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drm/amdgpu/soc15: fix nullptr issue in soc15_read_register() for reg base accessing

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The failed case is no SDMA1 IP for Renoir discovery table while in accessing SDMA1 reg base,
thus need have nullptr test for soc15_read_register invoked in MMR addres space inquire opt.

Signed-off-by: Prike.Liang <Prike.Liang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Prike.Liang 2020-06-08 15:20:56 +08:00 committed by Alex Deucher
parent d00c3d045c
commit 207f0f1357
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/amdgpu/soc15.c
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@ -415,7 +415,8 @@ static int soc15_read_register(struct amdgpu_device *adev, u32 se_num,
*value = 0;
for (i = 0; i < ARRAY_SIZE(soc15_allowed_read_registers); i++) {
en = &soc15_allowed_read_registers[i];
if (reg_offset != (adev->reg_offset[en->hwip][en->inst][en->seg]
if (adev->reg_offset[en->hwip][en->inst] &&
reg_offset != (adev->reg_offset[en->hwip][en->inst][en->seg]
+ en->reg_offset))
continue;