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ALSA: hda/hdmi - Work around "alsactl restore" errors 

When "alsactl restore" is performed on HDMI codecs, it tries to
restore the channel map value since the channel map controls are
writable.  But hdmi_chmap_ctl_put() returns -EBADFD when no PCM stream
is assigned yet, and this results in an error message from alsactl.
Although the error is harmless, it's certainly ugly and can be
regarded as a regression.

As a workaround, this patch changes the return code in such a case to
be zero for making others happy.  (A slight excuse is: when the chmap
is changed through the proper alsa-lib API, the PCM status is checked
there anyway, so we don't have to be too strict in the kernel side.)

Cc: <stable@vger.kernel.org> [v3.7+]
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2013-01-15 14:44:41 +01:00
parent 2e4c4dbed0
commit 6f54c36132
1 changed files with 1 additions and 1 deletions
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2
sound/pci/hda/patch_hdmi.c
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@ -1502,7 +1502,7 @@ static int hdmi_chmap_ctl_put(struct snd_kcontrol *kcontrol,
ctl_idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
substream = snd_pcm_chmap_substream(info, ctl_idx);
if (!substream || !substream->runtime)
return -EBADFD;
return 0; /* just for avoiding error from alsactl restore */
switch (substream->runtime->status->state) {
case SNDRV_PCM_STATE_OPEN:
case SNDRV_PCM_STATE_SETUP: