{"id":2175613,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2175613/?format=json","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/1.0/projects/28/?format=json","name":"Linux PCI development","link_name":"linux-pci","list_id":"linux-pci.vger.kernel.org","list_email":"linux-pci@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20251218-dma_prep_config-v2-6-c07079836128@nxp.com>","date":"2025-12-18T15:56:26","name":"[v2,6/8] nvmet: pci-epf: Use dmaengine_prep_config_single_safe() API","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"61d0c481c57b71fb48666fe516d9d39d86394bdc","submitter":{"id":68011,"url":"http://patchwork.ozlabs.org/api/1.0/people/68011/?format=json","name":"Frank Li","email":"Frank.Li@nxp.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pci/patch/20251218-dma_prep_config-v2-6-c07079836128@nxp.com/mbox/","series":[{"id":485872,"url":"http://patchwork.ozlabs.org/api/1.0/series/485872/?format=json","date":"2025-12-18T15:56:20","name":"dmaengine: Add new API to combine onfiguration and descriptor preparation","version":2,"mbox":"http://patchwork.ozlabs.org/series/485872/mbox/"}],"check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2175613/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=nxp.com header.i=@nxp.com header.a=rsa-sha256\n header.s=selector1 header.b=IHfi/H/Z;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; 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Miller\" ,\n Nicolas Ferre ,\n Alexandre Belloni ,\n Claudiu Beznea , Koichiro Den ,\n Niklas Cassel ","Cc":"dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,\n linux-pci@vger.kernel.org, linux-nvme@lists.infradead.org,\n mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org,\n linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org,\n imx@lists.linux.dev, Frank Li ","X-Mailer":"b4 0.14.2","X-Developer-Signature":"v=1; a=ed25519-sha256; t=1766073392; l=1861;\n i=Frank.Li@nxp.com; s=20240130; h=from:subject:message-id;\n bh=nxyMYRFpqLMceFvkP3xrvPMquEbKBxsILsn5+eXX/u0=;\n b=JkhXNLxraVjHm6eSLbdxpXxWrHdaGTRysL7yFqELJqU9p9p7mpk/5hqkDyqQPqbreJ6GvNB4a\n izc7wwb193RAo+9X6F3/s4uJOEpzAivGAho1p5nJhBBgh/1tXwjSLRP","X-Developer-Key":"i=Frank.Li@nxp.com; a=ed25519;\n pk=I0L1sDUfPxpAkRvPKy7MdauTuSENRq+DnA+G4qcS94Q=","X-ClientProxiedBy":"PH8PR07CA0047.namprd07.prod.outlook.com\n (2603:10b6:510:2cf::10) To DU2PR04MB8951.eurprd04.prod.outlook.com\n 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d096fbb6-d576-42c8-d26d-08de3e4e1774","X-MS-Exchange-CrossTenant-AuthSource":"DU2PR04MB8951.eurprd04.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Internal","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"18 Dec 2025 15:57:05.6419\n (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":"\n BwfmYCtxQ/trx466t053ugpUL0LQPTNW5R2rKU2BRKLFvY+pNd5pti2QiieUG30SR5NJgT6uk0n7Y5UYklUeZg==","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"DU4PR04MB12130"},"content":"Use the new dmaengine_prep_config_single_safe() API to combine the\nconfiguration and descriptor preparation into a single call.\n\nSince dmaengine_prep_config_single_safe() performs the configuration and\npreparation atomically and dw edma driver implement prep_config_sg() call\nback, so dmaengine_prep_config_single() is reentriable, the mutex can be\nremoved.\n\nTested-by: Niklas Cassel \nSigned-off-by: Frank Li \n---\n drivers/nvme/target/pci-epf.c | 18 ++++--------------\n 1 file changed, 4 insertions(+), 14 deletions(-)","diff":"diff --git a/drivers/nvme/target/pci-epf.c b/drivers/nvme/target/pci-epf.c\nindex 56b1c6a7706a9e2dd9d8aaf17b440129b948486c..8b5ea5d4c79dfd461b767cfd4033a9e4604c94b1 100644\n--- a/drivers/nvme/target/pci-epf.c\n+++ b/drivers/nvme/target/pci-epf.c\n@@ -388,22 +388,15 @@ static int nvmet_pci_epf_dma_transfer(struct nvmet_pci_epf *nvme_epf,\n \t\treturn -EINVAL;\n \t}\n \n-\tmutex_lock(lock);\n-\n \tdma_dev = dmaengine_get_dma_device(chan);\n \tdma_addr = dma_map_single(dma_dev, seg->buf, seg->length, dir);\n \tret = dma_mapping_error(dma_dev, dma_addr);\n \tif (ret)\n-\t\tgoto unlock;\n-\n-\tret = dmaengine_slave_config(chan, &sconf);\n-\tif (ret) {\n-\t\tdev_err(dev, \"Failed to configure DMA channel\\n\");\n-\t\tgoto unmap;\n-\t}\n+\t\treturn ret;\n \n-\tdesc = dmaengine_prep_slave_single(chan, dma_addr, seg->length,\n-\t\t\t\t\t sconf.direction, DMA_CTRL_ACK);\n+\tdesc = dmaengine_prep_config_single_safe(chan, dma_addr, seg->length,\n+\t\t\t\t\t\t sconf.direction,\n+\t\t\t\t\t\t DMA_CTRL_ACK, &sconf);\n \tif (!desc) {\n \t\tdev_err(dev, \"Failed to prepare DMA\\n\");\n \t\tret = -EIO;\n@@ -426,9 +419,6 @@ static int nvmet_pci_epf_dma_transfer(struct nvmet_pci_epf *nvme_epf,\n unmap:\n \tdma_unmap_single(dma_dev, dma_addr, seg->length, dir);\n \n-unlock:\n-\tmutex_unlock(lock);\n-\n \treturn ret;\n }\n \n","prefixes":["v2","6/8"]}