Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH 2/3] drm/scheduler: Don't call wait_event_killable for
 signaled process.
To:     =?UTF-8?Q?Michel_D=c3=a4nzer?= <michel@daenzer.net>,
        linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org,
        dri-devel@lists.freedesktop.org
Cc:     David.Panariti@amd.com, oleg@redhat.com, ebiederm@xmission.com,
        Alexander.Deucher@amd.com, akpm@linux-foundation.org,
        Christian.Koenig@amd.com
References: <1524583836-12130-1-git-send-email-andrey.grodzovsky@amd.com>
 <1524583836-12130-3-git-send-email-andrey.grodzovsky@amd.com>
 <7313704c-0693-0bb9-8818-99cd2b7c0ca0@daenzer.net>
From:   Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Message-ID: <6a4ba810-e00a-6446-f3c8-a3be56f24589@amd.com>
Date:   Tue, 24 Apr 2018 11:51:46 -0400
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.4.0
MIME-Version: 1.0
In-Reply-To: <7313704c-0693-0bb9-8818-99cd2b7c0ca0@daenzer.net>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
Content-Language: en-US
Received-SPF: None (protection.outlook.com: amd.com does not designate
 permitted sender hosts)
SpamDiagnosticOutput: 1:99
SpamDiagnosticMetadata: NSPM
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Apr 2018 15:51:50.2701 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: e3de17dd-b13f-4a46-f798-08d5a9fb4b4c
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR1201MB0124
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org


On 04/24/2018 11:46 AM, Michel Dänzer wrote:
> Adding the dri-devel list, since this is driver independent code.

Thanks, so many addresses that this one slipped out...
>
>
> On 2018-04-24 05:30 PM, Andrey Grodzovsky wrote:
>> Avoid calling wait_event_killable when you are possibly being called
>> from get_signal routine since in that case you end up in a deadlock
>> where you are alreay blocked in singla processing any trying to wait
> Multiple typos here, "[...] already blocked in signal processing and [...]"?

I don't understand where are the typos.

Andrey

>
>
>> on a new signal.
>>
>> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
>> ---
>>   drivers/gpu/drm/scheduler/gpu_scheduler.c | 5 +++--
>>   1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler.c b/drivers/gpu/drm/scheduler/gpu_scheduler.c
>> index 088ff2b..09fd258 100644
>> --- a/drivers/gpu/drm/scheduler/gpu_scheduler.c
>> +++ b/drivers/gpu/drm/scheduler/gpu_scheduler.c
>> @@ -227,9 +227,10 @@ void drm_sched_entity_do_release(struct drm_gpu_scheduler *sched,
>>   		return;
>>   	/**
>>   	 * The client will not queue more IBs during this fini, consume existing
>> -	 * queued IBs or discard them on SIGKILL
>> +	 * queued IBs or discard them when in death signal state since
>> +	 * wait_event_killable can't receive signals in that state.
>>   	*/
>> -	if ((current->flags & PF_SIGNALED) && current->exit_code == SIGKILL)
>> +	if (current->flags & PF_SIGNALED)
>>   		entity->fini_status = -ERESTARTSYS;
>>   	else
>>   		entity->fini_status = wait_event_killable(sched->job_scheduled,
>>
>