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>

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 0f58b4b6d7023d0e4c47734216e276132c2fbe80..b8d1ad13f8c0b502a6315d01cc0764c62f550a61 100644 (file)
--- 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");