2008/3/29 Janne Grunau <janne-dvb@xxxxxxxxx>:
> Hi,
>
> I resubmit this patch since I still think it is a good idea to the this
> driver option. There is still no udev recipe to guaranty stable dvb
> adapter numbers. I've tried to come up with some rules but it's tricky
> due to the multiple device nodes in a subdirectory. I won't claim that
> it is impossible to get udev to assign driver or hardware specific
> stable dvb adapter numbers but I think this patch is easier and more
> clean than a udev based solution.
>
> I'll drop this patch if a simple udev solution is found in a reasonable
> amount of time. But if there is no I would like to see the attached
> patch merged.
>
> Quoting myself for a short desciprtion for the patch:
>
> > V4L drivers have the {radio|vbi|video}_nr module options to allocate
> > static minor numbers per driver.
> >
> > Attached patch adds a similiar mechanism to the dvb subsystem. To
> > avoid problems with device unplugging and repluging each driver holds
> > a DVB_MAX_ADAPTER long array of the preffered order of adapter
> > numbers.
> >
> > options dvb-usb-dib0700 adapter_nr=7,6,5,4,3,2,1,0 would result in a
> > reversed allocation of adapter numbers.
> >
> > With adapter_nr=2,5 it tries first to get adapter number 2 and 5. If
> > both are already in use it will allocate the lowest free adapter
> > number.
Personally, I would love to see this merged -- I hope that others will
agree with me.
One critique:
videobuf-dvb is more of a central helper module. I believe that the
module option should live in the callers of videobuf-dvb (such as
cx88-dvb / saa7134-dvb / cx23885-dvb) rather than within the
videobuf-dvb module, itself. The array can be passed into
videobuf-dvb the same as was done with dvb-usb-dvb.c
Other than that, I think that this feature would be a valuable
addition to the DVB subsystem.
-Mike Krufky
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