| Message ID | 1472560548-30567-2-git-send-email-rogercc.lin@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, 30 Aug 2016 20:35:47 +0800 RogerCC Lin <rogercc.lin@mediatek.com> wrote: > From: RogerCC Lin <rogercc.lin@mediatek.com> > > 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> > --- > 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 25a4fbd..495538e 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 >> 2)); I'm nitpicking, but I'd prefer to have 'i / 4' instead of 'i >> 2' to be consistent with the 'i % 4' operation, and I also find it clearer. If you agree, I can do this change while applying the patch, no need to resend. > + p[i] = (val >> ((i % 4) * 8)) & 0xff; > + } > timeout: > > dma_unmap_single(ecc->dev, addr, bytes, DMA_TO_DEVICE);
On Wed, 2016-08-31 at 10:09 +0200, Boris Brezillon wrote: > On Tue, 30 Aug 2016 20:35:47 +0800 > RogerCC Lin <rogercc.lin@mediatek.com> wrote: > > > From: RogerCC Lin <rogercc.lin@mediatek.com> > > > > 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> > > --- > > 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 25a4fbd..495538e 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 >> 2)); > > I'm nitpicking, but I'd prefer to have 'i / 4' instead of 'i >> 2' to > be consistent with the 'i % 4' operation, and I also find it clearer. > > If you agree, I can do this change while applying the patch, no need to > resend. Of course, please apply the patch with 'i / 4', thank you. > > + p[i] = (val >> ((i % 4) * 8)) & 0xff; > > + } > > timeout: > > > > dma_unmap_single(ecc->dev, addr, bytes, DMA_TO_DEVICE); >
On Wed, 31 Aug 2016 16:19:09 +0800 RogerCC.Lin <rogercc.lin@mediatek.com> wrote: > On Wed, 2016-08-31 at 10:09 +0200, Boris Brezillon wrote: > > On Tue, 30 Aug 2016 20:35:47 +0800 > > RogerCC Lin <rogercc.lin@mediatek.com> wrote: > > > > > From: RogerCC Lin <rogercc.lin@mediatek.com> > > > > > > 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> > > > --- > > > 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 25a4fbd..495538e 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 >> 2)); > > > > I'm nitpicking, but I'd prefer to have 'i / 4' instead of 'i >> 2' to > > be consistent with the 'i % 4' operation, and I also find it clearer. > > > > If you agree, I can do this change while applying the patch, no need to > > resend. > > Of course, please apply the patch with 'i / 4', > thank you. Sorry, but I'd prefer to have this patch in -rc7 or -rc8, and I'm not taking the fixes in my tree (it goes through the MTD tree). Can you resend a version? You can add Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com> > > > > + p[i] = (val >> ((i % 4) * 8)) & 0xff; > > > + } > > > timeout: > > > > > > dma_unmap_single(ecc->dev, addr, bytes, DMA_TO_DEVICE); > > > >
diff --git a/drivers/mtd/nand/mtk_ecc.c b/drivers/mtd/nand/mtk_ecc.c index 25a4fbd..495538e 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 >> 2)); + p[i] = (val >> ((i % 4) * 8)) & 0xff; + } timeout: dma_unmap_single(ecc->dev, addr, bytes, DMA_TO_DEVICE);