drm/radeon: fix HDP flushing
This was regressed by commit 39e7f6f8, although I don't know of any actual issues caused by it. The storage domain is read without TTM locking now, but the lock never helped to prevent any races. Reviewed-by: Christian König <christian.koenig@amd.com> Cc: stable@vger.kernel.org Signed-off-by: Grigori Goronzy <greg@chown.ath.cx> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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