[PATCH] media: i2c: dw9719: power down on detection errors

[Myeonghun Pak <mhun512@gmail.com>]

Moving chip detection into dw9719_power_up() introduced direct returns
after the regulator has been enabled. An INFO register read failure or an
unrecognized ID bypasses the power-down path, while probe only cleans up
the media entity and controls after a power-up error.

Route both detection errors through the existing power-down check. Preserve
the read error or -ENXIO and leave the successful power-up and regulator
enable failure paths unchanged.

This issue was identified during our ongoing static-analysis research while
reviewing kernel code.

Fixes: 2a1551665a85 ("media: dw9719: Add DW9761 support")
Cc: stable@vger.kernel.org
Assisted-by: OpenAI:GPT-5.6
Co-developed-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Myeonghun Pak <mhun512@gmail.com>
---
 drivers/media/i2c/dw9719.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/dw9719.c b/drivers/media/i2c/dw9719.c
index 3b7ba88fd..8a34abe18 100644
--- a/drivers/media/i2c/dw9719.c
+++ b/drivers/media/i2c/dw9719.c
@@ -150,7 +150,7 @@ static int dw9719_power_up(struct dw9719_device *dw9719, bool detect)
 
 		ret = cci_read(dw9719->regmap, DW9719_INFO, &val, NULL);
 		if (ret < 0)
-			return ret;
+			goto out;
 
 		switch (val) {
 		case DW9719_ID:
@@ -168,7 +168,8 @@ static int dw9719_power_up(struct dw9719_device *dw9719, bool detect)
 		default:
 			dev_err(dw9719->dev,
 				"Error unknown device id 0x%02llx\n", val);
-			return -ENXIO;
+			ret = -ENXIO;
+			goto out;
 		}
 
 props:
@@ -218,6 +219,7 @@ static int dw9719_power_up(struct dw9719_device *dw9719, bool detect)
 		cci_write(dw9719->regmap, DW9719_VCM_FREQ, dw9719->vcm_freq, &ret);
 	}
 
+out:
 	if (ret)
 		dw9719_power_down(dw9719);