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Date: Tue, 21 Apr 2020 16:53:47 +0200
From: Christian König <christian.koenig@....com>
To: 赵军奎 <bernard@...o.com>
Cc: Alex Deucher <alexander.deucher@....com>,
"David (ChunMing) Zhou" <David1.Zhou@....com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Tom St Denis <tom.stdenis@....com>,
Ori Messinger <Ori.Messinger@....com>,
Sam Ravnborg <sam@...nborg.org>, amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
opensource.kernel@...o.com
Subject: Re: [PATCH] amdgpu: fixes memleak issue when init failed
Am 21.04.20 um 15:39 schrieb 赵军奎:
> 发件人："Christian König" <christian.koenig@....com>
> 发送日期：2020-04-21 21:02:27
> 收件人："赵军奎" <bernard@...o.com>
> 抄送人：Alex Deucher <alexander.deucher@....com>,"David (ChunMing) Zhou" <David1.Zhou@....com>,David Airlie <airlied@...ux.ie>,Daniel Vetter <daniel@...ll.ch>,Tom St Denis <tom.stdenis@....com>,Ori Messinger <Ori.Messinger@....com>,Sam Ravnborg <sam@...nborg.org>,amd-gfx@...ts.freedesktop.org,dri-devel@...ts.freedesktop.org,linux-kernel@...r.kernel.org,opensource.kernel@...o.com
> 主题：Re: [PATCH] amdgpu: fixes memleak issue when init failed>Am 21.04.20 um 14:09 schrieb 赵军奎:
>>> From: "Christian König" <christian.koenig@....com>
>>> Date: 2020-04-21 19:22:49
>>> To: Bernard Zhao <bernard@...o.com>,Alex Deucher <alexander.deucher@....com>,"David (ChunMing) Zhou" <David1.Zhou@....com>,David Airlie <airlied@...ux.ie>,Daniel Vetter <daniel@...ll.ch>,Tom St Denis <tom.stdenis@....com>,Ori Messinger <Ori.Messinger@....com>,Sam Ravnborg <sam@...nborg.org>,amd-gfx@...ts.freedesktop.org,dri-devel@...ts.freedesktop.org,linux-kernel@...r.kernel.org
>>> Cc: opensource.kernel@...o.com
>>> Subject: Re: [PATCH] amdgpu: fixes memleak issue when init failed>Am 21.04.20 um 13:17 schrieb Bernard Zhao:
>>>>> VRAM manager and DRM MM when init failed, there is no operaction
>>>>> to free kzalloc memory & remove device file.
>>>>> This will lead to memleak & cause stability issue.
>>>> NAK, failure to create sysfs nodes are not critical.
>>>>
>>>> Christian.
>>>>
>>> OK, get it.
>>> By the way, should i modify this patch to just handle <kfree(mgr)> in error branch, or that it is also unnecessary?
>> What you can do is to drop the "return ret" if anything with the sysfs
>> nodes goes wrong and instead print the error code.
> Emmm, for this part, i am not sure, my modify first print the error, secone release not free memory,
> and last return error, make everything clear to the system.
> I think it`s the same with what you mentioned, is there something that I misunderstood?
Yes, maybe an example makes it more clear what to do here. Currently we
print and error and return when something with the sysfs files goes wrong:
if (ret) {
DRM_ERROR("Failed to create device file mem_info_vram_total\n");
return ret;
}
But what we should do instead is just to print an error and continue and
in the end return success status:
if (ret)
DRM_ERROR("Failed to create device file mem_info_vram_total
(%d)\n", r);
...
return 0;
Regards,
Christian.
>
>> It's really annoying that loading, unloading and loading the driver
>> again sometimes fails because we have a bug in the sysfs files cleanup.
>>
>> We certainly should fix those bugs as well, but they are just not
>> critical for correct driver functionality.
>>
>> Regards,
>> Christian.
>
>>> Regards,
>>> Bernard
>>>
>>>>> Signed-off-by: Bernard Zhao <bernard@...o.com>
>>>>> ---
>>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 24 ++++++++++++++++----
>>>>> 1 file changed, 19 insertions(+), 5 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
>>>>> index 82a3299e53c0..4c5fb153e6b4 100644
>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
>>>>> @@ -175,30 +175,44 @@ static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
>>>>> ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_total);
>>>>> if (ret) {
>>>>> DRM_ERROR("Failed to create device file mem_info_vram_total\n");
>>>>> - return ret;
>>>>> + goto VRAM_TOTAL_FAIL;
>>>>> }
>>>>> ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_total);
>>>>> if (ret) {
>>>>> DRM_ERROR("Failed to create device file mem_info_vis_vram_total\n");
>>>>> - return ret;
>>>>> + goto VIS_VRAM_TOTA_FAIL;
>>>>> }
>>>>> ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_used);
>>>>> if (ret) {
>>>>> DRM_ERROR("Failed to create device file mem_info_vram_used\n");
>>>>> - return ret;
>>>>> + goto VRAM_USED_FAIL;
>>>>> }
>>>>> ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_used);
>>>>> if (ret) {
>>>>> DRM_ERROR("Failed to create device file mem_info_vis_vram_used\n");
>>>>> - return ret;
>>>>> + goto VIS_VRAM_USED_FAIL;
>>>>> }
>>>>> ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_vendor);
>>>>> if (ret) {
>>>>> DRM_ERROR("Failed to create device file mem_info_vram_vendor\n");
>>>>> - return ret;
>>>>> + goto VRAM_VERDOR_FAIL;
>>>>> }
>>>>>
>>>>> return 0;
>>>>> +
>>>>> +VRAM_VERDOR_FAIL:
>>>>> + device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_used);
>>>>> +VIS_VRAM_USED_FAIL:
>>>>> + device_remove_file(adev->dev, &dev_attr_mem_info_vram_used);
>>>>> +RVAM_USED_FAIL:
>>>>> + device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_total);
>>>>> +VIS_VRAM_TOTA_FAIL:
>>>>> + device_remove_file(adev->dev, &dev_attr_mem_info_vram_total);
>>>>> +VRAM_TOTAL_FAIL:
>>>>> + kfree(mgr);
>>>>> + man->priv = NULL;
>>>>> +
>>>>> + return ret;
>>>>> }
>>>>>
>>>>> /**
>
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