On Thursday 30 June 2011, Ralf Baechle wrote: > #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. Right. It's probably the best we can do. I think we added a few similar definitions when we originally introduce _IOC_TYPECHECK. The idea was never to break existing code, but rather to avoid merging new drivers that use inconsistent ioctl command numbers. Arnd
