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pipe: return -ENOIOCTLCMD instead of -EINVAL on unknown ioctl command
As described in commit 07d106d ("vfs: fix up ENOIOCTLCMD error handling"), drivers should return -ENOIOCTLCMD if they receive an ioctl command which they don't understand. Doing so will result in -ENOTTY being returned to userspace, which matches the behaviour of the compat layer if it fails to translate an ioctl command. This patch fixes the pipe ioctl to return -ENOIOCTLCMD instead of -EINVAL when passed an unknown ioctl command. Signed-off-by: Will Deacon <will.deacon@arm.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Acked-by: Alan Cox <alan@linux.intel.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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