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SubjectRe: [PATCH] drivers: dma-coherent: simplify dma_init_coherent_memory return value
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Hello,

On 2015-12-04 21:14, Michal Nazarewicz wrote:
> 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>

> ---
> drivers/base/dma-coherent.c | 28 +++++++++++-----------------
> 1 file changed, 11 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c
> index 55b8398..87b8083 100644
> --- a/drivers/base/dma-coherent.c
> +++ b/drivers/base/dma-coherent.c
> @@ -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;

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland



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