[patch] staging: comedi: cleanup comedi_recognize()

Ian Abbott abbotti at mev.co.uk
Wed Jun 6 09:28:24 UTC 2012


On 2012-06-05 12:01, Dan Carpenter wrote:
> On Tue, Jun 05, 2012 at 12:06:10PM +0200, walter harms wrote:
>> Hi all,
>> the patch is fine with me but i have a few basic questions:
>>
>> Why the (void  *) at all ? it returns a name what is a const char *.
>>
>
> We're really returning a pointer to a private struct, it's just that
> the first element on the struct always has to be a pointer to char *.

To be pedantic, it's really returning a pointer to some member of type 
'const char *' within a private struct.  To make life easier for 
themselves, those drivers make that the first member of the private 
struct so a void pointer to the member is also a void pointer to the struct.

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti at mev.co.uk>        )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587         )=-



More information about the devel mailing list