media: ov2740: identify module after subdev initialisation

The module identifying will try to get the sub device data which
will be ready after sub device initialisation, so if try to use the
subdev data to deference the client will cause NULL pointer
dereference, this patch move the module identification after
v4l2_i2c_subdev_init() to fix this issue, it also fixes duplicate
module idendification.

Fixes: ada2c4f54d0a ("media: ov2740: support device probe in non-zero ACPI D state")
Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

diff --git a/drivers/media/i2c/ov2740.c b/drivers/media/i2c/ov2740.c
index bab720c..d5f0eab 100644 (file)
--- a/drivers/media/i2c/ov2740.c
+++ b/drivers/media/i2c/ov2740.c
@@ -1162,6 +1162,7 @@ static int ov2740_probe(struct i2c_client *client)
        if (!ov2740)
                return -ENOMEM;
 
+       v4l2_i2c_subdev_init(&ov2740->sd, client, &ov2740_subdev_ops);
        full_power = acpi_dev_state_d0(&client->dev);
        if (full_power) {
                ret = ov2740_identify_module(ov2740);
@@ -1171,13 +1172,6 @@ static int ov2740_probe(struct i2c_client *client)
                }
        }
 
-       v4l2_i2c_subdev_init(&ov2740->sd, client, &ov2740_subdev_ops);
-       ret = ov2740_identify_module(ov2740);
-       if (ret) {
-               dev_err(&client->dev, "failed to find sensor: %d", ret);
-               return ret;
-       }
-
        mutex_init(&ov2740->mutex);
        ov2740->cur_mode = &supported_modes[0];
        ret = ov2740_init_controls(ov2740);