diff options
authorMichal Hocko <>2016-05-23 16:26:11 -0700
committerLinus Torvalds <>2016-05-23 17:04:14 -0700
commit80a89a5e8513c6a1158fb07946cfe63c8430ba7a (patch)
parent598fdc1d66674264e122ca9d007ad822e98d8b8d (diff)
drm/i915: make i915_gem_mmap_ioctl wait for mmap_sem killable
i915_gem_mmap_ioctl relies on mmap_sem for write. If the waiting task gets killed by the oom killer it would block oom_reaper from asynchronous address space reclaim and reduce the chances of timely OOM resolving. Wait for the lock in the killable mode and return with EINTR if the task got killed while waiting. Signed-off-by: Michal Hocko <> Acked-by: Vlastimil Babka <> Cc: Daniel Vetter <> Cc: David Airlie <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 233adc31ef0c..ddd1d78c346f 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1754,7 +1754,10 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem)) {
+ drm_gem_object_unreference_unlocked(obj);
+ return -EINTR;
+ }
vma = find_vma(mm, addr);
if (vma)
vma->vm_page_prot =