From 47f29df7db78ee4fcdb104cf36918d987ddd0278 Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Wed, 29 Oct 2014 14:50:29 -0700 Subject: drivers: of: add return value to of_reserved_mem_device_init() 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. This fixes a build warining caused by commit 7bfa5ab6fa1b ("drivers: dma-coherent: add initialization from device tree"), which has been merged without this change and without fixing function return value. Fixes: 7bfa5ab6fa1b1 ("drivers: dma-coherent: add initialization from device tree") Signed-off-by: Marek Szyprowski Acked-by: Arnd Bergmann Cc: Michal Nazarewicz Cc: Grant Likely Cc: Laura Abbott Cc: Josh Cartwright Cc: Joonsoo Kim Cc: Kyungmin Park Cc: Russell King Cc: Stephen Rothwell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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) { } -- cgit v1.2.3