[alsa-devel] [PATCH v2] ALSA: pcm: Return 0 when size < start_threshold in capture
In __snd_pcm_lib_xfer(), when capture, if state is PREPARED and size is less than start_threshold nothing can be done. As there is no error, 0 is returned.
Signed-off-by: Ricardo Biehl Pasquali pasqualirb@gmail.com ---
version 2: The code was not changed. Just resubmitting to follow the rules from Documentation/process/submitting-patches.rst.
--- pcm_lib.c.orig 2018-08-21 15:31:54.457405053 -0300 +++ pcm_lib.c 2018-08-21 15:56:01.264549084 -0300 @@ -2125,7 +2125,7 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(str pcm_transfer_f transfer; bool nonblock; bool is_playback; - int err; + int err = 0;
err = pcm_sanity_check(substream); if (err < 0) @@ -2173,11 +2173,15 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(str goto _end_unlock;
if (!is_playback && - runtime->status->state == SNDRV_PCM_STATE_PREPARED && - size >= runtime->start_threshold) { - err = snd_pcm_start(substream); - if (err < 0) + runtime->status->state == SNDRV_PCM_STATE_PREPARED) { + if (size >= runtime->start_threshold) { + err = snd_pcm_start(substream); + if (err < 0) + goto _end_unlock; + } else { + /* nothing to do */ goto _end_unlock; + } }
runtime->twake = runtime->control->avail_min ? : 1;
On Wed, 22 Aug 2018 17:03:59 +0200, Ricardo Biehl Pasquali wrote:
In __snd_pcm_lib_xfer(), when capture, if state is PREPARED and size is less than start_threshold nothing can be done. As there is no error, 0 is returned.
Signed-off-by: Ricardo Biehl Pasquali pasqualirb@gmail.com
version 2: The code was not changed. Just resubmitting to follow the rules from Documentation/process/submitting-patches.rst.
Almost good, but still not perfect, unfortunately :) The patch should be applicable onto the kernel tree as is with -p1 option, i.e. the diff should be like --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c
But never mind, I'll apply this manually at this time, just keep the above in mind for the next time.
Currently we're dealing with 4.19 merge, hence I'm going to queue to the branch for 4.20.
thanks,
Takashi
--- pcm_lib.c.orig 2018-08-21 15:31:54.457405053 -0300 +++ pcm_lib.c 2018-08-21 15:56:01.264549084 -0300 @@ -2125,7 +2125,7 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(str pcm_transfer_f transfer; bool nonblock; bool is_playback;
- int err;
int err = 0;
err = pcm_sanity_check(substream); if (err < 0)
@@ -2173,11 +2173,15 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(str goto _end_unlock;
if (!is_playback &&
runtime->status->state == SNDRV_PCM_STATE_PREPARED &&size >= runtime->start_threshold) {err = snd_pcm_start(substream);if (err < 0)
runtime->status->state == SNDRV_PCM_STATE_PREPARED) {if (size >= runtime->start_threshold) {err = snd_pcm_start(substream);if (err < 0)goto _end_unlock;} else {/* nothing to do */ goto _end_unlock;}}
runtime->twake = runtime->control->avail_min ? : 1;
Takashi wrote:
Almost good, but still not perfect, unfortunately :) The patch should be applicable onto the kernel tree as is with -p1 option, i.e. the diff should be like --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c
But never mind, I'll apply this manually at this time, just keep the above in mind for the next time.
Ok, thank you!
The .orig thing is ok if I had used the full pathname?
diff does not generate a/ and b/ (at least with '-up' options). By the way, 'diff -up' is what submitting-patches document recommends when no git tree is available.
On Wed, 22 Aug 2018 17:25:24 +0200, Ricardo Biehl Pasquali wrote:
Takashi wrote:
Almost good, but still not perfect, unfortunately :) The patch should be applicable onto the kernel tree as is with -p1 option, i.e. the diff should be like --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c
But never mind, I'll apply this manually at this time, just keep the above in mind for the next time.
Ok, thank you!
The .orig thing is ok if I had used the full pathname?
That's OK. The patch just needs to be simply applicable with -p1.
Takashi
participants (2)
-
Ricardo Biehl Pasquali -
Takashi Iwai