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)
committerJani Nikula <jani.nikula@intel.com>
Wed, 12 Feb 2020 11:24:45 +0000 (13:24 +0200)
commit2933803bdcd8ac67c0b97a0bb158e0762d5ae236
tree00ed87781a2d624f9e083b34dcaf50274e3a49c4
parent52144db1309897f279b53e8df8a0d17e1cda7960
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
(cherry picked from commit 280d14a69da2e71f43408537c008f2775d5e5360)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
drivers/gpu/drm/i915/gem/i915_gem_mman.c
drivers/gpu/drm/i915/gem/i915_gem_object.h