This commit removes a duplicate check for *is_queue_unmap in the
sdma_v7_0_ring_set_wptr function. The check at line 171 was considered
dead code because at this point in the code, we already know that
*is_queue_unmap is false due to the check at line 161.
By removing this unnecessary check, improves the readability of the code
Fixes the below:
drivers/gpu/drm/amd/amdgpu/sdma_v7_0.c:171 sdma_v7_0_ring_set_wptr()
warn: duplicate check '*is_queue_unmap' (previous on line 161)
drivers/gpu/drm/amd/amdgpu/sdma_v7_0.c
140 static void sdma_v7_0_ring_set_wptr(struct amdgpu_ring *ring)
141 {
142 struct amdgpu_device *adev = ring->adev;
143 uint32_t *wptr_saved;
144 uint32_t *is_queue_unmap;
145 uint64_t aggregated_db_index;
146 uint32_t mqd_size = adev->mqds[AMDGPU_HW_IP_DMA].mqd_size;
147
148 DRM_DEBUG("Setting write pointer\n");
149
150 if (ring->is_mes_queue) {
151 wptr_saved = (uint32_t *)(ring->mqd_ptr + mqd_size);
152 is_queue_unmap = (uint32_t *)(ring->mqd_ptr + mqd_size +
^^^^^^^^^^^^^^^^ Set here
153 sizeof(uint32_t));
154 aggregated_db_index =
155 amdgpu_mes_get_aggregated_doorbell_index(adev,
156 ring->hw_prio);
157
158 atomic64_set((atomic64_t *)ring->wptr_cpu_addr,
159 ring->wptr << 2);
160 *wptr_saved = ring->wptr << 2;
161 if (*is_queue_unmap) {
^^^^^^^^^^^^^^^ Checked here
162 WDOORBELL64(aggregated_db_index, ring->wptr << 2);
163 DRM_DEBUG("calling WDOORBELL64(0x%08x, 0x%016llx)\n",
164 ring->doorbell_index, ring->wptr << 2);
165 WDOORBELL64(ring->doorbell_index, ring->wptr << 2);
166 } else {
167 DRM_DEBUG("calling WDOORBELL64(0x%08x, 0x%016llx)\n",
168 ring->doorbell_index, ring->wptr << 2);
169 WDOORBELL64(ring->doorbell_index, ring->wptr << 2);
170
--> 171 if (*is_queue_unmap)
^^^^^^^^^^^^^^^ This is dead code. We know it's false.
172 WDOORBELL64(aggregated_db_index,
173 ring->wptr << 2);
174 }
175 } else {
176 if (ring->use_doorbell) {
177 DRM_DEBUG("Using doorbell -- "
178 "wptr_offs == 0x%08x "
Fixes: 6d9c711786e6 ("drm/amdgpu: Add sdma v7_0 ip block support (v7)")
Cc: Likun Gao <Likun.Gao@xxxxxxx>
Cc: Hawking Zhang <Hawking.Zhang@xxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/sdma_v7_0.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v7_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v7_0.c
index 4a5252e08883..ab1dea77be6e 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v7_0.c
@@ -167,10 +167,6 @@ static void sdma_v7_0_ring_set_wptr(struct amdgpu_ring *ring)
DRM_DEBUG("calling WDOORBELL64(0x%08x, 0x%016llx)\n",
ring->doorbell_index, ring->wptr << 2);
WDOORBELL64(ring->doorbell_index, ring->wptr << 2);
-
- if (*is_queue_unmap)
- WDOORBELL64(aggregated_db_index,
- ring->wptr << 2);
}
} else {
if (ring->use_doorbell) {
--
2.34.1
