V4L/DVB (10252): v4l2 doc: explain why v4l2_device_unregister_subdev() has to be called.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Родитель
6ca187abb2
Коммит
f5360bdc55
|
@ -340,6 +340,12 @@ Make sure to call v4l2_device_unregister_subdev(sd) when the remove() callback
|
|||
is called. This will unregister the sub-device from the bridge driver. It is
|
||||
safe to call this even if the sub-device was never registered.
|
||||
|
||||
You need to do this because when the bridge driver destroys the i2c adapter
|
||||
the remove() callbacks are called of the i2c devices on that adapter.
|
||||
After that the corresponding v4l2_subdev structures are invalid, so they
|
||||
have to be unregistered first. Calling v4l2_device_unregister_subdev(sd)
|
||||
from the remove() callback ensures that this is always done correctly.
|
||||
|
||||
|
||||
The bridge driver also has some helper functions it can use:
|
||||
|
||||
|
|
Загрузка…
Ссылка в новой задаче