FAILED: patch "[PATCH] ASoC: stm: stm32_i2s: request IRQ after regmap initialization" failed to apply to 5.15-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 5.15-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>.

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-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 1b207c85551fd74854d632116849295b2305245f
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107060220-failed-5.15-1b207c85551f@kernel.org' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Thanks,
Sasha

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

From 1b207c85551fd74854d632116849295b2305245f Mon Sep 17 00:00:00 2001
From: Myeonghun Pak <mhun512@gmail.com>
Date: Sun, 4 Oct 2026 00:34:51 -0400
Subject: [PATCH] ASoC: stm: stm32_i2s: request IRQ after regmap initialization

The ISR accesses the managed regmap, but probe requests the IRQ before
creating it. An early interrupt can reach an uninitialized regmap.
Reverse-order cleanup can free the regmap while the IRQ remains active.

Request the IRQ after regmap initialization so probe unwind and
removal free and synchronize it before releasing the regmap.

The teardown ordering issue was found by static analysis.

Fixes: e4e6ec7b127c ("ASoC: stm32: Add I2S driver")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Co-developed-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Myeonghun Pak <mhun512@gmail.com>
Link: https://patch.msgid.link/20261004043451.1138613-1-mhun512@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/stm/stm32_i2s.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/sound/soc/stm/stm32_i2s.c b/sound/soc/stm/stm32_i2s.c
index a59ad94423726..22196f789ae4a 100644
--- a/sound/soc/stm/stm32_i2s.c
+++ b/sound/soc/stm/stm32_i2s.c
@@ -1197,7 +1197,7 @@ static int stm32_i2s_parse_dt(struct platform_device *pdev,
 	struct device_node *np = pdev->dev.of_node;
 	struct reset_control *rst;
 	struct resource *res;
-	int irq, ret;
+	int ret;
 
 	if (!np)
 		return -ENODEV;
@@ -1243,16 +1243,6 @@ static int stm32_i2s_parse_dt(struct platform_device *pdev,
 			return ret;
 	}
 
-	/* Get irqs */
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return irq;
-
-	ret = devm_request_irq(&pdev->dev, irq, stm32_i2s_isr, 0,
-			       dev_name(&pdev->dev), i2s);
-	if (ret)
-		return ret;
-
 	/* Reset */
 	rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
 	if (IS_ERR(rst))
@@ -1277,7 +1267,7 @@ static int stm32_i2s_probe(struct platform_device *pdev)
 {
 	struct stm32_i2s_data *i2s;
 	u32 val;
-	int ret;
+	int irq, ret;
 
 	i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
 	if (!i2s)
@@ -1303,6 +1293,15 @@ static int stm32_i2s_probe(struct platform_device *pdev)
 		return dev_err_probe(&pdev->dev, PTR_ERR(i2s->regmap),
 				     "Regmap init error\n");
 
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	ret = devm_request_irq(&pdev->dev, irq, stm32_i2s_isr, 0,
+			       dev_name(&pdev->dev), i2s);
+	if (ret)
+		return ret;
+
 	ret = snd_dmaengine_pcm_register(&pdev->dev, &stm32_i2s_pcm_config, 0);
 	if (ret)
 		return ret;
-- 
2.53.0