[Dropping CCing the individual people, but adding the dri-devel mailing
list as well instead].
Am 29.02.2016 um 14:26 schrieb Michal Hocko:
From: Michal Hocko <mhocko@xxxxxxxx>
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.
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: "Christian König" <christian.koenig@xxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
This one and patch #18 in this series are Reviewed-by: Christian König
<christian.koenig@xxxxxxx>.
Nice to see some improvements on this side,
Christian.
---
drivers/gpu/drm/radeon/radeon_mn.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
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)
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