[PATCH 11/18] drm/armada: Don't grab dev->struct_mutex for in mmap offset ioctl

[Russell King - ARM Linux]

On Thu, Jul 09, 2015 at 11:32:43PM +0200, Daniel Vetter wrote:
> Since David Herrmann's mmap vma manager rework we don't need to grab
> dev->struct_mutex any more to prevent races when looking up the mmap
> offset. Drop it and instead don't forget to use the unref_unlocked
> variant (since the drm core still cares).
> 
> While at it also fix a leak when this ioctl is called on an imported
> buffer.

Good catch, thanks Daniel.  I'd prefer these to be two different commits
though, so that the leak can be easily backported to stable kernels if
needed.

I suspect this should go through the same tree that David's work is,
otherwise we end up with random dependencies between trees.  With the
bug fix separated out:

Acked-by: Russell King <rmk+kernel at arm.linux.org.uk>

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