From 430c701136b9168fbb63b6391af0b8f4216817a9 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Thu, 25 Apr 2013 07:38:15 +0200 Subject: ALSA: usb-audio: Fix autopm error during probing MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit commit 60af3d037eb8c670dcce31401501d1271e7c5d95 upstream. 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 Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/usb/card.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'sound') diff --git a/sound/usb/card.c b/sound/usb/card.c index 8d0a3c1..ce29d87 100644 --- a/sound/usb/card.c +++ b/sound/usb/card.c @@ -610,7 +610,9 @@ 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); -- cgit v1.1