发件人："Christian König" <christian.koe...@amd.com>
发送日期：2020-04-21 21:02:27
收件人："赵军奎" <bern...@vivo.com>
抄送人：Alex Deucher <alexander.deuc...@amd.com>,"David (ChunMing) Zhou"
<david1.z...@amd.com>,David Airlie <airl...@linux.ie>,Daniel Vetter
<dan...@ffwll.ch>,Tom St Denis <tom.stde...@amd.com>,Ori Messinger
<ori.messin...@amd.com>,Sam Ravnborg
<s...@ravnborg.org>,amd-gfx@lists.freedesktop.org,dri-de...@lists.freedesktop.org,linux-ker...@vger.kernel.org,opensource.ker...@vivo.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.koe...@amd.com>
>> Date: 2020-04-21 19:22:49
>> To: Bernard Zhao <bern...@vivo.com>,Alex Deucher
>> <alexander.deuc...@amd.com>,"David (ChunMing) Zhou"
>> <david1.z...@amd.com>,David Airlie <airl...@linux.ie>,Daniel Vetter
>> <dan...@ffwll.ch>,Tom St Denis <tom.stde...@amd.com>,Ori Messinger
>> <ori.messin...@amd.com>,Sam Ravnborg
>> <s...@ravnborg.org>,amd-gfx@lists.freedesktop.org,dri-de...@lists.freedesktop.org,linux-ker...@vger.kernel.org
>> Cc: opensource.ker...@vivo.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?
>
>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 <bern...@vivo.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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