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([2a02:908:1252:fb60:8e28:1d3:41f3:e15a]) by smtp.gmail.com with ESMTPSA id g4sm5902727edm.83.2021.05.19.03.57.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 19 May 2021 03:57:12 -0700 (PDT) Subject: Re: [PATCH v7 13/16] drm/scheduler: Fix hang when sched_entity released To: Andrey Grodzovsky , =?UTF-8?Q?Christian_K=c3=b6nig?= , dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, linux-pci@vger.kernel.org, daniel.vetter@ffwll.ch, Harry.Wentland@amd.com Cc: ppaalanen@gmail.com, Alexander.Deucher@amd.com, gregkh@linuxfoundation.org, helgaas@kernel.org, Felix.Kuehling@amd.com References: <20210512142648.666476-1-andrey.grodzovsky@amd.com> <20210512142648.666476-14-andrey.grodzovsky@amd.com> <9e1270bf-ab62-5d76-b1de-e6cd49dc4841@amd.com> <34d4e4a8-c577-dfe6-3190-28a5c63a2d23@amd.com> <8228ea6b-4faf-bb7e-aaf4-8949932e869a@amd.com> <53f281cc-e4c0-ea5d-9415-4413c85a6a16@amd.com> <0b49fc7b-ca0b-58c4-3f76-c4a5fab97bdc@amd.com> <31febf08-e9c9-77fa-932d-a50505866ec4@amd.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <77efa177-f313-5f1e-e273-6672ed46a90a@gmail.com> Date: Wed, 19 May 2021 12:57:11 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Am 18.05.21 um 20:48 schrieb Andrey Grodzovsky: > [SNIP] >>> >>> Would this be the right way to do it ? >> >> Yes, it is at least a start. Question is if we can wait blocking here >> or not. >> >> We install a callback a bit lower to avoid blocking, so I'm pretty >> sure that won't work as expected. >> >> Christian. > > I can't see why this would create problems, as long as the dependencies > complete or force competed if they are from same device (extracted) but > on a different ring then looks to me it should work. I will give it > a try. Ok, but please also test the case for a killed process. Christian. > > Andrey