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authorMichal Hocko <mhocko@suse.com>2016-05-23 16:26:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-23 17:04:14 -0700
commit2267c2999b49682ae4801dab3b1ac96584f57da0 (patch)
tree808c7773c0b1d447311b1a0c59cd650649f80102
parent80a89a5e8513c6a1158fb07946cfe63c8430ba7a (diff)
downloadlinux-2267c2999b49682ae4801dab3b1ac96584f57da0.tar.gz
drm/radeon: make radeon_mn_get wait for mmap_sem killable
radeon_mn_get which is called during ioct path 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 <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Christian K├Ânig <christian.koenig@amd.com> Cc: Alex Deucher <alexander.deucher@amd.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>
-rw-r--r--drivers/gpu/drm/radeon/radeon_mn.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c
index eef006c48584..896f2cf51e4e 100644
--- a/drivers/gpu/drm/radeon/radeon_mn.c
+++ b/drivers/gpu/drm/radeon/radeon_mn.c
@@ -186,7 +186,9 @@ static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev)
struct radeon_mn *rmn;
int r;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return ERR_PTR(-EINTR);
+
mutex_lock(&rdev->mn_lock);
hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm)