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Commit 8c6f0fc4 authored by Cooper Jr., Franklin's avatar Cooper Jr., Franklin Committed by Boris Brezillon
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mtd: nand: omap2: Fix high memory dma prefetch transfer 



Based on DMA documentation and testing using high memory buffer when doing
dma transfers can lead to various issues including kernel panics.

To workaround this simply use cpu copy.

Signed-off-by: default avatarFranklin S Cooper Jr <fcooper@ti.com>
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
parent 03d3a1df

drivers/mtd/nand/omap2.c

+2 −11
Original line number Diff line number Diff line
@@ -473,17 +473,8 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr, 
	int ret;

	u32 val;



	if (addr >= high_memory) {

		struct page *p1;



		if (((size_t)addr & PAGE_MASK) !=

			((size_t)(addr + len - 1) & PAGE_MASK))

			goto out_copy;

		p1 = vmalloc_to_page(addr);

		if (!p1)

	if (!virt_addr_valid(addr))

		goto out_copy;

		addr = page_address(p1) + ((size_t)addr & ~PAGE_MASK);

	}



	sg_init_one(&sg, addr, len);

	n = dma_map_sg(info->dma->device->dev, &sg, 1, dir);