From: "Cooper Jr., Franklin" <fcooper@xxxxxx>
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@xxxxxx>
---
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 762e0ed..8d0ae3a 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -467,17 +467,8 @@ 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);
--
2.7.0
--
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