[PATCH v2 0/1] media: i2c: ov5648: Fix lockdep error

[PATCH v2 0/1] media: i2c: ov5648: Fix lockdep error

[Hans de Goede]

Hi,

This patch seems to have fallen through the cracks, so I'm
resending it.

Regards,

Hans


Hans de Goede (1):
  media: i2c: ov5648: Fix lockdep error

 drivers/media/i2c/ov5648.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

-- 
2.33.1

[PATCH v2 1/1] media: i2c: ov5648: Fix lockdep error

[Hans de Goede]

ov5648_state_init() calls ov5648_state_mipi_configure() which uses
__v4l2_ctrl_s_ctrl[_int64](). This means that sensor->mutex (which
is also sensor->ctrls.handler.lock) must be locked before calling
ov5648_state_init().

ov5648_state_mipi_configure() is also used in other places where
the lock is already held so it cannot be changed itself.

Note this is based on an identical (tested) fix for the ov8865 driver,
this has only been compile-tested.

Cc: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
- Move the taking of the mutex to inside ov5648_state_init()
---
 drivers/media/i2c/ov5648.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/ov5648.c b/drivers/media/i2c/ov5648.c
index 947d437ed0ef..01e22c535267 100644
--- a/drivers/media/i2c/ov5648.c
+++ b/drivers/media/i2c/ov5648.c
@@ -1778,8 +1778,14 @@ static int ov5648_state_configure(struct ov5648_sensor *sensor,
 
 static int ov5648_state_init(struct ov5648_sensor *sensor)
 {
-	return ov5648_state_configure(sensor, &ov5648_modes[0],
-				      ov5648_mbus_codes[0]);
+	int ret;
+
+	mutex_lock(&sensor->mutex);
+	ret = ov5648_state_configure(sensor, &ov5648_modes[0],
+				     ov5648_mbus_codes[0]);
+	mutex_unlock(&sensor->mutex);
+
+	return ret;
 }
 
 /* Sensor Base */
-- 
2.33.1