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authorHans Verkuil <hverkuil@xs4all.nl>2009-03-14 08:28:45 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-03-30 12:43:22 -0300
commitae6cfaace120f4330715b56265ce0e4a710e1276 (patch)
treeed01c11218132e92ce8fe4872fe26c572c3c8842 /include/media
parent6273fda6e32e2cd9a478545d0cbc15ac497b1f4b (diff)
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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 <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'include/media')
-rw-r--r--include/media/v4l2-device.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h
index 3d8e96f6ceb..0dd3e8e8653 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