This is the second attempt at moving priority handling into the core.
I have added two helper functions that allocate and free just a single
v4l2_fh struct. This can be used by drivers that do not need to embed the
struct v4l2_fh into a larger struct.
It is also called by the core for any driver that does not supply open()
or release() callbacks in struct v4l2_file_operations. This replaces the
awkward 'store priority in private_data' hack from the previous patch
series.
This means that almost all radio devices automatically support priority
handling (since most do not supply open/release).
This patch series also converts radio-mr800 (removing the bogus autopm
support allows us to remove the open/release support) and radio-cadet
(typical first-time open and close code, shows how easy it is to use
the helper functions).
ivtv is also converted as it is currently the only driver that embeds
struct v4l2_fh.
Core support for priority handling is necessary in order to have consistent
handling of priorities and to handle priorities and the control framework.
A lot of video drivers do something in open and/or release, so it is quite
a bit of work to implement this. However, the changes needed to convert a
driver are trivial and are easy to review.
Comments are welcome!
Regards,
Hans
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