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drm/amdgpu: Add comment to describe the purpose of one difficult if statement

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Use == instead of != in the if statement to make code easier understood

Signed-off-by: Alex Xie <AlexBin.Xie@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Xie 2016-06-06 18:14:57 -04:00 committed by Alex Deucher
parent 677131a16d
commit 3a6f8e0c72
1 changed files with 7 additions and 4 deletions
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11
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
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@ -780,8 +780,13 @@ static void amdgpu_vm_update_ptes(struct amdgpu_device *adev,
next_pe_start = amdgpu_bo_gpu_offset(pt);
next_pe_start += (addr & mask) * 8;
if (cur_pe_end != next_pe_start) {
if (cur_pe_end == next_pe_start) {
/* The next ptb is consecutive to current ptb.
* Don't call amdgpu_vm_frag_ptes now.
* Will update two ptbs together in future.
*/
cur_pe_end += 8 * nptes;
} else {
amdgpu_vm_frag_ptes(adev, vm_update_params,
cur_pe_start, cur_pe_end,
cur_dst, flags);
@ -789,8 +794,6 @@ static void amdgpu_vm_update_ptes(struct amdgpu_device *adev,
cur_pe_start = next_pe_start;
cur_pe_end = next_pe_start + 8 * nptes;
cur_dst = dst;
} else {
cur_pe_end += 8 * nptes;
}
addr += nptes;