ALSA: usb-audio: Remove unneeded wmb() in mixer_quirks

[ Upstream commit 9cea7425595697802e8d55a322a251999554b8b1 ]

Adding a memory barrier before wake_up() in
snd_usb_soundblaster_remote_complete() is supposed to ensure the write
to mixer->rc_code is visible in wait_event_interruptible() from
snd_usb_sbrc_hwdep_read().

However, this is not really necessary, since wake_up() is just a wrapper
over __wake_up() which already executes a full memory barrier before
accessing the state of the task to be waken up.

Drop the redundant call to wmb() and implicitly fix the checkpatch
complaint:

  WARNING: memory barrier without comment

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20250526-dualsense-alsa-jack-v1-8-1a821463b632@collabora.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index 3bd2daba8ecac932b0ed13e88ec0d1bb1e0f9f45..5f660c6933d2d1f7571e5ead63364075c32e6a98 100644 (file)
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -211,7 +211,6 @@ static void snd_usb_soundblaster_remote_complete(struct urb *urb)
        if (code == rc->mute_code)
                snd_usb_mixer_notify_id(mixer, rc->mute_mixer_id);
        mixer->rc_code = code;
-       wmb();
        wake_up(&mixer->rc_waitq);
 }