From 2022ca0a940a1625904bfff6879dc8732171d089 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Thu, 6 Sep 2018 22:54:38 +0200 Subject: compat_ioctl: remove translation for sound ioctls 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. Reviewed-by: Takashi Iwai Signed-off-by: Arnd Bergmann --- arch/um/drivers/hostaudio_kern.c | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/um') diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c index bf75b1ceac47..d35d3f305a31 100644 --- a/arch/um/drivers/hostaudio_kern.c +++ b/arch/um/drivers/hostaudio_kern.c @@ -298,6 +298,7 @@ static const struct file_operations hostaudio_fops = { .write = hostaudio_write, .poll = hostaudio_poll, .unlocked_ioctl = hostaudio_ioctl, + .compat_ioctl = compat_ptr_ioctl, .mmap = NULL, .open = hostaudio_open, .release = hostaudio_release, -- cgit v1.2.3-59-g8ed1b