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To access the bo from vm mapping first lock the root bo and then the object bo of the mapping to make sure both locks are taken safely. Signed-off-by: Sunil Khatri <sunil.khatri@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit 3aab50410653fe7eb35eb6f9c2b27e3549ab09e6)