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media: Documentation: v4l: Document v4l2_async_nf_cleanup

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Document v4l2_async_nf_cleanup() which must be called before releasing an
unregistered notifier's memory. Also remove the sentence regarding
v4l2_async_nf_init() arguments --- those are documented in kerneldoc which
is referred here.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> # Renesas RZ/G2L SMARC
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Sakari Ailus 2023-06-20 13:26:53 +02:00 committed by Mauro Carvalho Chehab
parent 95a188168b
commit f60eccb04a
1 changed files with 5 additions and 6 deletions
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11
Documentation/driver-api/media/v4l2-subdev.rst
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@ -198,12 +198,11 @@ picked up by bridge drivers.
Asynchronous sub-device notifiers
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Bridge drivers in turn have to register a notifier object. This is
performed using the :c:func:`v4l2_async_nf_register` call. To
unregister the notifier the driver has to call
:c:func:`v4l2_async_nf_unregister`. The former of the two functions
takes two arguments: a pointer to struct :c:type:`v4l2_device` and a
pointer to struct :c:type:`v4l2_async_notifier`.
Bridge drivers in turn have to register a notifier object. This is performed
using the :c:func:`v4l2_async_nf_register` call. To unregister the notifier the
driver has to call :c:func:`v4l2_async_nf_unregister`. Before releasing memory
of an unregister notifier, it must be cleaned up by calling
:c:func:`v4l2_async_nf_cleanup`.
Before registering the notifier, bridge drivers must do two things: first, the
notifier must be initialized using the :c:func:`v4l2_async_nf_init`. Second,