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authorDavid Henningsson <david.henningsson@canonical.com>2013-01-04 17:02:18 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-21 11:45:24 -0800
commitee415da5538413edc5d63c07899abc0b2b36bc54 (patch)
treebb974df2a43c028a23eb256623bae7fc130da0f2
parentd2e42ef98559ce48a516d40b64a7a489676d69f0 (diff)
downloadlinux-linaro-stable-ee415da5538413edc5d63c07899abc0b2b36bc54.tar.gz
ALSA: usb - fix race in creation of M-Audio Fast track pro driver
commit b98ae2729dea161edc96c9d177459b6c28bcbba5 upstream. A patch in the 3.2 kernel caused regression with hotplugging the M-Audio Fast track pro, or sound after suspend. I don't have the device so I haven't done a full analysis, but it seems userspace (both udev and pulseaudio) got confused when a card was created, immediately destroyed, and then created again. However, at least one person in the bug report (martin djfun) reports that this patch resolves the issue for him. It also leaves a message in the log: "snd-usb-audio: probe of 1-1.1:1.1 failed with error -5" which is a bit misleading. It is better than non-working audio, but maybe there's a more elegant solution? BugLink: https://bugs.launchpad.net/bugs/1095315 Signed-off-by: David Henningsson <david.henningsson@canonical.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Cc: CAI Qian <caiqian@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--sound/usb/quirks.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 27817266867a..c46171a2bf2f 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -387,11 +387,13 @@ static int snd_usb_fasttrackpro_boot_quirk(struct usb_device *dev)
* rules
*/
err = usb_driver_set_configuration(dev, 2);
- if (err < 0) {
+ if (err < 0)
snd_printdd("error usb_driver_set_configuration: %d\n",
err);
- return -ENODEV;
- }
+ /* Always return an error, so that we stop creating a device
+ that will just be destroyed and recreated with a new
+ configuration */
+ return -ENODEV;
} else
snd_printk(KERN_INFO "usb-audio: Fast Track Pro config OK\n");