New subject: [PATCH 5.15.y 1/6] ASoC: stm: Use dev_err_probe() helper

5 Jan 2026

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 23261f0de09427367e99f39f588e31e2856a690e
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to 'stable@vger.kernel.org' --in-reply-to '2026010551-backpedal-chatroom-a9c7@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 23261f0de09427367e99f39f588e31e2856a690e Mon Sep 17 00:00:00 2001
From: Johan Hovold johan@kernel.org
Date: Mon, 24 Nov 2025 11:49:07 +0100
Subject: [PATCH] ASoC: stm32: sai: fix OF node leak on probe
The reference taken to the sync provider OF node when probing the
platform device is currently only dropped if the set_sync() callback
fails during DAI probe.
Make sure to drop the reference on platform probe failures (e.g. probe
deferral) and on driver unbind.
This also avoids a potential use-after-free in case the DAI is ever
reprobed without first rebinding the platform driver.
Fixes: 5914d285f6b7 ("ASoC: stm32: sai: Add synchronization support")
Fixes: d4180b4c02e7 ("ASoC: stm32: sai: fix set_sync service")
Cc: Olivier Moysan olivier.moysan@st.com
Cc: stable@vger.kernel.org      # 4.16: d4180b4c02e7
Signed-off-by: Johan Hovold johan@kernel.org
Reviewed-by: olivier moysan olivier.moysan@foss.st.com
Link: https://patch.msgid.link/20251124104908.15754-4-johan@kernel.org
Signed-off-by: Mark Brown broonie@kernel.org

diff --git a/sound/soc/stm/stm32_sai.c b/sound/soc/stm/stm32_sai.c
index 7065aeb0e524..00cf24ceca2d 100644
--- a/sound/soc/stm/stm32_sai.c
+++ b/sound/soc/stm/stm32_sai.c
@@ -138,7 +138,6 @@ static int stm32_sai_set_sync(struct stm32_sai_data *sai_client,
    if (!pdev) {
    	dev_err(&sai_client->pdev->dev,
    		"Device not found for node %pOFn\n", np_provider);
-		of_node_put(np_provider);
    	return -ENODEV;
    }
@@ -147,21 +146,16 @@ static int stm32_sai_set_sync(struct stm32_sai_data *sai_client,
    if (!sai_provider) {
    	dev_err(&sai_client->pdev->dev,
    		"SAI sync provider data not found\n");
-		ret = -EINVAL;
-		goto error;
+		return -EINVAL;
    }
/* Configure sync client */
    ret = stm32_sai_sync_conf_client(sai_client, synci);
    if (ret < 0)
-		goto error;
+		return ret;
/* Configure sync provider */
-	ret = stm32_sai_sync_conf_provider(sai_provider, synco);
-
-error:
-	of_node_put(np_provider);
-	return ret;
+	return stm32_sai_sync_conf_provider(sai_provider, synco);
 }
static int stm32_sai_get_parent_clk(struct stm32_sai_data *sai)
diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index 7a005b4ad304..5ae4d2577f28 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -1586,7 +1586,8 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
    			dev_err(&pdev->dev,
    				"External synchro not supported\n");
    			of_node_put(args.np);
-				return -EINVAL;
+				ret = -EINVAL;
+				goto err_put_sync_provider;
    		}
    		sai->sync = SAI_SYNC_EXTERNAL;
@@ -1595,7 +1596,8 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
    		    (sai->synci > (SAI_GCR_SYNCIN_MAX + 1))) {
    			dev_err(&pdev->dev, "Wrong SAI index\n");
    			of_node_put(args.np);
-				return -EINVAL;
+				ret = -EINVAL;
+				goto err_put_sync_provider;
    		}
if (of_property_match_string(args.np, "compatible",
@@ -1609,7 +1611,8 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
    		if (!sai->synco) {
    			dev_err(&pdev->dev, "Unknown SAI sub-block\n");
    			of_node_put(args.np);
-				return -EINVAL;
+				ret = -EINVAL;
+				goto err_put_sync_provider;
    		}
    	}
@@ -1619,13 +1622,15 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
of_node_put(args.np);
    sai->sai_ck = devm_clk_get(&pdev->dev, "sai_ck");
-	if (IS_ERR(sai->sai_ck))
-		return dev_err_probe(&pdev->dev, PTR_ERR(sai->sai_ck),
-				     "Missing kernel clock sai_ck\n");
+	if (IS_ERR(sai->sai_ck)) {
+		ret = dev_err_probe(&pdev->dev, PTR_ERR(sai->sai_ck),
+				    "Missing kernel clock sai_ck\n");
+		goto err_put_sync_provider;
+	}
ret = clk_prepare(sai->pdata->pclk);
    if (ret < 0)
-		return ret;
+		goto err_put_sync_provider;
if (STM_SAI_IS_F4(sai->pdata))
    	return 0;
@@ -1647,6 +1652,8 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
err_unprepare_pclk:
    clk_unprepare(sai->pdata->pclk);
+err_put_sync_provider:
+	of_node_put(sai->np_sync_provider);
return ret;
 }
@@ -1720,6 +1727,7 @@ static int stm32_sai_sub_probe(struct platform_device *pdev)
err_unprepare_pclk:
    clk_unprepare(sai->pdata->pclk);
+	of_node_put(sai->np_sync_provider);
return ret;
 }
@@ -1732,6 +1740,7 @@ static void stm32_sai_sub_remove(struct platform_device *pdev)
    snd_dmaengine_pcm_unregister(&pdev->dev);
    snd_soc_unregister_component(&pdev->dev);
    pm_runtime_disable(&pdev->dev);
+	of_node_put(sai->np_sync_provider);
 }
static int stm32_sai_sub_suspend(struct device *dev)

    

FAILED: patch "[PATCH] ASoC: stm32: sai: fix OF node leak on probe" failed to apply to 5.15-stable tree