[PATCH 1/1] drm/amdgpu: return early if debugfs is not initialized

[Christian König]

Am 06.10.21 um 13:55 schrieb Lazar, Lijo:
>
>
> On 10/6/2021 3:21 PM, Nirmoy Das wrote:
>> Check first if debugfs is initialized before creating
>> amdgpu debugfs files.
>>
>> References: https://gitlab.freedesktop.org/drm/amd/-/issues/1686
>> Signed-off-by: Nirmoy Das <nirmoy.das at amd.com>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>
> Sorry about another miss. There is one other option added in the patch.
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a24c6f7bc923d5e2f3139855eb09b0d480d6b410 
>
>
> "
> config DEBUG_FS_DISALLOW_MOUNT
>     bool "Do not register debugfs as filesystem"
>     help
>       The API is open but filesystem is not loaded. Clients can still 
> do their work and read with debug tools that do not need debugfs 
> filesystem.
> "

I'm really wondering why it's useful to have debugfs enabled, but not 
mounted.

>
> This doesn't work under this mode. Guess, we are not worried about this.
>
> Reviewed-by: Lijo Lazar <lijo.lazar at amd.com>

Anyway Reviewed-by: Christian König <christian.koenig at amd.com>

>
> Thanks,
> Lijo
>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c 
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>> index 6611b3c7c149..5497e2d31d1a 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>> @@ -1617,6 +1617,9 @@ int amdgpu_debugfs_init(struct amdgpu_device 
>> *adev)
>>       struct dentry *ent;
>>       int r, i;
>>   +    if (!debugfs_initialized())
>> +        return 0;
>> +
>>       ent = debugfs_create_file("amdgpu_preempt_ib", 0600, root, adev,
>>                     &fops_ib_preempt);
>>       if (IS_ERR(ent)) {
>>