[PATCH v4] drivers: of: add return value to of_reserved_mem_device_init
From: m.szyprowski@samsung.com (Marek Szyprowski)
Date: 2014-10-15 11:01:53
Also in:
lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, open firmware and flattened device tree, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Rob Herring, Saravana Kannan, Linus Torvalds
Driver calling of_reserved_mem_device_init() might be interested if the
initialization has been successful or not, so add support for returning
error code.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
This patch fixes build warining caused by commit
7bfa5ab6fa1b18f53fb94f922e107e6fbdc5e485 ("drivers: dma-coherent: add
initialization from device tree"), which has been merged without this
change and without fixing function return value.
---
drivers/base/dma-contiguous.c | 3 ++-
drivers/of/of_reserved_mem.c | 14 +++++++++-----
include/linux/of_reserved_mem.h | 9 ++++++---
3 files changed, 17 insertions(+), 9 deletions(-)
diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 473ff4892401..950fff9ce453 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c@@ -223,9 +223,10 @@ bool dma_release_from_contiguous(struct device *dev, struct page *pages, #undef pr_fmt #define pr_fmt(fmt) fmt -static void rmem_cma_device_init(struct reserved_mem *rmem, struct device *dev) +static int rmem_cma_device_init(struct reserved_mem *rmem, struct device *dev) { dev_set_cma_area(dev, rmem->priv); + return 0; } static void rmem_cma_device_release(struct reserved_mem *rmem,
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 59fb12e84e6b..dc566b38645f 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c@@ -243,23 +243,27 @@ static inline struct reserved_mem *__find_rmem(struct device_node *node) * This function assign memory region pointed by "memory-region" device tree * property to the given device. */ -void of_reserved_mem_device_init(struct device *dev) +int of_reserved_mem_device_init(struct device *dev) { struct reserved_mem *rmem; struct device_node *np; + int ret; np = of_parse_phandle(dev->of_node, "memory-region", 0); if (!np) - return; + return -ENODEV; rmem = __find_rmem(np); of_node_put(np); if (!rmem || !rmem->ops || !rmem->ops->device_init) - return; + return -EINVAL; + + ret = rmem->ops->device_init(rmem, dev); + if (ret == 0) + dev_info(dev, "assigned reserved memory node %s\n", rmem->name); - rmem->ops->device_init(rmem, dev); - dev_info(dev, "assigned reserved memory node %s\n", rmem->name); + return ret; } /**
diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h
index 5b5efae09135..ad2f67054372 100644
--- a/include/linux/of_reserved_mem.h
+++ b/include/linux/of_reserved_mem.h@@ -16,7 +16,7 @@ struct reserved_mem { }; struct reserved_mem_ops { - void (*device_init)(struct reserved_mem *rmem, + int (*device_init)(struct reserved_mem *rmem, struct device *dev); void (*device_release)(struct reserved_mem *rmem, struct device *dev);
@@ -28,14 +28,17 @@ typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem); _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn) #ifdef CONFIG_OF_RESERVED_MEM -void of_reserved_mem_device_init(struct device *dev); +int of_reserved_mem_device_init(struct device *dev); void of_reserved_mem_device_release(struct device *dev); void fdt_init_reserved_mem(void); void fdt_reserved_mem_save_node(unsigned long node, const char *uname, phys_addr_t base, phys_addr_t size); #else -static inline void of_reserved_mem_device_init(struct device *dev) { } +static inline int of_reserved_mem_device_init(struct device *dev) +{ + return -ENOSYS; +} static inline void of_reserved_mem_device_release(struct device *pdev) { } static inline void fdt_init_reserved_mem(void) { }
--
1.9.2