On Fri, 13 Apr 2007 20:08:28 +0200 (CEST) Guennadi Liakhovetski <[email protected]> wrote:
> Hi
>
> Either I've finally gone blind on this Friday 13th or... Looks like this
> almost 3 year old function has a bug. Patch below compile-tested... in a
> way.
>
> Thanks
> Guennadi
> ---
> Guennadi Liakhovetski
>
> dma_declare_coherent_memory() allocates a bitmap 1 bit per page, it
> calculates the bitmap size based on size of long, but allocates bytes...
>
> Signed-off-by: G. Liakhovetski <[email protected]>
>
> diff --git a/arch/i386/kernel/pci-dma.c b/arch/i386/kernel/pci-dma.c
> index 3ebcea0..3d55226 100644
> --- a/arch/i386/kernel/pci-dma.c
> +++ b/arch/i386/kernel/pci-dma.c
> @@ -77,7 +77,7 @@ int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
> {
> void __iomem *mem_base = NULL;
> int pages = size >> PAGE_SHIFT;
> - int bitmap_size = (pages + 31)/32;
> + int bitmap_size = DIV_ROUND_UP(pages, 8);
>
> if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
> goto out;
Looks that way to me, too.
It also hopes like hell that `size' was a multiple of PAGE_SIZE.
-
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