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media: v4l2-async: Document asd allocation requirements
The v4l2_async_notifier_add_subdev() function requires the asd pointer
it receives to be allocated dynamically, but doesn't explicitly say so.
Only one driver out of 13 get its right (atmel-sama5d2-isc.c, but with
memory leaks in the error paths), clearly showing we have an issue.
Update the v4l2_async_notifier_add_subdev() documentation to clearly
state the allocation requirement. Whether this will be enough to avoid
new offending code isn't certain, but it's a good first step
nonetheless.
Fixes: 9ca4653121
("media: v4l: fwnode: Support generic parsing of graph endpoints in a device")
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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1 changed files with 3 additions and 2 deletions
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@ -154,8 +154,9 @@ void v4l2_async_notifier_init(struct v4l2_async_notifier *notifier);
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* @notifier: pointer to &struct v4l2_async_notifier
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* @asd: pointer to &struct v4l2_async_subdev
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*
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* Call this function before registering a notifier to link the
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* provided asd to the notifiers master @asd_list.
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* Call this function before registering a notifier to link the provided @asd to
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* the notifiers master @asd_list. The @asd must be allocated with k*alloc() as
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* it will be freed by the framework when the notifier is destroyed.
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*/
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int v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier,
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struct v4l2_async_subdev *asd);
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