Hello Ken Wang,
The patch 220ab9bd1ccf: "drm/amdgpu: soc15 enable (v3)" from Mar 6,
2017, leads to the following static checker warning:
drivers/gpu/drm/amd/amdgpu/soc15.c:110 soc15_pcie_rreg()
error: potentially dereferencing uninitialized 'nbio_pcie_id'.
drivers/gpu/drm/amd/amdgpu/soc15.c
101 static u32 soc15_pcie_rreg(struct amdgpu_device *adev, u32 reg)
102 {
103 unsigned long flags, address, data;
104 u32 r;
105 struct nbio_pcie_index_data *nbio_pcie_id;
106
107 if (adev->asic_type == CHIP_VEGA10)
108 nbio_pcie_id = &nbio_v6_1_pcie_index_data;
There should be an else statement to this probably?
109
110 address = nbio_pcie_id->index_offset;
111 data = nbio_pcie_id->data_offset;
112
113 spin_lock_irqsave(&adev->pcie_idx_lock, flags);
114 WREG32(address, reg);
115 (void)RREG32(address);
116 r = RREG32(data);
117 spin_unlock_irqrestore(&adev->pcie_idx_lock, flags);
118 return r;
119 }
120
See also:
drivers/gpu/drm/amd/amdgpu/soc15.c:110 soc15_pcie_rreg() error: potentially dereferencing uninitialized 'nbio_pcie_id'.
drivers/gpu/drm/amd/amdgpu/soc15.c:129 soc15_pcie_wreg() error: potentially dereferencing uninitialized 'nbio_pcie_id'.
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1736 amdgpu_sriov_reinit_early() error: uninitialized symbol 'r'.
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c:3033 gfx_v9_0_ring_emit_hdp_flush() error: potentially dereferencing uninitialized 'nbio_hf_reg'.
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c:3036 gfx_v9_0_ring_emit_hdp_flush() error: potentially dereferencing uninitialized 'nbio_hf_reg'.
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c:3043 gfx_v9_0_ring_emit_hdp_flush() error: potentially dereferencing uninitialized 'nbio_hf_reg'.
drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c:357 sdma_v4_0_ring_emit_hdp_flush() error: potentially dereferencing uninitialized 'nbio_hf_reg'.
drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c:359 sdma_v4_0_ring_emit_hdp_flush() error: potentially dereferencing uninitialized 'nbio_hf_reg'.
drivers/gpu/drm/amd/amdgpu/../powerplay/smumgr/vega10_smumgr.c:425 vega10_smu_init() error: uninitialized symbol 'handle'.
drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/vega10_hwmgr.c:2860 vega10_apply_state_adjust_rules() error: uninitialized symbol 'stable_pstate_sclk_dpm_percentage'.
regards,
dan carpenter
