queue-6.1/alsa-pcxhr-initialize-mutexes-before-requesting-threaded-irq.patch

From 6c97817e20598e5473094e0e38d1f51f1cf4dfff Mon Sep 17 00:00:00 2001
From: Runyu Xiao <runyu.xiao@seu.edu.cn>
Date: Tue, 18 Aug 2026 22:47:17 +0800
Subject: ALSA: pcxhr: initialize mutexes before requesting threaded IRQ

From: Runyu Xiao <runyu.xiao@seu.edu.cn>

commit 6c97817e20598e5473094e0e38d1f51f1cf4dfff upstream.

pcxhr_probe() requests pcxhr_threaded_irq() before initializing
mgr->lock, even though the threaded handler takes that mutex.

Initialize the manager locks before request_threaded_irq() so an
early interrupt cannot run against uninitialized mutex state during
probe.

Fixes: 9bef72bdb26e ("ALSA: pcxhr: Use nonatomic PCM ops")
Cc: stable@vger.kernel.org
Signed-off-by: Runyu Xiao <runyu.xiao@seu.edu.cn>
Link: https://patch.msgid.link/20260818144717.2269918-1-runyu.xiao@seu.edu.cn
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 sound/pci/pcxhr/pcxhr.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/sound/pci/pcxhr/pcxhr.c
+++ b/sound/pci/pcxhr/pcxhr.c
@@ -1551,6 +1551,13 @@ static int pcxhr_probe(struct pci_dev *p
 	mgr->pci = pci;
 	mgr->irq = -1;
 
+	/* ISR lock  */
+	mutex_init(&mgr->lock);
+	mutex_init(&mgr->msg_lock);
+
+	/* init setup mutex*/
+	mutex_init(&mgr->setup_mutex);
+
 	if (request_threaded_irq(pci->irq, pcxhr_interrupt,
 				 pcxhr_threaded_irq, IRQF_SHARED,
 				 KBUILD_MODNAME, mgr)) {
@@ -1564,13 +1571,6 @@ static int pcxhr_probe(struct pci_dev *p
 		 "Digigram at 0x%lx & 0x%lx, 0x%lx irq %i",
 		 mgr->port[0], mgr->port[1], mgr->port[2], mgr->irq);
 
-	/* ISR lock  */
-	mutex_init(&mgr->lock);
-	mutex_init(&mgr->msg_lock);
-
-	/* init setup mutex*/
-	mutex_init(&mgr->setup_mutex);
-
 	mgr->prmh = kmalloc(sizeof(*mgr->prmh) +
 			    sizeof(u32) * (PCXHR_SIZE_MAX_LONG_STATUS -
 					   PCXHR_SIZE_MAX_STATUS),