From 0d51ebd3f41f195e33ed8d9b9d67ed90f6e298ec Mon Sep 17 00:00:00 2001 From: Tommi Franttila Date: Thu, 12 Nov 2015 07:01:07 -0200 Subject: [PATCH] [media] v4l2-device: Don't unregister ACPI/Device Tree based devices When a V4L2 sub-device backed by a DT or ACPI based device was removed, the device was unregistered as well which certainly was not intentional, as the client device would not be re-created by simply reinstating the V4L2 sub-device (indeed the device would have to be there first!). Skip unregistering the device in case it has non-NULL of_node or fwnode. Signed-off-by: Tommi Franttila Signed-off-by: Sakari Ailus Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/v4l2-core/v4l2-device.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/drivers/media/v4l2-core/v4l2-device.c b/drivers/media/v4l2-core/v4l2-device.c index 5b0a30b9252b..7129e438f29e 100644 --- a/drivers/media/v4l2-core/v4l2-device.c +++ b/drivers/media/v4l2-core/v4l2-device.c @@ -118,11 +118,20 @@ void v4l2_device_unregister(struct v4l2_device *v4l2_dev) if (sd->flags & V4L2_SUBDEV_FL_IS_I2C) { struct i2c_client *client = v4l2_get_subdevdata(sd); - /* We need to unregister the i2c client explicitly. - We cannot rely on i2c_del_adapter to always - unregister clients for us, since if the i2c bus - is a platform bus, then it is never deleted. */ - if (client) + /* + * We need to unregister the i2c client + * explicitly. We cannot rely on + * i2c_del_adapter to always unregister + * clients for us, since if the i2c bus is a + * platform bus, then it is never deleted. + * + * Device tree or ACPI based devices must not + * be unregistered as they have not been + * registered by us, and would not be + * re-created by just probing the V4L2 driver. + */ + if (client && + !client->dev.of_node && !client->dev.fwnode) i2c_unregister_device(client); continue; } @@ -131,7 +140,7 @@ void v4l2_device_unregister(struct v4l2_device *v4l2_dev) if (sd->flags & V4L2_SUBDEV_FL_IS_SPI) { struct spi_device *spi = v4l2_get_subdevdata(sd); - if (spi) + if (spi && !spi->dev.of_node && !spi->dev.fwnode) spi_unregister_device(spi); continue; } -- 2.34.1