drm/i915/gem: Tighten checks and acquiring the mmap object
authorChris Wilson <chris@chris-wilson.co.uk>
Thu, 30 Jan 2020 14:39:31 +0000 (14:39 +0000)
committerChris Wilson <chris@chris-wilson.co.uk>
Thu, 30 Jan 2020 20:27:41 +0000 (20:27 +0000)
commit280d14a69da2e71f43408537c008f2775d5e5360
treec3ad42db34534c1dec5cef4365a915204266fe07
parent37b7617262bd012359a33deb887947ad7cc989f9
drm/i915/gem: Tighten checks and acquiring the mmap object

Make sure we hold the rcu lock as we acquire the rcu protected reference
of the object when looking it up from the associated mmap vma.

Closes: https://gitlab.freedesktop.org/drm/intel/issues/1083
Fixes: cc662126b413 ("drm/i915: Introduce DRM_I915_GEM_MMAP_OFFSET")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200130143931.1906301-1-chris@chris-wilson.co.uk
drivers/gpu/drm/i915/gem/i915_gem_mman.c
drivers/gpu/drm/i915/gem/i915_gem_object.h