[linux-dvb] [PATCH] add device node locking possibility to dvbcore

Steven Toth stoth at hauppauge.com
Thu Aug 9 18:33:44 CEST 2007

Markus Rechberger wrote:
> Following patch adds a rather primitive way to temporary lock dvb 
> devicenodes, this can be useful for hybrid devices which use the 
> video4linux framework for the analogue TV part and the dvb framework for 
> digital TV if only one mode can be accessed at a time.
> Signed-off-by: Markus Rechberger <markus.rechberger at amd.com>
Call me dumb but I don't understand how this patch helps v4l devices. :)

Allocation/management of a single card resource doesn't belong inside 
the dvb framework, these answers need to come from the bridge-frameworks 
(via callbacks from dvb-core or the analog equivalent) who are better 
placed to make the decision about hybrid tuners, bus capacity or 
allocation, in use devices.

As a working example, I added similar support in my older HVR3000 tree 
where two frontends share a single transport bus. The code is old but it 
demonstrates a solution, much the my earlier patches for shared 
DVB/Blackbird boards also.

I understand how this patch helps the current dvb tree, it stops 
multiple people opening a device but that's it. ... Or, maybe I've just 
missed to point.

- Steve

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