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Kernel Upstream Group , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-aspeed@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-media@vger.kernel.org, openbmc@lists.ozlabs.org, linux-mediatek@lists.infradead.org, kernel@collabora.com, linux-tegra@vger.kernel.org, linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-staging@lists.linux.dev, linux-sound@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, imx@lists.linux.dev, sound-open-firmware@alsa-project.org, Konrad Dybcio , Mukesh Ojha Subject: [PATCH 01/42] of: reserved_mem: Introduce devres-managed initialization functions Date: Sat, 4 Jul 2026 01:08:14 +0530 Message-ID: <20260703193855.110619-2-mukesh.ojha@oss.qualcomm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260703193855.110619-1-mukesh.ojha@oss.qualcomm.com> References: <20260703193855.110619-1-mukesh.ojha@oss.qualcomm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzAzMDE5OCBTYWx0ZWRfX08n4g1VDGUQM OD4/4R/TSFml4Es3AMnaCQ/k8YLchWk2lVl9YhkPe8V+ybUyIRsWuGJfPDFSXA786wxOymo5NwN 6wIKUZk5o3RRzp80UuJVPkvQXxQFvpI= X-Authority-Analysis: v=2.4 cv=FOQrAeos c=1 sm=1 tr=0 ts=6a481007 cx=c_pps a=RP+M6JBNLl+fLTcSJhASfg==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=EUspDBNiAAAA:8 a=C96w-YAaP-Zupzk_Mv8A:9 a=iS9zxrgQBfv6-_F4QbHw:22 X-Proofpoint-ORIG-GUID: DHVLILM1BIXM_afy7Wg6FnJCuOcTuuJ1 X-Proofpoint-GUID: DHVLILM1BIXM_afy7Wg6FnJCuOcTuuJ1 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzAzMDE5OCBTYWx0ZWRfXzcP69Xf2lMNv yFGl/fEk21MphknBEtZRbPIocz1OwnBX4pu1e9NfpEJ5owbjVhk40o5/CxfOCYAUa4LfBUvNlkL euNF2RtHXRjoNpqZbRrdVbjfxZH7X2FelcZ04z0xcl9UnFfpEUgQRrwPEpOrHr+5eMMZk7BJVa/ 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X-CRM114-Status: GOOD ( 19.91 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org From: Konrad Dybcio Introduce devres-based helpers for of_reserved_mem_device_init(_by_idx) to help fight dangling references and ever so slightly reduce the number of boilerplate deinitialization calls. Signed-off-by: Konrad Dybcio Signed-off-by: Mukesh Ojha --- drivers/of/of_reserved_mem.c | 41 +++++++++++++++++++++++++++++++++ include/linux/of_reserved_mem.h | 25 ++++++++++++++++++++ 2 files changed, 66 insertions(+) diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index 82222bd45ac6..b35541e9fbe8 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -787,6 +787,47 @@ void of_reserved_mem_device_release(struct device *dev) } EXPORT_SYMBOL_GPL(of_reserved_mem_device_release); +static void devm_of_reserved_mem_device_release(struct device *dev, void *res) +{ + of_reserved_mem_device_release(*(struct device **)res); +} + +/** + * devm_of_reserved_mem_device_init_by_idx() - Resource managed of_reserved_mem_device_init_by_idx() + * @dev: Pointer to the device to configure + * @np: Pointer to the device node with 'memory-region' property + * @idx: Index of selected region + * + * This is a resource managed version of of_reserved_mem_device_init_by_idx(). + * The reserved memory region will be released automatically when the device + * is unbound. + * + * Returns: Negative errno on failure or zero on success. + */ +int devm_of_reserved_mem_device_init_by_idx(struct device *dev, + struct device_node *np, int idx) +{ + struct device **ptr; + int ret; + + ptr = devres_alloc(devm_of_reserved_mem_device_release, sizeof(*ptr), + GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + ret = of_reserved_mem_device_init_by_idx(dev, np, idx); + if (ret) { + devres_free(ptr); + return ret; + } + + *ptr = dev; + devres_add(dev, ptr); + + return 0; +} +EXPORT_SYMBOL_GPL(devm_of_reserved_mem_device_init_by_idx); + /** * of_reserved_mem_lookup() - acquire reserved_mem from a device node * @np: node pointer of the desired reserved-memory region diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h index e8b20b29fa68..b9fd78123d77 100644 --- a/include/linux/of_reserved_mem.h +++ b/include/linux/of_reserved_mem.h @@ -40,6 +40,9 @@ int of_reserved_mem_device_init_by_name(struct device *dev, const char *name); void of_reserved_mem_device_release(struct device *dev); +int devm_of_reserved_mem_device_init_by_idx(struct device *dev, + struct device_node *np, int idx); + struct reserved_mem *of_reserved_mem_lookup(struct device_node *np); int of_reserved_mem_region_to_resource(const struct device_node *np, unsigned int idx, struct resource *res); @@ -68,6 +71,13 @@ static inline int of_reserved_mem_device_init_by_name(struct device *dev, static inline void of_reserved_mem_device_release(struct device *pdev) { } +static inline int devm_of_reserved_mem_device_init_by_idx(struct device *dev, + struct device_node *np, + int idx) +{ + return -EOPNOTSUPP; +} + static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np) { return NULL; @@ -108,4 +118,19 @@ static inline int of_reserved_mem_device_init(struct device *dev) return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0); } +/** + * devm_of_reserved_mem_device_init() - Resource managed version of of_reserved_mem_device_init() + * @dev: Pointer to the device to configure + * + * This is a resource managed version of of_reserved_mem_device_init(). + * The reserved memory region will be released automatically when the device + * is unbound. + * + * Returns error code or zero on success. + */ +static inline int devm_of_reserved_mem_device_init(struct device *dev) +{ + return devm_of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0); +} + #endif /* __OF_RESERVED_MEM_H */ -- 2.53.0