On Wed, 12 Sep 2018 17:13:02 +0200, Arnd Bergmann wrote:
The SNDCTL_* and SOUND_* commands are the old OSS user interface.
I checked all the sound ioctl commands listed in fs/compat_ioctl.c to see if we still need the translation handlers. Here is what I found:
- sound/oss/ is (almost) gone from the kernel, this is what actually needed all the translations
- The ALSA emulation for OSS correctly handles all compat_ioctl commands already.
- sound/oss/dmasound/ is the last holdout of the original OSS code, this is only used on arch/m68k, which has no 64-bit mode and hence needs no compat handlers
- arch/um/drivers/hostaudio_kern.c may run in 64-bit mode with 32-bit x86 user space underneath it. This rare corner case is the only one that still needs the compat handlers.
By adding a simple redirect of .compat_ioctl to .unlocked_ioctl in the UML driver, we can remove all the COMPATIBLE_IOCTL() annotations without a change in functionality. For completeness, I'm adding the same thing to the dmasound file, knowing that it makes no difference.
The compat_ioctl list contains one comment about SNDCTL_DSP_MAPINBUF and SNDCTL_DSP_MAPOUTBUF, which actually would need a translation handler if implemented. However, the native implementation just returns -EINVAL, so we don't care.
Signed-off-by: Arnd Bergmann arnd@arndb.de
Looks good to me.
Reviewed-by: Takashi Iwai tiwai@suse.de
thanks,
Takashi