Commit 2267c299 authored by Michal Hocko's avatar Michal Hocko Committed by Linus Torvalds

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: default avatarMichal Hocko <mhocko@suse.com>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: David Airlie <airlied@linux.ie>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 80a89a5e
......@@ -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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