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SubjectRe: [v4l-dvb-maintainer] [patch, -git] drivers/media build fix fo r modular builds
Date
Trent Piepho wrote:
> On Wed, 30 Apr 2008, Andrew Morton wrote:
>
>> Does this make it feel better?
>>
>> --- a/drivers/media/video/tuner-core.c~a
>> +++ a/drivers/media/video/tuner-core.c
>> @@ -40,11 +40,11 @@
>> typeof(&FUNCTION) __a = symbol_request(FUNCTION); \
>> if (__a) { \
>> __r = (int) __a(ARGS); \
>> + symbol_put(FUNCTION); \
>> } else { \
>> printk(KERN_ERR "TUNER: Unable to find " \
>> "symbol "#FUNCTION"()\n"); \
>> } \
>> - symbol_put(FUNCTION); \
>> __r; \
>> })
>>
>
> Should the symbol_put be done at all? When I wrote the code this is based
> on, it would check if FUNCTION failed or not. If it failed, the symbol
was
> put. But if it worked, then one was returned a handle into FUNCTION's
> module, and so the symbol was not put. If it was, the module's refcount
> would be zero but the caller would have a handle into the module.
>
> So if FUNCTION does anything that creates references to the module, and it
> doesn't inc it's own refcount, then the symbol_put shouldn't be done.
>
>
Trent,

The symbol_put is correct in this case. This macro above is called
"tuner_symbol_probe" , used only within tuner-core.c

This macro is used to call the probe function of a tuner sub-module
(tea5761, tea5767, tda8290). Regardless of whether the probe succeeds
or fails, we do the symbol_put. If the probe succeeds, tuner-core will
proceed to dvb_attach(that_tuner_attach, params), which does the actual
module use count increase.

Regards,

Mike


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