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Mon, 31 Aug 2020 07:51:49 +0000 From: Robin Gong To: mark.rutland@arm.com, broonie@kernel.org, robh+dt@kernel.org, catalin.marinas@arm.com, vkoul@kernel.org, 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, r.schwebel@pengutronix.de, Benjamin.Bara@skidata.com, Richard.Leitner@skidata.com Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de, dmaengine@vger.kernel.org, linux-imx@nxp.com Subject: [PATCH v13 12/12] dmaengine: imx-sdma: add terminated list for freed descriptor in worker Date: Tue, 1 Sep 2020 00:03:25 +0800 Message-Id: <1598889805-30399-13-git-send-email-yibin.gong@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1598889805-30399-1-git-send-email-yibin.gong@nxp.com> References: <1598889805-30399-1-git-send-email-yibin.gong@nxp.com> Content-Type: text/plain X-ClientProxiedBy: SG2PR02CA0104.apcprd02.prod.outlook.com (2603:1096:4:92::20) To VE1PR04MB6638.eurprd04.prod.outlook.com (2603:10a6:803:119::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from robin-OptiPlex-790.ap.freescale.net (119.31.174.67) by SG2PR02CA0104.apcprd02.prod.outlook.com (2603:1096:4:92::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.3326.20 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: adaeed96-9aeb-4452-bbca-08d84d82b795 X-MS-Exchange-CrossTenant-AuthSource: VE1PR04MB6638.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Aug 2020 07:51:49.6804 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: xFcnaYsfq+DCRL7/qC2/tBTOohst/Kzd95qHwHa1NyUW8fqs98b/oRVFE2ijCKCWsxDJ+fdf7qCH0d0wRIoXIQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB5694 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Reported-by: Richard Leitner --- 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 9bb6270..2fa8733 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; }; @@ -1076,9 +1077,6 @@ 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 @@ -1087,10 +1085,7 @@ 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) @@ -1104,6 +1099,13 @@ 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); } @@ -2124,6 +2126,7 @@ 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