STATE_SUSPENDED:
>  	case SND_PCM_STATE_DISCONNECTED:
>  		dsnoop->state = state;
> +	case SND_PCM_STATE_SUSPENDED:
>  		return state;
>  	default:
>  		break;
> -- 
> 1.9.1
>