linux-kernel - [PATCH v2] media: i2c: dw9714: Disable the regulator when the driver fails to probe

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Date:   Thu, 14 Apr 2022 10:34:35 +0800
From:   Zheyu Ma <zheyuma97@...il.com>
To:     sakari.ailus@...ux.intel.com, mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zheyu Ma <zheyuma97@...il.com>
Subject: [PATCH v2] media: i2c: dw9714: Disable the regulator when the driver fails to probe

When the driver fails to probe, we will get the following splat:

[   59.305988] ------------[ cut here ]------------
[   59.306417] WARNING: CPU: 2 PID: 395 at drivers/regulator/core.c:2257 _regulator_put+0x3ec/0x4e0
[   59.310345] RIP: 0010:_regulator_put+0x3ec/0x4e0
[   59.318362] Call Trace:
[   59.318582]  <TASK>
[   59.318765]  regulator_put+0x1f/0x30
[   59.319058]  devres_release_group+0x319/0x3d0
[   59.319420]  i2c_device_probe+0x766/0x940

Fix this by disabling the regulator in error handling.

Signed-off-by: Zheyu Ma <zheyuma97@...il.com>
---
 drivers/media/i2c/dw9714.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/i2c/dw9714.c b/drivers/media/i2c/dw9714.c
index cd7008ad8f2f..8c5797ba57d4 100644
--- a/drivers/media/i2c/dw9714.c
+++ b/drivers/media/i2c/dw9714.c
@@ -183,6 +183,7 @@ static int dw9714_probe(struct i2c_client *client)
 	return 0;
 
 err_cleanup:
+	regulator_disable(dw9714_dev->vcc);
 	v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm);
 	media_entity_cleanup(&dw9714_dev->sd.entity);
 
-- 
2.25.1