FAILED: patch "[PATCH] ASoC: wcd934x: fix error handling in" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.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 4e65bda8273c938039403144730923e77916a3d7
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025101305-until-selector-fc19@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From 4e65bda8273c938039403144730923e77916a3d7 Mon Sep 17 00:00:00 2001
From: Ma Ke <make24@iscas.ac.cn>
Date: Tue, 23 Sep 2025 14:52:12 +0800
Subject: [PATCH] ASoC: wcd934x: fix error handling in
 wcd934x_codec_parse_data()

wcd934x_codec_parse_data() contains a device reference count leak in
of_slim_get_device() where device_find_child() increases the reference
count of the device but this reference is not properly decreased in
the success path. Add put_device() in wcd934x_codec_parse_data() and
add devm_add_action_or_reset() in the probe function, which ensures
that the reference count of the device is correctly managed.

Memory leak in regmap_init_slimbus() as the allocated regmap is not
released when the device is removed. Using devm_regmap_init_slimbus()
instead of regmap_init_slimbus() to ensure automatic regmap cleanup on
device removal.

Calling path: of_slim_get_device() -> of_find_slim_device() ->
device_find_child(). As comment of device_find_child() says, 'NOTE:
you will need to drop the reference with put_device() after use.'.

Found by code review.

Cc: stable@vger.kernel.org
Fixes: a61f3b4f476e ("ASoC: wcd934x: add support to wcd9340/wcd9341 codec")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://patch.msgid.link/20250923065212.26660-1-make24@iscas.ac.cn
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/wcd934x.c b/sound/soc/codecs/wcd934x.c
index 1bb7e1dc7e6b..e92939068bf7 100644
--- a/sound/soc/codecs/wcd934x.c
+++ b/sound/soc/codecs/wcd934x.c
@@ -5831,6 +5831,13 @@ static const struct snd_soc_component_driver wcd934x_component_drv = {
 	.endianness = 1,
 };
 
+static void wcd934x_put_device_action(void *data)
+{
+	struct device *dev = data;
+
+	put_device(dev);
+}
+
 static int wcd934x_codec_parse_data(struct wcd934x_codec *wcd)
 {
 	struct device *dev = &wcd->sdev->dev;
@@ -5847,11 +5854,13 @@ static int wcd934x_codec_parse_data(struct wcd934x_codec *wcd)
 		return dev_err_probe(dev, -EINVAL, "Unable to get SLIM Interface device\n");
 
 	slim_get_logical_addr(wcd->sidev);
-	wcd->if_regmap = regmap_init_slimbus(wcd->sidev,
+	wcd->if_regmap = devm_regmap_init_slimbus(wcd->sidev,
 				  &wcd934x_ifc_regmap_config);
-	if (IS_ERR(wcd->if_regmap))
+	if (IS_ERR(wcd->if_regmap)) {
+		put_device(&wcd->sidev->dev);
 		return dev_err_probe(dev, PTR_ERR(wcd->if_regmap),
 				     "Failed to allocate ifc register map\n");
+	}
 
 	of_property_read_u32(dev->parent->of_node, "qcom,dmic-sample-rate",
 			     &wcd->dmic_sample_rate);
@@ -5893,6 +5902,10 @@ static int wcd934x_codec_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	ret = devm_add_action_or_reset(dev, wcd934x_put_device_action, &wcd->sidev->dev);
+	if (ret)
+		return ret;
+
 	/* set default rate 9P6MHz */
 	regmap_update_bits(wcd->regmap, WCD934X_CODEC_RPM_CLK_MCLK_CFG,
 			   WCD934X_CODEC_RPM_CLK_MCLK_CFG_MCLK_MASK,