From: Robin Gong <yibin.gong@nxp.com> To: 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, l.stach@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: [PATCH v16 12/12] dmaengine: imx-sdma: add terminated list for freed descriptor in worker Date: Wed, 14 Jul 2021 18:20:52 +0800 [thread overview] Message-ID: <1626258052-22198-13-git-send-email-yibin.gong@nxp.com> (raw) In-Reply-To: <1626258052-22198-1-git-send-email-yibin.gong@nxp.com> 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 9ec1edf..cacc725 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -439,6 +439,7 @@ 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; }; @@ -1107,9 +1108,6 @@ 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 @@ -1118,10 +1116,7 @@ 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) @@ -1135,6 +1130,13 @@ 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); } @@ -2130,6 +2132,7 @@ 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); /* -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Robin Gong <yibin.gong@nxp.com> To: 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, l.stach@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: [PATCH v16 12/12] dmaengine: imx-sdma: add terminated list for freed descriptor in worker Date: Wed, 14 Jul 2021 18:20:52 +0800 [thread overview] Message-ID: <1626258052-22198-13-git-send-email-yibin.gong@nxp.com> (raw) In-Reply-To: <1626258052-22198-1-git-send-email-yibin.gong@nxp.com> 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 9ec1edf..cacc725 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -439,6 +439,7 @@ 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; }; @@ -1107,9 +1108,6 @@ 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 @@ -1118,10 +1116,7 @@ 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) @@ -1135,6 +1130,13 @@ 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); } @@ -2130,6 +2132,7 @@ 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); /* -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-07-14 2:05 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-14 10:20 [PATCH v16 00/12] add ecspi ERR009165 for i.mx6/7 soc family Robin Gong 2021-07-14 10:20 ` Robin Gong 2021-07-14 9:05 ` Lucas Stach 2021-07-14 9:05 ` Lucas Stach 2021-07-20 12:22 ` Vinod Koul 2021-07-20 12:22 ` Vinod Koul 2021-07-14 10:20 ` [PATCH v16 01/12] Revert "ARM: dts: imx6q: Use correct SDMA script for SPI5 core" Robin Gong 2021-07-14 10:20 ` Robin Gong 2021-07-14 10:20 ` [PATCH v16 02/12] Revert "ARM: dts: imx6: Use correct SDMA script for SPI cores" Robin Gong 2021-07-14 10:20 ` Robin Gong 2021-07-14 10:20 ` [PATCH v16 03/12] Revert "dmaengine: imx-sdma: refine to load context only once" Robin Gong 2021-07-14 10:20 ` Robin Gong 2021-07-14 10:20 ` [PATCH v16 04/12] dmaengine: imx-sdma: remove duplicated sdma_load_context Robin Gong 2021-07-14 10:20 ` Robin Gong 2021-07-14 10:20 ` [PATCH v16 05/12] dmaengine: dma: imx-sdma: add fw_loaded and is_ram_script Robin Gong 2021-07-14 10:20 ` Robin Gong 2021-07-14 8:17 ` Lucas Stach 2021-07-14 8:17 ` Lucas Stach 2021-07-14 10:20 ` [PATCH v16 06/12] dmaengine: imx-sdma: add mcu_2_ecspi script Robin Gong 2021-07-14 10:20 ` Robin Gong 2021-07-14 10:20 ` [PATCH v16 07/12] spi: imx: fix ERR009165 Robin Gong 2021-07-14 10:20 ` Robin Gong 2021-07-14 10:20 ` [PATCH v16 08/12] spi: imx: remove ERR009165 workaround on i.mx6ul Robin Gong 2021-07-14 10:20 ` Robin Gong 2021-07-14 10:20 ` [PATCH v16 09/12] dmaengine: imx-sdma: remove ERR009165 " Robin Gong 2021-07-14 10:20 ` Robin Gong 2021-07-14 8:17 ` Lucas Stach 2021-07-14 8:17 ` Lucas Stach 2021-07-14 10:20 ` [PATCH v16 10/12] dma: imx-sdma: add i.mx6ul compatible name Robin Gong 2021-07-14 10:20 ` Robin Gong 2021-07-14 10:20 ` [PATCH v16 11/12] dmaengine: imx-sdma: add uart rom script Robin Gong 2021-07-14 10:20 ` Robin Gong 2021-07-14 10:20 ` Robin Gong [this message] 2021-07-14 10:20 ` [PATCH v16 12/12] dmaengine: imx-sdma: add terminated list for freed descriptor in worker Robin Gong 2021-07-23 3:20 ` [PATCH v16 00/12] add ecspi ERR009165 for i.mx6/7 soc family Shawn Guo 2021-07-23 3:20 ` Shawn Guo
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