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author	Yintian Tao <yttao@amd.com>
	Thu, 23 Apr 2020 04:05:54 +0000 (12:05 +0800)
committer	Alex Deucher <alexander.deucher@amd.com>
	Fri, 24 Apr 2020 15:42:11 +0000 (11:42 -0400)
commit	04e4e2e9558326316cf3e32d46cca83cc3861ef0
tree	d490fb722bfb5b8a59dc288505fd6544e46d45ef	tree \| snapshot
parent	312a79b6eafe5c45e3e232506a4a6e97d7cdbba4	commit \| diff

drm/amdgpu: protect ring overrun

Wait for the oldest sequence on the ring
to be signaled in order to make sure there
will be no command overrun.

v2: fix coding stype and remove abs operation
v3: remove the initialization of variable r

Signed-off-by: Yintian Tao <yttao@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Domain: System / Kernel;

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drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c		diff \| blob \| history
drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c		diff \| blob \| history
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h		diff \| blob \| history
drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c		diff \| blob \| history
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c		diff \| blob \| history
drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c		diff \| blob \| history
drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c		diff \| blob \| history