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pipe: return -ENOIOCTLCMD instead of -EINVAL on unknown ioctl command 

As described in commit 07d106d0a3 ("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>
This commit is contained in:
Will Deacon 2012-05-31 16:26:10 -07:00 committed by Linus Torvalds
parent c67e5382fb
commit a1d494495c
1 changed files with 1 additions and 1 deletions
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2
fs/pipe.c
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@ -693,7 +693,7 @@ static long pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return put_user(count, (int __user *)arg);
default:
return -EINVAL;
return -ENOIOCTLCMD;
}
}