On Mon, 2013-10-21 at 14:36 +0100, msal...@redhat.com wrote:
> diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c
> index 1725cd6..fb44b3d 100644
> --- a/arch/arm64/mm/ioremap.c
> +++ b/arch/arm64/mm/ioremap.c
> @@ -79,6 +79,21 @@ void __iounmap(volatile void __iomem *io_addr)
> {
> void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
>
> + /* Nothing to do for normal memory. See ioremap_cache() */
> + if (pfn_valid(__virt_to_phys(addr) >> PAGE_SHIFT))
> + return;
addr here can be some I/O address mapped previously, so __virt_to_phys()
is not valid (you don't actually get the pfn by shifting).
Catalin
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