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

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As described in commit 07d106d0a ("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.

Cc: Al Viro <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Will Deacon 2012-05-25 11:39:13 +01:00 • committed by Al Viro
commit 46ce341b2f
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;
}
}