From: Prike.Liang Date: Mon, 8 Jun 2020 07:20:56 +0000 (+0800) Subject: drm/amdgpu/soc15: fix nullptr issue in soc15_read_register() for reg base accessing X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=207f0f13574825a700a4ea52d3ac4821cea627c8;p=linux.git drm/amdgpu/soc15: fix nullptr issue in soc15_read_register() for reg base accessing 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 Reviewed-by: Alex Deucher Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdgpu/soc15.c b/drivers/gpu/drm/amd/amdgpu/soc15.c index 623745b2d8b3c..3e406eeeaff66 100644 --- a/drivers/gpu/drm/amd/amdgpu/soc15.c +++ b/drivers/gpu/drm/amd/amdgpu/soc15.c @@ -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;