FAILED: patch "[PATCH] ALSA: usb-audio: Don't avoid stopping the stream at" failed to apply to 5.10-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 257d2d7e9e798305d65825cb82b0a7d1c0511e89 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Sat, 6 Feb 2021 21:30:52 +0100
Subject: [PATCH] ALSA: usb-audio: Don't avoid stopping the stream at
 disconnection

In the later patch, we're going to issue the PCM sync_stop calls at
disconnection.  But currently the USB-audio driver can't handle it
because it has a check of shutdown flag for stopping the URBs.  This
is basically superfluous (the stopping URBs are safe at disconnection
state), so let's drop the check.

Fixes: dc5eafe7787c ("ALSA: usb-audio: Support PCM sync_stop")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210206203052.15606-4-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 4390075b2c6f..102d53515a76 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -890,9 +890,6 @@ static int stop_urbs(struct snd_usb_endpoint *ep, bool force)
 {
 	unsigned int i;
 
-	if (!force && atomic_read(&ep->chip->shutdown)) /* to be sure... */
-		return -EBADFD;
-
 	if (!force && atomic_read(&ep->running))
 		return -EBUSY;
 
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index dcadf8f164b2..bf5a0f3c1fad 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -270,10 +270,7 @@ static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
 {
 	struct snd_usb_substream *subs = substream->runtime->private_data;
 
-	if (!snd_usb_lock_shutdown(subs->stream->chip)) {
-		sync_pending_stops(subs);
-		snd_usb_unlock_shutdown(subs->stream->chip);
-	}
+	sync_pending_stops(subs);
 	return 0;
 }