On Mon, Apr 3, 2017 at 2:53 PM, Dan Carpenter <dan.carpenter at oracle.com> wrote:
> 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?
Currently vega10 is the only soc15 gpu so there is else case yet.
Alex
>
> 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
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