From: Jon Hunter <jonathanh@nvidia.com>
To: "Dmitry Osipenko" <digetx@gmail.com>,
"Laxman Dewangan" <ldewangan@nvidia.com>,
"Vinod Koul" <vkoul@kernel.org>,
"Dan Williams" <dan.j.williams@intel.com>,
"Thierry Reding" <thierry.reding@gmail.com>,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>
Cc: <dmaengine@vger.kernel.org>, <linux-tegra@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 02/14] dmaengine: tegra-apb: Implement synchronization callback
Date: Wed, 15 Jan 2020 10:25:45 +0000 [thread overview]
Message-ID: <d07d3d64-8abd-e3d7-ca1c-01ab8607b8c2@nvidia.com> (raw)
In-Reply-To: <34ec4c18-f082-def6-8544-0d15a109d7f8@nvidia.com>
On 15/01/2020 09:18, Jon Hunter wrote:
>
> On 14/01/2020 21:02, Dmitry Osipenko wrote:
>> 14.01.2020 18:15, Jon Hunter пишет:
>>>
>>> On 12/01/2020 17:29, Dmitry Osipenko wrote:
>>>> The ISR tasklet could be kept scheduled after DMA transfer termination,
>>>> let's add synchronization callback which blocks until tasklet is finished.
>>>>
>>>> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
>>>> ---
>>>> drivers/dma/tegra20-apb-dma.c | 8 ++++++++
>>>> 1 file changed, 8 insertions(+)
>>>>
>>>> diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
>>>> index 319f31d27014..664e9c5df3ba 100644
>>>> --- a/drivers/dma/tegra20-apb-dma.c
>>>> +++ b/drivers/dma/tegra20-apb-dma.c
>>>> @@ -798,6 +798,13 @@ static int tegra_dma_terminate_all(struct dma_chan *dc)
>>>> return 0;
>>>> }
>>>>
>>>> +static void tegra_dma_synchronize(struct dma_chan *dc)
>>>> +{
>>>> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
>>>> +
>>>> + tasklet_kill(&tdc->tasklet);
>>>> +}
>>>> +
>>>
>>> Wouldn't there need to be some clean-up here? If the tasklet is
>>> scheduled, seems that there would be some other house-keeping that needs
>>> to be done after killing it.
>>
>> I'm not seeing anything to clean-up, could you please clarify?
>
> Clean-up with regard to the descriptors. I was concerned if you will the
> tasklet the necessary clean-up of the descriptors is not handled.
Ah I see that tasklet_kill, unlike tasklet_kill_immediate, does wait for
the tasklet to run if scheduled. OK, then this should be fine.
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Cheers
Jon
--
nvpublic
next prev parent reply other threads:[~2020-01-15 10:25 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-12 17:29 [PATCH v4 00/14] NVIDIA Tegra APB DMA driver fixes and improvements Dmitry Osipenko
2020-01-12 17:29 ` [PATCH v4 01/14] dmaengine: tegra-apb: Fix use-after-free Dmitry Osipenko
2020-01-14 15:09 ` Jon Hunter
2020-01-14 20:33 ` Dmitry Osipenko
2020-01-15 9:00 ` Jon Hunter
2020-01-16 20:10 ` Dmitry Osipenko
2020-01-28 14:02 ` Jon Hunter
2020-01-28 14:51 ` Dmitry Osipenko
2020-01-29 0:12 ` Dmitry Osipenko
2020-01-29 10:42 ` Jon Hunter
2020-01-12 17:29 ` [PATCH v4 02/14] dmaengine: tegra-apb: Implement synchronization callback Dmitry Osipenko
2020-01-14 15:15 ` Jon Hunter
2020-01-14 21:02 ` Dmitry Osipenko
2020-01-15 9:18 ` Jon Hunter
2020-01-15 10:25 ` Jon Hunter [this message]
2020-01-12 17:29 ` [PATCH v4 03/14] dmaengine: tegra-apb: Prevent race conditions on channel's freeing Dmitry Osipenko
2020-01-14 15:16 ` Jon Hunter
2020-01-12 17:29 ` [PATCH v4 04/14] dmaengine: tegra-apb: Clean up tasklet releasing Dmitry Osipenko
2020-01-14 15:36 ` Jon Hunter
2020-01-12 17:29 ` [PATCH v4 05/14] dmaengine: tegra-apb: Prevent race conditions of tasklet vs free list Dmitry Osipenko
2020-01-14 15:43 ` Jon Hunter
2020-01-12 17:29 ` [PATCH v4 06/14] dmaengine: tegra-apb: Use devm_platform_ioremap_resource Dmitry Osipenko
2020-01-14 15:44 ` Jon Hunter
2020-01-12 17:29 ` [PATCH v4 07/14] dmaengine: tegra-apb: Use devm_request_irq Dmitry Osipenko
2020-01-14 15:44 ` Jon Hunter
2020-01-12 17:30 ` [PATCH v4 08/14] dmaengine: tegra-apb: Fix coding style problems Dmitry Osipenko
2020-01-15 9:49 ` Jon Hunter
2020-01-16 17:37 ` Dmitry Osipenko
2020-01-28 14:05 ` Jon Hunter
2020-01-28 15:01 ` Dmitry Osipenko
2020-01-12 17:30 ` [PATCH v4 09/14] dmaengine: tegra-apb: Clean up runtime PM teardown Dmitry Osipenko
2020-01-15 9:57 ` Jon Hunter
2020-01-16 17:18 ` Dmitry Osipenko
2020-01-12 17:30 ` [PATCH v4 10/14] dmaengine: tegra-apb: Keep clock enabled only during of DMA transfer Dmitry Osipenko
2020-01-15 10:08 ` Jon Hunter
2020-01-16 17:01 ` Dmitry Osipenko
2020-01-12 17:30 ` [PATCH v4 11/14] dmaengine: tegra-apb: Clean up suspend-resume Dmitry Osipenko
2020-01-21 21:23 ` Dmitry Osipenko
2020-01-28 14:10 ` Jon Hunter
2020-01-28 14:53 ` Dmitry Osipenko
2020-01-12 17:30 ` [PATCH v4 12/14] dmaengine: tegra-apb: Add missing of_dma_controller_free Dmitry Osipenko
2020-01-15 10:10 ` Jon Hunter
2020-01-12 17:30 ` [PATCH v4 13/14] dmaengine: tegra-apb: Allow to compile as a loadable kernel module Dmitry Osipenko
2020-01-15 10:10 ` Jon Hunter
2020-01-12 17:30 ` [PATCH v4 14/14] dmaengine: tegra-apb: Remove MODULE_ALIAS Dmitry Osipenko
2020-01-15 10:11 ` Jon Hunter
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