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| author |   RogerCC Lin <rogercc.lin@mediatek.com> | 2016-09-19 10:53:25 +0800 |
|---|---|---|
| committer |   Boris Brezillon <boris.brezillon@free-electrons.com> | 2016-09-19 11:56:33 +0200 |
| commit | 7a353289925f01cb188ebc6fc4f4a33456b7de44 (patch) | |
| tree | 9299f504fb4797d8c51e2778c0bb10d6e672f516 /drivers/mtd | |
| parent | Linux 4.8-rc7 (diff) | |
| download | linux-dev-7a353289925f01cb188ebc6fc4f4a33456b7de44.tar.xz linux-dev-7a353289925f01cb188ebc6fc4f4a33456b7de44.zip | |
mtd: nand: fix generating over-boundary ECC data when writing
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: 1d6b1e464950 ("mtd: mediatek: driver for MTK Smart Device")
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/mtk_ecc.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/mtd/nand/mtk_ecc.c b/drivers/mtd/nand/mtk_ecc.c index 25a4fbd4d24a..d54f666417e1 100644 --- a/drivers/mtd/nand/mtk_ecc.c +++ b/drivers/mtd/nand/mtk_ecc.c @@ -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); |