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PRT BOs may not have any backing store, so bo->tbo.resource will be NULL. Check for that before dereferencing. Fixes:0cce5f285d("drm/amdkfd: Check correct memory types for is_system variable") Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Natalie Vock <natalie.vock@gmx.de> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit3e3fcd29b5) Cc: stable@vger.kernel.org # 6.12.x