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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: 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; int ret;
u32 val; u32 val;
if (addr >= high_memory) { if (!virt_addr_valid(addr))
struct page *p1; goto out_copy;
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);
}
sg_init_one(&sg, addr, len); sg_init_one(&sg, addr, len);
n = dma_map_sg(info->dma->device->dev, &sg, 1, dir); n = dma_map_sg(info->dma->device->dev, &sg, 1, dir);