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Received: from DU0PR04MB9417.eurprd04.prod.outlook.com (2603:10a6:10:358::11) by AM9PR04MB8273.eurprd04.prod.outlook.com (2603:10a6:20b:3e5::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6363.26; Thu, 4 May 2023 07:52:55 +0000 Received: from DU0PR04MB9417.eurprd04.prod.outlook.com ([fe80::b999:f2c6:a8cc:7b4]) by DU0PR04MB9417.eurprd04.prod.outlook.com ([fe80::b999:f2c6:a8cc:7b4%5]) with mapi id 15.20.6340.031; Thu, 4 May 2023 07:52:55 +0000 From: "Peng Fan (OSS)" To: gregkh@linuxfoundation.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, rafael@kernel.org, andriy.shevchenko@linux.intel.com, hdegoede@redhat.com, jgg@ziepe.ca, saravanak@google.com, keescook@chromium.org, tglx@linutronix.de Cc: linux-kernel@vger.kernel.org, abel.vesa@linaro.org, Peng Fan Subject: [PATCH] devres: provide API devm_kstrndup Date: Thu, 4 May 2023 15:57:54 +0800 Message-Id: <20230504075754.372780-1-peng.fan@oss.nxp.com> X-Mailer: git-send-email 2.37.1 X-ClientProxiedBy: SG2P153CA0034.APCP153.PROD.OUTLOOK.COM (2603:1096:4:c7::21) To DU0PR04MB9417.eurprd04.prod.outlook.com (2603:10a6:10:358::11) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DU0PR04MB9417:EE_|AM9PR04MB8273:EE_ X-MS-Office365-Filtering-Correlation-Id: d9a77a42-0a46-452a-1436-08db4c7491f3 X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Signed-off-by: Peng Fan --- drivers/base/devres.c | 28 ++++++++++++++++++++++++++++ include/linux/device.h | 1 + 2 files changed, 29 insertions(+) diff --git a/drivers/base/devres.c b/drivers/base/devres.c index 5c998cfac335..87e2965e5bab 100644 --- a/drivers/base/devres.c +++ b/drivers/base/devres.c @@ -963,6 +963,34 @@ char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) } EXPORT_SYMBOL_GPL(devm_kstrdup); +/** + * devm_kstrndup - Allocate resource managed space and + * copy an existing string into that. + * @dev: Device to allocate memory for + * @s: the string to duplicate + * @max: max length to duplicate + * @gfp: the GFP mask used in the devm_kmalloc() call when allocating memory + * RETURNS: + * Pointer to allocated string on success, NULL on failure. + */ +char *devm_kstrndup(struct device *dev, const char *s, size_t max, gfp_t gfp) +{ + size_t len; + char *buf; + + if (!s) + return NULL; + + len = strnlen(s, max); + buf = devm_kmalloc(dev, len + 1, gfp); + if (buf) { + memcpy(buf, s, len); + buf[len] = '\0'; + } + return buf; +} +EXPORT_SYMBOL_GPL(devm_kstrndup); + /** * devm_kstrdup_const - resource managed conditional string duplication * @dev: device for which to duplicate the string diff --git a/include/linux/device.h b/include/linux/device.h index 472dd24d4823..56b092883c64 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -226,6 +226,7 @@ static inline void *devm_kcalloc(struct device *dev, void devm_kfree(struct device *dev, const void *p); char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc; const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp); +char *devm_kstrndup(struct device *dev, const char *s, size_t max, gfp_t gfp) __malloc; void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp) __realloc_size(3);