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mtd: nand: omap2: Fix high memory dma prefetch transfer

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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: Franklin S Cooper Jr <fcooper@ti.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Cooper Jr., Franklin 2016-04-15 15:28:59 -05:00 committed by Boris Brezillon
parent 03d3a1df6d
commit 8c6f0fc4d2
1 changed files with 2 additions and 11 deletions
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13
drivers/mtd/nand/omap2.c
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@ -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)
goto out_copy;
addr = page_address(p1) + ((size_t)addr & ~PAGE_MASK);
}
if (!virt_addr_valid(addr))
goto out_copy;
sg_init_one(&sg, addr, len);
n = dma_map_sg(info->dma->device->dev, &sg, 1, dir);