Commit da9fdc8b authored by Magnus Damm's avatar Magnus Damm Committed by Paul Mundt
Browse files

sh: split coherent pages 



Split pages returned by dma_alloc_coherent() and make sure
we free them one by one.

Signed-off-by: default avatarMagnus Damm <damm@igel.co.jp>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 78fb4026

arch/sh/mm/consistent.c

+6 −1
Original line number Diff line number Diff line
@@ -42,6 +42,8 @@ void *dma_alloc_coherent(struct device *dev, size_t size, 
		return NULL;

	}



	split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);



	*dma_handle = virt_to_phys(ret);

	return ret_nocache;

}
@@ -51,10 +53,13 @@ void dma_free_coherent(struct device *dev, size_t size, 
			 void *vaddr, dma_addr_t dma_handle)

{

	int order = get_order(size);

	unsigned long pfn = dma_handle >> PAGE_SHIFT;

	int k;



	if (!dma_release_from_coherent(dev, order, vaddr)) {

		WARN_ON(irqs_disabled());	/* for portability */

		free_pages((unsigned long)phys_to_virt(dma_handle), order);

		for (k = 0; k < (1 << order); k++)

			__free_pages(pfn_to_page(pfn + k), 0);

		iounmap(vaddr);

	}

}