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Message-Id: <20141015133959.dd2814e196eaa3fc3bcb7b93@linux-foundation.org>
Date: Wed, 15 Oct 2014 13:39:59 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Felipe Balbi <balbi@...com>
Cc: Greg KH <gregkh@...uxfoundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Arnd Bergmann <arnd@...db.de>,
Michal Nazarewicz <mina86@...a86.com>,
Grant Likely <grant.likely@...aro.org>,
Laura Abbott <lauraa@...eaurora.org>,
Josh Cartwright <joshc@...eaurora.org>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH] base: dma-coherent: fix device_init initialization
On Wed, 15 Oct 2014 15:32:20 -0500 Felipe Balbi <balbi@...com> wrote:
> commit 7bfa5ab (drivers: dma-coherent: add initialization
> from device tree) added support for dma coherent pool for
> DeviceTree. Unfortunately that commit introduced a new
> build warning because of a wrong type on the definition
> of ->device_init(). This patch fixes it.
Guys, when fixing a warning please always always always quote that
warning in the changelog.
Presumably your patch addresses the same mystery warning as did Marek's.
From: Marek Szyprowski <m.szyprowski@...sung.com>
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 7bfa5ab6fa1b ("drivers:
dma-coherent: add initialization from device tree"), which has been merged
without this change and without fixing function return value.
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Michal Nazarewicz <mina86@...a86.com>
Cc: Grant Likely <grant.likely@...aro.org>
Cc: Laura Abbott <lauraa@...eaurora.org>
Cc: Josh Cartwright <joshc@...eaurora.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Kyungmin Park <kyungmin.park@...sung.com>
Cc: Russell King <rmk+kernel@....linux.org.uk>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
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 -puN drivers/base/dma-contiguous.c~drivers-of-add-return-value-to-of_reserved_mem_device_init drivers/base/dma-contiguous.c
--- a/drivers/base/dma-contiguous.c~drivers-of-add-return-value-to-of_reserved_mem_device_init
+++ a/drivers/base/dma-contiguous.c
@@ -223,9 +223,10 @@ bool dma_release_from_contiguous(struct
#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 -puN drivers/of/of_reserved_mem.c~drivers-of-add-return-value-to-of_reserved_mem_device_init drivers/of/of_reserved_mem.c
--- a/drivers/of/of_reserved_mem.c~drivers-of-add-return-value-to-of_reserved_mem_device_init
+++ a/drivers/of/of_reserved_mem.c
@@ -243,23 +243,27 @@ static inline struct reserved_mem *__fin
* 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;
- rmem->ops->device_init(rmem, dev);
- dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
+ ret = rmem->ops->device_init(rmem, dev);
+ if (ret == 0)
+ dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
+
+ return ret;
}
/**
diff -puN include/linux/of_reserved_mem.h~drivers-of-add-return-value-to-of_reserved_mem_device_init include/linux/of_reserved_mem.h
--- a/include/linux/of_reserved_mem.h~drivers-of-add-return-value-to-of_reserved_mem_device_init
+++ a/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)(st
_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) { }
_
--
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