This is a note to let you know that I've just added the patch titled
ALSA: usb - fix race in creation of M-Audio Fast track pro driver
to the 3.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-usb-fix-race-in-creation-of-m-audio-fast-track-pro-driver.patch
and it can be found in the queue-3.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From b98ae2729dea161edc96c9d177459b6c28bcbba5 Mon Sep 17 00:00:00 2001
From: David Henningsson <david.hennings...@canonical.com>
Date: Fri, 4 Jan 2013 17:02:18 +0100
Subject: ALSA: usb - fix race in creation of M-Audio Fast track pro driver
From: David Henningsson <david.hennings...@canonical.com>
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.hennings...@canonical.com>
Signed-off-by: Takashi Iwai <ti...@suse.de>
Cc: CAI Qian <caiq...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
sound/usb/quirks.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -387,11 +387,13 @@ static int snd_usb_fasttrackpro_boot_qui
* 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");
Patches currently in stable-queue which might be from
david.hennings...@canonical.com are
queue-3.7/alsa-usb-fix-race-in-creation-of-m-audio-fast-track-pro-driver.patch
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