Messages in this thread | | | Date | Wed, 12 Dec 2012 02:42:22 +0100 | From | "Hans J. Koch" <> | Subject | Re: [PATCH 2/2] uio: do not expose inode to uio open/release hooks |
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On Tue, Dec 11, 2012 at 03:20:32PM -0800, Greg KH wrote: > On Wed, Dec 12, 2012 at 12:12:02AM +0100, Benedikt Spranger wrote: > > The inode parameter is unused by in kernel users of UIO. > > Ok. > > > Also the inode parameter makes it hard to resolve the existing open(), > > mmap() and close() difficulty. > > I don't understand, what do you mean by this? What is this parameter > causing problems with?
The problem is that according to POSIX, it is guaranteed that in userspace you can do
fd = open("/dev/uio0", ...) ptr = mmap(...fd...) close(fd)
with ptr still being valid and useable after that.
Thanks, Hans
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