tree 801a090e9ad5b69fb6a12e9e5268fa836b80fa43
parent 5040573e49cc8f0e016a83544a0e552f2f44c897
author Jonathan Gonzalez V <zeus@gnu.org> 1401923250 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1401926040 -0700

drm/exynos: call find_vma with the mmap_sem held

Performing vma lookups without taking the mm->mmap_sem is asking for
trouble.  While doing the search, the vma in question can be modified or
even removed before returning to the caller.  Take the lock (exclusively)
in order to avoid races while iterating through the vmacache and/or
rbtree.

Signed-off-by: Jonathan Gonzalez V <zeus@gnu.org>
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Joonyoung Shim <jy0922.shim@samsung.com>
Cc: David Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>