From 8c6f0fc4d2d505b17fc67675f0797fe3fc6e6c26 Mon Sep 17 00:00:00 2001 From: "Cooper Jr., Franklin" Date: Fri, 15 Apr 2016 15:28:59 -0500 Subject: [PATCH] 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 Signed-off-by: Boris Brezillon --- drivers/mtd/nand/omap2.c | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c index d1496b1276df..08e158895635 100644 --- a/drivers/mtd/nand/omap2.c +++ b/drivers/mtd/nand/omap2.c @@ -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); -- 2.20.1