From: Lucas Stach <l.stach@pengutronix.de>
To: Robin Gong <yibin.gong@nxp.com>,
vkoul@kernel.org, mark.rutland@arm.com, broonie@kernel.org,
robh+dt@kernel.org, catalin.marinas@arm.com, will.deacon@arm.com,
shawnguo@kernel.org, festevam@gmail.com, s.hauer@pengutronix.de,
martin.fuzzey@flowbird.group, u.kleine-koenig@pengutronix.de,
dan.j.williams@intel.com, matthias.schiffer@ew.tq-group.com,
frieder.schrempf@kontron.de, m.felsch@pengutronix.de,
xiaoning.wang@nxp.com
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-spi@vger.kernel.org, linux-imx@nxp.com,
kernel@pengutronix.de, dmaengine@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v14 12/12] dmaengine: imx-sdma: add terminated list for freed descriptor in worker
Date: Fri, 09 Jul 2021 11:55:39 +0200 [thread overview]
Message-ID: <e32fab57681a54cab609f0130b474b2c08c31e5f.camel@pengutronix.de> (raw)
In-Reply-To: <1617809456-17693-13-git-send-email-yibin.gong@nxp.com>
Am Mittwoch, dem 07.04.2021 um 23:30 +0800 schrieb Robin Gong:
> Add terminated list for keeping descriptor so that it could be freed in
> worker without any potential involving next descriptor raised up before
> this descriptor freed, because vchan_get_all_descriptors get all
> descriptors including the last terminated descriptor and the next
> descriptor, hence, the next descriptor maybe freed unexpectly when it's
> done in worker without this patch.
> https://www.spinics.net/lists/dmaengine/msg23367.html
>
> Signed-off-by: Robin Gong <yibin.gong@nxp.com>
> Reported-by: Richard Leitner <richard.leitner@skidata.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
> ---
> drivers/dma/imx-sdma.c | 17 ++++++++++-------
> 1 file changed, 10 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
> index 9519b41..4174580 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -381,6 +381,7 @@ struct sdma_channel {
> enum dma_status status;
> struct imx_dma_data data;
> struct work_struct terminate_worker;
> + struct list_head terminated;
> bool is_ram_script;
> };
>
> @@ -1041,9 +1042,6 @@ static void sdma_channel_terminate_work(struct work_struct *work)
> {
> struct sdma_channel *sdmac = container_of(work, struct sdma_channel,
> terminate_worker);
> - unsigned long flags;
> - LIST_HEAD(head);
> -
> /*
> * According to NXP R&D team a delay of one BD SDMA cost time
> * (maximum is 1ms) should be added after disable of the channel
> @@ -1052,10 +1050,7 @@ static void sdma_channel_terminate_work(struct work_struct *work)
> */
> usleep_range(1000, 2000);
>
> - spin_lock_irqsave(&sdmac->vc.lock, flags);
> - vchan_get_all_descriptors(&sdmac->vc, &head);
> - spin_unlock_irqrestore(&sdmac->vc.lock, flags);
> - vchan_dma_desc_free_list(&sdmac->vc, &head);
> + vchan_dma_desc_free_list(&sdmac->vc, &sdmac->terminated);
> }
>
> static int sdma_terminate_all(struct dma_chan *chan)
> @@ -1069,6 +1064,13 @@ static int sdma_terminate_all(struct dma_chan *chan)
>
> if (sdmac->desc) {
> vchan_terminate_vdesc(&sdmac->desc->vd);
> + /*
> + * move out current descriptor into terminated list so that
> + * it could be free in sdma_channel_terminate_work alone
> + * later without potential involving next descriptor raised
> + * up before the last descriptor terminated.
> + */
> + vchan_get_all_descriptors(&sdmac->vc, &sdmac->terminated);
> sdmac->desc = NULL;
> schedule_work(&sdmac->terminate_worker);
> }
> @@ -2075,6 +2077,7 @@ static int sdma_probe(struct platform_device *pdev)
>
> sdmac->channel = i;
> sdmac->vc.desc_free = sdma_desc_free;
> + INIT_LIST_HEAD(&sdmac->terminated);
> INIT_WORK(&sdmac->terminate_worker,
> sdma_channel_terminate_work);
> /*
next prev parent reply other threads:[~2021-07-09 9:55 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 15:30 [PATCH v14 00/12] add ecspi ERR009165 for i.mx6/7 soc family Robin Gong
2021-04-07 15:30 ` [PATCH v14 01/12] Revert "ARM: dts: imx6q: Use correct SDMA script for SPI5 core" Robin Gong
2021-04-07 15:30 ` [PATCH v14 02/12] Revert "ARM: dts: imx6: Use correct SDMA script for SPI cores" Robin Gong
2021-04-07 15:30 ` [PATCH v14 03/12] Revert "dmaengine: imx-sdma: refine to load context only once" Robin Gong
2021-04-07 15:30 ` [PATCH v14 04/12] dmaengine: imx-sdma: remove duplicated sdma_load_context Robin Gong
2021-04-07 15:30 ` [PATCH v14 05/12] dmaengine: dma: imx-sdma: add fw_loaded and is_ram_script Robin Gong
2021-07-09 9:24 ` Lucas Stach
2021-07-12 3:20 ` Robin Gong
2021-04-07 15:30 ` [PATCH v14 06/12] dmaengine: imx-sdma: add mcu_2_ecspi script Robin Gong
2021-07-09 9:32 ` Lucas Stach
2021-04-07 15:30 ` [PATCH v14 07/12] spi: imx: fix ERR009165 Robin Gong
2021-07-09 9:35 ` Lucas Stach
2021-04-07 15:30 ` [PATCH v14 08/12] spi: imx: remove ERR009165 workaround on i.mx6ul Robin Gong
2021-07-09 9:41 ` Lucas Stach
2021-07-12 3:48 ` Robin Gong
2021-07-12 9:30 ` Lucas Stach
2021-07-13 9:12 ` Robin Gong
2021-07-13 9:30 ` Lucas Stach
2021-04-07 15:30 ` [PATCH v14 09/12] dmaengine: imx-sdma: remove ERR009165 " Robin Gong
2021-07-09 9:44 ` Lucas Stach
2021-07-12 4:03 ` Robin Gong
2021-07-12 9:33 ` Lucas Stach
2021-07-13 9:14 ` Robin Gong
2021-04-07 15:30 ` [PATCH v14 10/12] dma: imx-sdma: add i.mx6ul compatible name Robin Gong
2021-04-07 15:30 ` [PATCH v14 11/12] dmaengine: imx-sdma: add uart rom script Robin Gong
2021-07-09 9:55 ` Lucas Stach
2021-04-07 15:30 ` [PATCH v14 12/12] dmaengine: imx-sdma: add terminated list for freed descriptor in worker Robin Gong
2021-04-12 9:39 ` Vinod Koul
2021-04-13 5:05 ` Robin Gong
2021-06-15 6:06 ` Vinod Koul
2021-07-09 9:55 ` Lucas Stach [this message]
2021-06-11 13:51 ` [PATCH v14 00/12] add ecspi ERR009165 for i.mx6/7 soc family Fabio Estevam
2021-06-15 1:55 ` Robin Gong
2021-06-15 6:07 ` Vinod Koul
2021-06-15 6:36 ` Robin Gong
2021-06-15 12:07 ` Vinod Koul
2021-06-15 14:10 ` Robin Gong
2021-06-16 10:16 ` Vinod Koul
2021-06-16 10:44 ` Robin Gong
2021-06-15 2:12 ` Fabio Estevam
2021-06-15 2:17 ` Robin Gong
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