drm/amdgpu: Move old fence waiting before reservation lock is aquired v2
Helps avoiding deadlock during GPU reset. Added mutex to amdgpu_ctx to preserve order of fences on a ring. v2: Put waiting logic in a function in a seperate function in amdgpu_ctx.c Signed-off-by: NAndrey Grodzovsky <andrey.grodzovsky@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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