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mtd: nand: fix generating over-boundary ECC data when writing

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When mtk_ecc_encode() is writing the ECC parity data to the OOB
region,because each register is 4 bytes in length,but the len's unit is
in bytes,the operation in the for loop will cross the ECC's boundary.

Signed-off-by: RogerCC Lin <rogercc.lin@mediatek.com>
Fixes: 1d6b1e4649 ("mtd: mediatek: driver for MTK Smart Device")
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
RogerCC Lin 2016-09-19 10:53:25 +08:00 committed by Boris Brezillon
parent 3be7988674
commit 7a35328992
1 changed files with 8 additions and 4 deletions
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12
drivers/mtd/nand/mtk_ecc.c
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@ -366,7 +366,8 @@ int mtk_ecc_encode(struct mtk_ecc *ecc, struct mtk_ecc_config *config,
u8 *data, u32 bytes)
{
dma_addr_t addr;
u32 *p, len, i;
u8 *p;
u32 len, i, val;
int ret = 0;
addr = dma_map_single(ecc->dev, data, bytes, DMA_TO_DEVICE);
@ -392,11 +393,14 @@ int mtk_ecc_encode(struct mtk_ecc *ecc, struct mtk_ecc_config *config,
/* Program ECC bytes to OOB: per sector oob = FDM + ECC + SPARE */
len = (config->strength * ECC_PARITY_BITS + 7) >> 3;
p = (u32 *)(data + bytes);
p = data + bytes;
/* write the parity bytes generated by the ECC back to the OOB region */
for (i = 0; i < len; i++)
p[i] = readl(ecc->regs + ECC_ENCPAR(i));
for (i = 0; i < len; i++) {
if ((i % 4) == 0)
val = readl(ecc->regs + ECC_ENCPAR(i / 4));
p[i] = (val >> ((i % 4) * 8)) & 0xff;
}
timeout:
dma_unmap_single(ecc->dev, addr, bytes, DMA_TO_DEVICE);