media: v4l2-subdev: Document and enforce .s_stream() requirements

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The subdev .s_stream() operation must not be called to start an already
started subdev, or stop an already stopped one. This requirement has
never been formally documented. Fix it, and catch possible offenders
with a WARN_ON() in the call_s_stream() wrapper.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

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Laurent Pinchart 2023-09-18 15:48:38 +03:00 • committed by Hans Verkuil

parent 397b2a25b8

commit 009905ec50

2 changed files with 19 additions and 2 deletions

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17

drivers/media/v4l2-core/v4l2-subdev.c

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4

include/media/v4l2-subdev.h

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