[linux-dvb] only one read access to cx88-devices possible

[Oliver Endriss]

Fabian Förg wrote:
> Hello,
> 
> I realized that only one read access is possible to devices that use the 
> cx88 driver.
> In my case it is a Hauppauge WinTV Nova-S-Plus DVB-S card.
> You can reproduce it with the following test:
> Launch femon concurrently two or more times. Only one femon is able to 
> read from the card.
> Oliver Endriss confirmed that bug after looking in cx88-dvb.c.
> Usually, only one write access but an arbitrary amount of read accesses 
> should be allowed.

Basically it's a bug in dvb_frontend.
ts_bus_ctrl() should only be called by
- the first open
- the last release
call.

Please try the attached patch.

@all:
Ok?

CU
Oliver

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