[linux-dvb] Doubt in file dvb-usb-dvb.c

Patrick Boettcher patrick.boettcher at desy.de
Fri Jul 27 12:17:49 CEST 2007


On Fri, 27 Jul 2007, lwtbenben wrote:

>  > if (adap->props.frontend_attach(adap) == 0 && adap->fe != NULL) 
>     When the first condition is checked, my_own_frontend_attach() function is called, using dvb_attach() macro to gain the adap->fe pointer, in my driver it is successful.
>     But my driver still can not register any frontend to the Linux DVB core, it must for the second condition, So I think maybe this state is unsuitable here.
>     Maybe should be something like this:
>     if(adap->props.frontend_attach(adap) == 0)
>         if(adap->fe != NULL)
>               .....................
> 
>     So what is your opinion?      
> 
> > it cannot enter this function? Why, because the compiler is checking 
> > adap->fe first?
>     
>     The reason is the second condition. Maybe Gcc compiler check the second condition first.

That would be crazy.

Patrick.

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