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drm/amdgpu: Fix cat debugfs amdgpu_regs_didt causes kernel null pointer
[ 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>
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1 changed files with 6 additions and 0 deletions
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@ -342,6 +342,9 @@ static ssize_t amdgpu_debugfs_regs_didt_read(struct file *f, char __user *buf,
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if (size & 0x3 || *pos & 0x3)
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return -EINVAL;
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if (!adev->didt_rreg)
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return -EOPNOTSUPP;
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r = pm_runtime_get_sync(adev_to_drm(adev)->dev);
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if (r < 0) {
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pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
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@ -401,6 +404,9 @@ static ssize_t amdgpu_debugfs_regs_didt_write(struct file *f, const char __user
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if (size & 0x3 || *pos & 0x3)
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return -EINVAL;
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if (!adev->didt_wreg)
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return -EOPNOTSUPP;
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r = pm_runtime_get_sync(adev_to_drm(adev)->dev);
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if (r < 0) {
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pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
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