From ae6cfaace120f4330715b56265ce0e4a710e1276 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Sat, 14 Mar 2009 08:28:45 -0300 Subject: V4L/DVB (11044): v4l2-device: add v4l2_device_disconnect Call v4l2_device_disconnect when the parent of a hotpluggable device disconnects. This ensures that you do not have a pointer to a device that is no longer present. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- include/media/v4l2-device.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'include/media') diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h index 3d8e96f6ceb3..0dd3e8e8653e 100644 --- a/include/media/v4l2-device.h +++ b/include/media/v4l2-device.h @@ -53,7 +53,11 @@ struct v4l2_device { dev may be NULL in rare cases (ISA devices). In that case you must fill in the v4l2_dev->name field before calling this function. */ int __must_check v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev); -/* Set v4l2_dev->dev->driver_data to NULL and unregister all sub-devices */ +/* Set v4l2_dev->dev to NULL. Call when the USB parent disconnects. + Since the parent disappears this ensures that v4l2_dev doesn't have an + invalid parent pointer. */ +void v4l2_device_disconnect(struct v4l2_device *v4l2_dev); +/* Unregister all sub-devices and any other resources related to v4l2_dev. */ void v4l2_device_unregister(struct v4l2_device *v4l2_dev); /* Register a subdev with a v4l2 device. While registered the subdev module -- cgit v1.2.3