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[174.29.1.49]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-85f1dbef224sm3990269a34.12.2026.11.07.02.16.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 07 Nov 2026 02:16:53 -0800 (PST) From: James Hilliard Date: Sat, 07 Nov 2026 03:16:07 -0700 Subject: [PATCH 10/58] mtd: rawnand: stm32_fmc2: retain open-handle state on removal X-Archived-By: MIME-Version: 1.0 Message-Id: <20261107-submit-rawnand-retained-handle-lifetime-v1-v1-10-0181ef0cc4c8@gmail.com> References: <20261107-submit-rawnand-retained-handle-lifetime-v1-v1-0-0181ef0cc4c8@gmail.com> In-Reply-To: <20261107-submit-rawnand-retained-handle-lifetime-v1-v1-0-0181ef0cc4c8@gmail.com> To: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Brian Norris , Boris Brezillon , Arseniy Krasnov , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Thomas Gleixner , Vitaly Wool , David Woodhouse , Russell King , David Woodhouse , Mike Rapoport , Maxime Coquelin , Alexandre Torgue , Christophe Kerello , Jason Roberts , Michal Simek , Boris Brezillon , Mason Yang , Ramuthevar Vadivel Murugan , Stefan Agner , Lucas Stach , Thierry Reding , Jonathan Hunter , Dmitry Osipenko , Matthias Brugger , AngeloGioacchino Del Regno , Jorge Ramirez-Ortiz , Heiko Stuebner , Yifeng Zhao , Nicolas Ferre , Alexandre Belloni , Claudiu Beznea , Keguang Zhang , Jacky Huang , Shan-Chun Hung , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Han Xu , Liang Yang , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Manivannan Sadhasivam , Kamal Dasu , Broadcom internal kernel review list , Vladimir Zapolskiy , Piotr Wojtaszczyk , Paul Cercueil , Harvey Hunt , Maxim Levitsky , Michael Walle , Srinivas Kandagatla Cc: Tze Yee Ng , linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-mips@vger.kernel.org, imx@lists.linux.dev, linux-renesas-soc@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-msm@vger.kernel.org, James Hilliard X-Mailer: b4 0.15.2 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261107_101655_805079_9F69F249 X-CRM114-Status: GOOD ( 17.38 ) X-Spam-Score: 0.1 (/) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-amlogic" X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Keep the embedded NAND chip and controller serialization state alive for MTD references that survive unbind. Disconnect operations before releasing DMA channels and scatterlists and asserting write protection; defer NAND metadata cleanup and controller storage release until the final reference. Preserve immediate cleanup before publication and use the retained lifetime after MTD registration has been attempted. Fixes: 2cd457f328c1 ("mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver") Signed-off-by: James Hilliard --- drivers/mtd/nand/raw/stm32_fmc2_nand.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c index 9f42f8ab3212..4b89094c89e6 100644 --- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c +++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c @@ -1902,6 +1902,11 @@ static int stm32_fmc2_nfc_set_cdev(struct stm32_fmc2_nfc *nfc) return 0; } +static void stm32_fmc2_nfc_release(struct nand_controller *controller) +{ + kfree(container_of(controller, struct stm32_fmc2_nfc, base)); +} + static int stm32_fmc2_nfc_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -1915,12 +1920,14 @@ static int stm32_fmc2_nfc_probe(struct platform_device *pdev) int chip_cs, mem_region, ret, irq; int start_region = 0; - nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL); + nfc = kzalloc_obj(*nfc); if (!nfc) return -ENOMEM; + ret = devm_nand_controller_init(dev, &nfc->base, stm32_fmc2_nfc_release); + if (ret) + return ret; nfc->dev = dev; - nand_controller_init(&nfc->base); nfc->base.ops = &stm32_fmc2_nfc_controller_ops; nfc->data = of_device_get_match_data(dev); @@ -2024,9 +2031,15 @@ static int stm32_fmc2_nfc_probe(struct platform_device *pdev) if (ret) goto err_wp_enable; - ret = mtd_device_register(mtd, NULL, 0); + ret = nand_set_release(chip, NULL); if (ret) goto err_nand_cleanup; + ret = mtd_device_register(mtd, NULL, 0); + if (ret) { + nand_disconnect(chip); + mtd_put_master(mtd); + goto err_wp_enable; + } platform_set_drvdata(pdev, nfc); @@ -2061,7 +2074,7 @@ static void stm32_fmc2_nfc_remove(struct platform_device *pdev) ret = mtd_device_unregister(nand_to_mtd(chip)); WARN_ON(ret); - nand_cleanup(chip); + nand_disconnect(chip); if (nfc->dma_ecc_ch) dma_release_channel(nfc->dma_ecc_ch); @@ -2074,6 +2087,7 @@ static void stm32_fmc2_nfc_remove(struct platform_device *pdev) sg_free_table(&nfc->dma_ecc_sg); stm32_fmc2_nfc_wp_enable(nand); + mtd_put_master(nand_to_mtd(chip)); } static int stm32_fmc2_nfc_suspend(struct device *dev) -- 2.53.0 _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic