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drivers: dma-coherent: simplify dma_init_coherent_memory return value 

Since only dma_declare_coherent_memory cares about
dma_init_coherent_memory returning part of flags as it return value,
move the condition to the former and simplify the latter.  This in
turn makes rmem_dma_device_init less confusing.

Reported-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michal Nazarewicz 2016-01-04 22:36:40 +01:00 committed by Greg Kroah-Hartman
parent 92aed5d6ba
commit 9e5b3d6f7f
1 changed files with 11 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/base/dma-coherent.c
View File

@ -17,9 +17,9 @@ struct dma_coherent_mem {
spinlock_t spinlock;
};
static int dma_init_coherent_memory(phys_addr_t phys_addr, dma_addr_t device_addr,
size_t size, int flags,
struct dma_coherent_mem **mem)
static bool dma_init_coherent_memory(
phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags,
struct dma_coherent_mem **mem)
{
struct dma_coherent_mem *dma_mem = NULL;
void __iomem *mem_base = NULL;
@ -50,17 +50,13 @@ static int dma_init_coherent_memory(phys_addr_t phys_addr, dma_addr_t device_add
spin_lock_init(&dma_mem->spinlock);
*mem = dma_mem;
if (flags & DMA_MEMORY_MAP)
return DMA_MEMORY_MAP;
return DMA_MEMORY_IO;
return true;
out:
kfree(dma_mem);
if (mem_base)
iounmap(mem_base);
return 0;
return false;
}
static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
@ -88,15 +84,13 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
dma_addr_t device_addr, size_t size, int flags)
{
struct dma_coherent_mem *mem;
int ret;
ret = dma_init_coherent_memory(phys_addr, device_addr, size, flags,
&mem);
if (ret == 0)
if (!dma_init_coherent_memory(phys_addr, device_addr, size, flags,
&mem))
return 0;
if (dma_assign_coherent_memory(dev, mem) == 0)
return ret;
return flags & DMA_MEMORY_MAP ? DMA_MEMORY_MAP : DMA_MEMORY_IO;
dma_release_coherent_memory(mem);
return 0;
@ -281,9 +275,9 @@ static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev)
struct dma_coherent_mem *mem = rmem->priv;
if (!mem &&
dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE,
&mem) != DMA_MEMORY_MAP) {
!dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE,
&mem)) {
pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %ld MiB\n",
&rmem->base, (unsigned long)rmem->size / SZ_1M);
return -ENODEV;