linux-kernel - [019/121] ALSA: usb: Parse UAC2 extension unit like for UAC1

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Message-ID: <lsq.1378608721.639929663@decadent.org.uk>
Date:	Sun, 08 Sep 2013 03:52:01 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Torstein Hegge" <hegge@...isty.net>,
	"Daniel Mack" <zonque@...il.com>, "Takashi Iwai" <tiwai@...e.de>
Subject: [019/121] ALSA: usb: Parse UAC2 extension unit like for UAC1

3.2.51-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Torstein Hegge <hegge@...isty.net>

commit 61ac51301e6c6d4ed977d7674ce2b8e713619a9b upstream.

UAC2_EXTENSION_UNIT_V2 differs from UAC1_EXTENSION_UNIT, but can be handled in
the same way when parsing the unit. Otherwise parse_audio_unit() fails when it
sees an extension unit on a UAC2 device.

UAC2_EXTENSION_UNIT_V2 is outside the range allocated by UAC1.

Signed-off-by: Torstein Hegge <hegge@...isty.net>
Acked-by: Daniel Mack <zonque@...il.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/usb/mixer.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -722,7 +722,8 @@ static int check_input_term(struct mixer
 		case UAC1_PROCESSING_UNIT:
 		case UAC1_EXTENSION_UNIT:
 		/* UAC2_PROCESSING_UNIT_V2 */
-		/* UAC2_EFFECT_UNIT */ {
+		/* UAC2_EFFECT_UNIT */
+		case UAC2_EXTENSION_UNIT_V2: {
 			struct uac_processing_unit_descriptor *d = p1;
 
 			if (state->mixer->protocol == UAC_VERSION_2 &&
@@ -1967,6 +1968,8 @@ static int parse_audio_unit(struct mixer
 			return parse_audio_extension_unit(state, unitid, p1);
 		else /* UAC_VERSION_2 */
 			return parse_audio_processing_unit(state, unitid, p1);
+	case UAC2_EXTENSION_UNIT_V2:
+		return parse_audio_extension_unit(state, unitid, p1);
 	default:
 		snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
 		return -EINVAL;

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