[alsa-devel] SB16 build error.

[Ralf Baechle]

On Thu, Jun 30, 2011 at 02:38:20PM +0200, Takashi Iwai wrote:

> > In userland an empty definition will be used for _IOC_TYPECHECK so there
> > won't be an error.  So userland already is already using the existing
> > value for SNDRV_SB_CSP_IOCTL_LOAD_CODE ...
> 
> Right.  It has an invalid direction (3), but apps won't care such
> details anyway.
> 
> > With a crude hack like
> > 
> > #define SNDRV_SB_CSP_IOCTL_LOAD_CODE				\
> > 	_IOC(_IOC_WRITE,'H', 0x11, sizeof(struct snd_sb_csp_microcode))
> > 
> > error checking can be bypassed and all will be fine as long as the
> > resulting value doesn't result in in a a duplicate case value - which it
> > doesn't, at least not in my testing.
> > 
> > Should work but isn't nice.
> 
> Indeed.  But which is uglier is hard to answer :)
> 
> If you are fine with the hacked ioctl number above, I can put it
> with some comments.  This won't break anything, at least.

Go ahead then and yes, this really deserves a comment.

  Ralf