[PATCH v2 1/2] leds: rgb: s2m: Wire up of_match_table in platform driver

[kr494167@gmail.com]

From: Surendra <kr494167@gmail.com>

The driver defines and registers s2m_rgb_of_match_table via
MODULE_DEVICE_TABLE(of, ...) but never assigns it to the platform
driver's .of_match_table field. As a result, the kernel never matches
this driver against a DT node with compatible "samsung,s2mu005-rgb",
making the MODULE_DEVICE_TABLE entry dead code.

Wire the table up so that DT-based probing and module auto-loading
work as intended. In addition, validate dev->parent in s2m_rgb_probe()
to prevent a NULL pointer dereference if probed without parent driver data.

Fixes: 63ccd117f425 ("leds: rgb: Add support for Samsung S2M series PMIC RGB LED device")
Signed-off-by: Surendra <kr494167@gmail.com>
---
 drivers/leds/rgb/leds-s2m-rgb.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/rgb/leds-s2m-rgb.c b/drivers/leds/rgb/leds-s2m-rgb.c
index d239f54eee90..7ac2b1160c1e 100644
--- a/drivers/leds/rgb/leds-s2m-rgb.c
+++ b/drivers/leds/rgb/leds-s2m-rgb.c
@@ -363,11 +363,18 @@ static const struct mc_subled s2mu005_rgb_subled_info[] = {
 static int s2m_rgb_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct sec_pmic_dev *pmic_drvdata = dev_get_drvdata(dev->parent);
+	struct sec_pmic_dev *pmic_drvdata;
 	struct s2m_rgb *rgb;
 	struct led_init_data init_data = {};
 	int ret;
 
+	if (!dev->parent)
+		return -ENODEV;
+
+	pmic_drvdata = dev_get_drvdata(dev->parent);
+	if (!pmic_drvdata)
+		return -ENODEV;
+
 	rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
 	if (!rgb)
 		return -ENOMEM;
@@ -415,6 +422,7 @@ MODULE_DEVICE_TABLE(of, s2m_rgb_of_match_table);
 static struct platform_driver s2m_rgb_driver = {
 	.driver = {
 		.name = "s2m-rgb",
+		.of_match_table = s2m_rgb_of_match_table,
 	},
 	.probe = s2m_rgb_probe,
 	.id_table = s2m_rgb_id_table,
-- 
2.55.0