This is a note to let you know that I've just added the patch titled
ALSA: snd-usb: mixer: ignore -EINVAL in snd_usb_mixer_controls()
to the 3.8-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-snd-usb-mixer-ignore-einval-in-snd_usb_mixer_controls.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 83ea5d18d74f032a760fecde78c0210f66f7f70c Mon Sep 17 00:00:00 2001
From: Daniel Mack <zonque@xxxxxxxxx>
Date: Tue, 19 Mar 2013 21:09:25 +0100
Subject: ALSA: snd-usb: mixer: ignore -EINVAL in snd_usb_mixer_controls()
From: Daniel Mack <zonque@xxxxxxxxx>
commit 83ea5d18d74f032a760fecde78c0210f66f7f70c upstream.
Creation of individual mixer controls may fail, but that shouldn't cause
the entire mixer creation to fail. Even worse, if the mixer creation
fails, that will error out the entire device probing.
All the functions called by parse_audio_unit() should return -EINVAL if
they find descriptors that are unsupported or believed to be malformed,
so we can safely handle this error code as a non-fatal condition in
snd_usb_mixer_controls().
That fixes a long standing bug which is commonly worked around by
adding quirks which make the driver ignore entire interfaces. Some of
them might now be unnecessary.
Signed-off-by: Daniel Mack <zonque@xxxxxxxxx>
Reported-and-tested-by: Rodolfo Thomazelli <pe.soberbo@xxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/usb/mixer.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -2122,7 +2122,7 @@ static int snd_usb_mixer_controls(struct
state.oterm.type = le16_to_cpu(desc->wTerminalType);
state.oterm.name = desc->iTerminal;
err = parse_audio_unit(&state, desc->bSourceID);
- if (err < 0)
+ if (err < 0 && err != -EINVAL)
return err;
} else { /* UAC_VERSION_2 */
struct uac2_output_terminal_descriptor *desc = p;
@@ -2134,12 +2134,12 @@ static int snd_usb_mixer_controls(struct
state.oterm.type = le16_to_cpu(desc->wTerminalType);
state.oterm.name = desc->iTerminal;
err = parse_audio_unit(&state, desc->bSourceID);
- if (err < 0)
+ if (err < 0 && err != -EINVAL)
return err;
/* for UAC2, use the same approach to also add the clock selectors */
err = parse_audio_unit(&state, desc->bCSourceID);
- if (err < 0)
+ if (err < 0 && err != -EINVAL)
return err;
}
}
Patches currently in stable-queue which might be from zonque@xxxxxxxxx are
queue-3.8/alsa-snd-usb-mixer-propagate-errors-up-the-call-chain.patch
queue-3.8/alsa-snd-usb-mixer-ignore-einval-in-snd_usb_mixer_controls.patch
queue-3.8/alsa-usb-parse-uac2-extension-unit-like-for-uac1.patch
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