[{"id":3650003,"web_url":"http://patchwork.ozlabs.org/comment/3650003/","msgid":"","list_archive_url":null,"date":"2026-02-13T15:46:42","subject":"Re: [PATCH v2 1/6] reboot-mode: Use actual cell size instead of\n sizeof(u32)","submitter":{"id":64621,"url":"http://patchwork.ozlabs.org/api/people/64621/","name":"Sean Anderson","email":"seanga2@gmail.com"},"content":"On 2/13/26 06:27, Aswin Murugan wrote:\n> The nvmem reboot-mode driver hardcodes sizeof(u32) for NVMEM read/write\n> operations. This fails on platforms where the reboot reason storage is\n> smaller than 4 bytes.\n> \n> On Qualcomm platforms with single-byte PMIC register storage, attempting\n> to read 4 bytes from a 1-byte cell causes the NVMEM subsystem to return\n> -EINVAL, breaking reboot-mode functionality.\n> \n> Replace sizeof(*mode) and sizeof(mode) with priv->cell.size to use the\n> actual NVMEM cell size. Also initialize *mode to 0 in reboot_mode_get()\n> to ensure a clean state for cells smaller than u32.\n> \n> This allows the driver to work with cells of any size, from single bytes\n> to multi-byte words.\n> \n> Signed-off-by: Aswin Murugan \n> ---\n> drivers/reboot-mode/reboot-mode-nvmem.c | 5 +++--\n> 1 file changed, 3 insertions(+), 2 deletions(-)\n> \n> diff --git a/drivers/reboot-mode/reboot-mode-nvmem.c b/drivers/reboot-mode/reboot-mode-nvmem.c\n> index b9af242520a..60307cce49f 100644\n> --- a/drivers/reboot-mode/reboot-mode-nvmem.c\n> +++ b/drivers/reboot-mode/reboot-mode-nvmem.c\n> @@ -18,15 +18,16 @@ struct nvmem_reboot_mode_priv {\n> static int reboot_mode_get(struct udevice *dev, u32 *mode)\n> {\n> \tstruct nvmem_reboot_mode_priv *priv = dev_get_priv(dev);\n> +\t*mode = 0;\n> \n> -\treturn nvmem_cell_read(&priv->cell, mode, sizeof(*mode));\n> +\treturn nvmem_cell_read(&priv->cell, mode, priv->cell.size);\n> }\n> \n> static int reboot_mode_set(struct udevice *dev, u32 mode)\n> {\n> \tstruct nvmem_reboot_mode_priv *priv = dev_get_priv(dev);\n> \n> -\treturn nvmem_cell_write(&priv->cell, &mode, sizeof(mode));\n> +\treturn nvmem_cell_write(&priv->cell, &mode, priv->cell.size);\n> }\n> \n> static const struct reboot_mode_ops nvmem_reboot_mode_ops = {\n\nI'm not sure about this. drivers/power/reset/nvmem-reboot-mode.c in Linux\nalways writes sizeof(unsigned long), and this is checked against the nvmem\ncell length in __nvmem_cell_entry_write. We should try to keep our behavior\nclose to Linux's.\n\n--Sean","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20230601 header.b=Hq/Gy+th;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=gmail.com","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.b=\"Hq/Gy+th\";\n\tdkim-atps=neutral","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=gmail.com","phobos.denx.de;\n spf=pass smtp.mailfrom=seanga2@gmail.com"],"Received":["from phobos.denx.de (phobos.denx.de\n [IPv6:2a01:238:438b:c500:173d:9f52:ddab:ee01])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fCGkS1Vrcz1xr1\n\tfor ; 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Linux x86_64; rv:91.0) Gecko/20100101\n Thunderbird/91.11.0","Subject":"Re: [PATCH v2 1/6] reboot-mode: Use actual cell size instead of\n sizeof(u32)","Content-Language":"en-US","To":"Aswin Murugan , u-boot@lists.denx.de,\n sumit.garg@kernel.org, casey.connolly@linaro.org, u-boot-qcom@groups.io","Cc":"trini@konsulko.com, marek.vasut+renesas@mailbox.org,\n neil.armstrong@linaro.org, peng.fan@nxp.com, quentin.schulz@cherry.de,\n n-francis@ti.com, xypron.glpk@gmx.de, h-vm@ti.com, justin@tidylabs.net,\n jamie.gibbons@microchip.com, ycliang@andestech.com, me@samcday.com,\n sughosh.ganu@arm.com, gchan9527@gmail.com, ilias.apalodimas@linaro.org","References":"<20260213112717.1256823-1-aswin.murugan@oss.qualcomm.com>\n <20260213112717.1256823-2-aswin.murugan@oss.qualcomm.com>","From":"Sean Anderson ","In-Reply-To":"<20260213112717.1256823-2-aswin.murugan@oss.qualcomm.com>","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"}},{"id":3650245,"web_url":"http://patchwork.ozlabs.org/comment/3650245/","msgid":"<250c54fc-4838-7280-7fd2-f5e7b444ef9d@gmail.com>","list_archive_url":null,"date":"2026-02-14T02:55:44","subject":"Re: [PATCH v2 1/6] reboot-mode: Use actual cell size instead of\n sizeof(u32)","submitter":{"id":64621,"url":"http://patchwork.ozlabs.org/api/people/64621/","name":"Sean Anderson","email":"seanga2@gmail.com"},"content":"On 2/13/26 10:46, Sean Anderson wrote:\n> On 2/13/26 06:27, Aswin Murugan wrote:\n>> The nvmem reboot-mode driver hardcodes sizeof(u32) for NVMEM read/write\n>> operations. This fails on platforms where the reboot reason storage is\n>> smaller than 4 bytes.\n>>\n>> On Qualcomm platforms with single-byte PMIC register storage, attempting\n>> to read 4 bytes from a 1-byte cell causes the NVMEM subsystem to return\n>> -EINVAL, breaking reboot-mode functionality.\n>>\n>> Replace sizeof(*mode) and sizeof(mode) with priv->cell.size to use the\n>> actual NVMEM cell size. Also initialize *mode to 0 in reboot_mode_get()\n>> to ensure a clean state for cells smaller than u32.\n>>\n>> This allows the driver to work with cells of any size, from single bytes\n>> to multi-byte words.\n>>\n>> Signed-off-by: Aswin Murugan \n>> ---\n>>   drivers/reboot-mode/reboot-mode-nvmem.c | 5 +++--\n>>   1 file changed, 3 insertions(+), 2 deletions(-)\n>>\n>> diff --git a/drivers/reboot-mode/reboot-mode-nvmem.c b/drivers/reboot-mode/reboot-mode-nvmem.c\n>> index b9af242520a..60307cce49f 100644\n>> --- a/drivers/reboot-mode/reboot-mode-nvmem.c\n>> +++ b/drivers/reboot-mode/reboot-mode-nvmem.c\n>> @@ -18,15 +18,16 @@ struct nvmem_reboot_mode_priv {\n>>   static int reboot_mode_get(struct udevice *dev, u32 *mode)\n>>   {\n>>       struct nvmem_reboot_mode_priv *priv = dev_get_priv(dev);\n>> +    *mode = 0;\n>> -    return nvmem_cell_read(&priv->cell, mode, sizeof(*mode));\n>> +    return nvmem_cell_read(&priv->cell, mode, priv->cell.size);\n>>   }\n>>   static int reboot_mode_set(struct udevice *dev, u32 mode)\n>>   {\n>>       struct nvmem_reboot_mode_priv *priv = dev_get_priv(dev);\n>> -    return nvmem_cell_write(&priv->cell, &mode, sizeof(mode));\n>> +    return nvmem_cell_write(&priv->cell, &mode, priv->cell.size);\n>>   }\n>>   static const struct reboot_mode_ops nvmem_reboot_mode_ops = {\n> \n> I'm not sure about this. drivers/power/reset/nvmem-reboot-mode.c in Linux\n> always writes sizeof(unsigned long), and this is checked against the nvmem\n> cell length in __nvmem_cell_entry_write. We should try to keep our behavior\n> close to Linux's.\n> \n> --Sean\n\nActually, NACK since this smashes the stack with a cell size that is larger than 4.\n\n--Sean","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20230601 header.b=iggEyr+B;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=gmail.com","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.b=\"iggEyr+B\";\n\tdkim-atps=neutral","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=gmail.com","phobos.denx.de;\n spf=pass smtp.mailfrom=seanga2@gmail.com"],"Received":["from phobos.denx.de (phobos.denx.de\n [IPv6:2a01:238:438b:c500:173d:9f52:ddab:ee01])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fCYZK6Ycrz1xpY\n\tfor ; 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Linux x86_64; rv:91.0) Gecko/20100101\n Thunderbird/91.11.0","Subject":"Re: [PATCH v2 1/6] reboot-mode: Use actual cell size instead of\n sizeof(u32)","Content-Language":"en-US","From":"Sean Anderson ","To":"Aswin Murugan , u-boot@lists.denx.de,\n sumit.garg@kernel.org, casey.connolly@linaro.org, u-boot-qcom@groups.io","Cc":"trini@konsulko.com, marek.vasut+renesas@mailbox.org,\n neil.armstrong@linaro.org, peng.fan@nxp.com, quentin.schulz@cherry.de,\n n-francis@ti.com, xypron.glpk@gmx.de, h-vm@ti.com, justin@tidylabs.net,\n jamie.gibbons@microchip.com, ycliang@andestech.com, me@samcday.com,\n sughosh.ganu@arm.com, gchan9527@gmail.com, ilias.apalodimas@linaro.org","References":"<20260213112717.1256823-1-aswin.murugan@oss.qualcomm.com>\n <20260213112717.1256823-2-aswin.murugan@oss.qualcomm.com>\n ","In-Reply-To":"","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"base64","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"}}]