linux-kernel - Re: [PATCH] drm/amdkfd/kfd_mqd_manager_v10: Fix missing break in switch statement

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Date:   Mon, 22 Jul 2019 17:43:56 +0000
From:   "Liu, Shaoyun" <Shaoyun.Liu@....com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Cox, Philip" <Philip.Cox@....com>,
        Oded Gabbay <oded.gabbay@...il.com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Zhou, David(ChunMing)" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
CC:     "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amdkfd/kfd_mqd_manager_v10: Fix missing break in
 switch statement

That sounds good to me .

Regards

shaoyun.liu

On 2019-07-22 12:13 p.m., Gustavo A. R. Silva wrote:
>
> On 7/22/19 10:58 AM, Deucher, Alexander wrote:
>> We need to add a /*fall through */ comment then.
>>
> It might be better to remove the call to pr_debug() in KFD_MQD_TYPE_CP:
>
> 	case KFD_MQD_TYPE_CP:
>         	case KFD_MQD_TYPE_COMPUTE:
> 		pr_debug("%s@%i\n", __func__, __LINE__);
> 		mqd->allocate_mqd = allocate_mqd;
>
> Thanks
> --
> Gustavo
>
>
>> Alex
>> ________________________________
>> From: Liu, Shaoyun <Shaoyun.Liu@....com>
>> Sent: Monday, July 22, 2019 11:14 AM
>> To: Gustavo A. R. Silva <gustavo@...eddedor.com>; Cox, Philip <Philip.Cox@....com>; Oded Gabbay <oded.gabbay@...il.com>; Deucher, Alexander <Alexander.Deucher@....com>; Koenig, Christian <Christian.Koenig@....com>; Zhou, David(ChunMing) <David1.Zhou@....com>; David Airlie <airlied@...ux.ie>; Daniel Vetter <daniel@...ll.ch>
>> Cc: amd-gfx@...ts.freedesktop.org <amd-gfx@...ts.freedesktop.org>; dri-devel@...ts.freedesktop.org <dri-devel@...ts.freedesktop.org>; linux-kernel@...r.kernel.org <linux-kernel@...r.kernel.org>
>> Subject: Re: [PATCH] drm/amdkfd/kfd_mqd_manager_v10: Fix missing break in switch statement
>>
>> This one properly in purpose , The mqd init for CP and  COMPUTE will
>> have the same  routine .
>>
>> Regard
>>
>> sshaoyun.liu
>>
>> On 2019-07-21 6:59 p.m., Gustavo A. R. Silva wrote:
>>> Add missing break statement in order to prevent the code from falling
>>> through to case KFD_MQD_TYPE_COMPUTE.
>>>
>>> This bug was found thanks to the ongoing efforts to enable
>>> -Wimplicit-fallthrough.
>>>
>>> Fixes: 14328aa58ce5 ("drm/amdkfd: Add navi10 support to amdkfd. (v3)")
>>> Cc: stable@...r.kernel.org
>>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>>> ---
>>>    drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v10.c | 1 +
>>>    1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v10.c b/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v10.c
>>> index 4f8a6ffc5775..1d8b13ad46f9 100644
>>> --- a/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v10.c
>>> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v10.c
>>> @@ -430,6 +430,7 @@ struct mqd_manager *mqd_manager_init_v10(enum KFD_MQD_TYPE type,
>>>         switch (type) {
>>>         case KFD_MQD_TYPE_CP:
>>>                 pr_debug("%s@%i\n", __func__, __LINE__);
>>> +             break;
>>>         case KFD_MQD_TYPE_COMPUTE:
>>>                 pr_debug("%s@%i\n", __func__, __LINE__);
>>>                 mqd->allocate_mqd = allocate_mqd;