drm/amdgpu: Fix cat debugfs amdgpu_regs_didt causes kernel null pointer

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[ Upstream commit 2161e09cd0 ]

For 'AMDGPU_FAMILY_SI' family cards, in 'si_common_early_init' func, init
'didt_rreg' and 'didt_wreg' to 'NULL'. But in func
'amdgpu_debugfs_regs_didt_read/write', using 'RREG32_DIDT' 'WREG32_DIDT'
lacks of relevant judgment. And other 'amdgpu_ip_block_version' that use
these two definitions won't be added for 'AMDGPU_FAMILY_SI'.

So, add null pointer judgment before calling.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Lu Yao <yaolu@kylinos.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Lu Yao 2023-11-23 09:22:34 +08:00 • committed by Greg Kroah-Hartman

parent d551c77727

commit 53a37135f7

1 changed files with 6 additions and 0 deletions

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drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c

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