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> --- 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) -- 2.7.0 -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
