From 8b4253b0c06f92c6d77a6d1c7653c0f1bdf4425a Mon Sep 17 00:00:00 2001 From: Michal Hocko Date: Mon, 23 May 2016 16:26:17 -0700 Subject: [PATCH] drm/amdgpu: make amdgpu_mn_get wait for mmap_sem killable MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit amdgpu_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. [arnd@arndb.de: use ERR_PTR() to return from amdgpu_mn_get] Signed-off-by: Michal Hocko Acked-by: Vlastimil Babka Reviewed-by: Christian König Cc: David Airlie Cc: Alex Deucher Signed-off-by: Arnd Bergmann Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c index 9f4a45cd2aab8..32fa7b7913f78 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c @@ -232,7 +232,10 @@ static struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev) int r; mutex_lock(&adev->mn_lock); - down_write(&mm->mmap_sem); + if (down_write_killable(&mm->mmap_sem)) { + mutex_unlock(&adev->mn_lock); + return ERR_PTR(-EINTR); + } hash_for_each_possible(adev->mn_hash, rmn, node, (unsigned long)mm) if (rmn->mm == mm) -- 2.39.5