linux-kernel - [PATCH] ALSA: usb-audio: fix control-request direction

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Date:   Fri, 21 May 2021 15:37:42 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Takashi Iwai <tiwai@...e.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, "Geoffrey D. Bennett" <g@...vu>,
        alsa-devel@...a-project.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        stable@...r.kernel.org
Subject: [PATCH] ALSA: usb-audio: fix control-request direction

The direction of the pipe argument must match the request-type direction
bit or control requests may fail depending on the host-controller-driver
implementation.

Fix the UAC2_CS_CUR request which erroneously used usb_sndctrlpipe().

Fixes: 93db51d06b32 ("ALSA: usb-audio: Check valid altsetting at parsing rates for UAC2/3")
Cc: stable@...r.kernel.org      # 5.10
Signed-off-by: Johan Hovold <johan@...nel.org>
---

There's a related bug in sound/usb/mixer_scarlett_gen2.c, which
Geoffrey reported and said he was preparing a patch for here:

	https://lore.kernel.org/r/20210520180819.GA95348@m.b4.vu

Johan


 sound/usb/format.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/usb/format.c b/sound/usb/format.c
index e6ff317a6785..2287f8c65315 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -436,7 +436,7 @@ static bool check_valid_altsetting_v2v3(struct snd_usb_audio *chip, int iface,
 	if (snd_BUG_ON(altsetting >= 64 - 8))
 		return false;
 
-	err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
+	err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
 			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 			      UAC2_AS_VAL_ALT_SETTINGS << 8,
 			      iface, &raw_data, sizeof(raw_data));
-- 
2.26.3