FAILED: patch "[PATCH] ALSA: wavefront: Clear substream pointers on close" failed to apply to 5.10-stable tree

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 <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x e11c5c13ce0ab2325d38fe63500be1dd88b81e38
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2025121601-suffrage-senate-99ab@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

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

From e11c5c13ce0ab2325d38fe63500be1dd88b81e38 Mon Sep 17 00:00:00 2001
From: Junrui Luo <[email protected]>
Date: Thu, 6 Nov 2025 10:24:57 +0800
Subject: [PATCH] ALSA: wavefront: Clear substream pointers on close

Clear substream pointers in close functions to avoid leaving dangling pointers, helping to improve code safety and
prevents potential issues.

index 1250ecba659a..69d87c4cafae 100644
@@ -278,6 +278,7 @@ static int snd_wavefront_midi_input_close(struct snd_rawmidi_substream *substrea
 	        return -EIO;
 
 	guard(spinlock_irqsave)(&midi->open);
+	midi->substream_input[mpu] = NULL;
 	midi->mode[mpu] &= ~MPU401_MODE_INPUT;
 
 	return 0;

@@ -300,6 +301,7 @@ static int snd_wavefront_midi_output_close(struct snd_rawmidi_substream *substre
 	        return -EIO;
 
 	guard(spinlock_irqsave)(&midi->open);
+	midi->substream_output[mpu] = NULL;
 	midi->mode[mpu] &= ~MPU401_MODE_OUTPUT;
 	return 0;
 }

From: Junrui Luo <[email protected]>

[ Upstream commit e11c5c13ce0ab2325d38fe63500be1dd88b81e38 ]

Clear substream pointers in close functions to avoid leaving dangling pointers, helping to improve code safety and
prevents potential issues.

---
 sound/isa/wavefront/wavefront_midi.c | 2 ++
 1 file changed, 2 insertions(+)

index a337a86f7a65f..049ff37382e7e 100644
@@ -291,6 +291,7 @@ static int snd_wavefront_midi_input_close(struct snd_rawmidi_substream *substrea
 	        return -EIO;
 
 	spin_lock_irqsave (&midi->open, flags);
+	midi->substream_input[mpu] = NULL;
 	midi->mode[mpu] &= ~MPU401_MODE_INPUT;
 	spin_unlock_irqrestore (&midi->open, flags);
 

@@ -314,6 +315,7 @@ static int snd_wavefront_midi_output_close(struct snd_rawmidi_substream *substre
 	        return -EIO;
 
 	spin_lock_irqsave (&midi->open, flags);
+	midi->substream_output[mpu] = NULL;
 	midi->mode[mpu] &= ~MPU401_MODE_OUTPUT;
 	spin_unlock_irqrestore (&midi->open, flags);
 	return 0;

2.51.0