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| author | Takashi Iwai <tiwai@suse.de> | 2013-04-25 09:38:15 +0400 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2013-04-25 09:46:51 +0400 |
| commit | 60af3d037eb8c670dcce31401501d1271e7c5d95 (patch) | |
| tree | d3399aae19493e16cec50d613c1f0d72732e4028 /sound/usb/card.c | |
| parent | ebfc594c02148b6a85c2f178cf167a44a3c3ce10 (diff) | |
| download | linux-60af3d037eb8c670dcce31401501d1271e7c5d95.tar.xz | |
ALSA: usb-audio: Fix autopm error during probing
We've got strange errors in get_ctl_value() in mixer.c during
probing, e.g. on Hercules RMX2 DJ Controller:
ALSA mixer.c:352 cannot get ctl value: req = 0x83, wValue = 0x201, wIndex = 0xa00, type = 4
ALSA mixer.c:352 cannot get ctl value: req = 0x83, wValue = 0x200, wIndex = 0xa00, type = 4
....
It turned out that the culprit is autopm: snd_usb_autoresume() returns
-ENODEV when called during card->probing = 1.
Since the call itself during card->probing = 1 is valid, let's fix the
return value of snd_usb_autoresume() as success.
Reported-and-tested-by: Daniel Schürmann <daschuer@mixxx.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/card.c')
| -rw-r--r-- | sound/usb/card.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sound/usb/card.c b/sound/usb/card.c index 5254b18cedcd..1a033177b83f 100644 --- a/sound/usb/card.c +++ b/sound/usb/card.c @@ -631,7 +631,9 @@ int snd_usb_autoresume(struct snd_usb_audio *chip) int err = -ENODEV; down_read(&chip->shutdown_rwsem); - if (!chip->shutdown && !chip->probing) + if (chip->probing) + err = 0; + else if (!chip->shutdown) err = usb_autopm_get_interface(chip->pm_intf); up_read(&chip->shutdown_rwsem); |