| Message ID | 1486979107-15362-1-git-send-email-boris.brezillon@free-electrons.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Am 13.02.2017 um 10:45 schrieb Boris Brezillon: > do_dma() use an integer to pass the DMA data direction information and > pass the same value to dmaengine_prep_slave_sg(). > > Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV} > definitions so it works fine, but assuming this will always be the case > is not safe. > > Enforce enum dma_data_direction type in the function prototype and make > the enum dma_data_direction -> enum dma_transfer_direction conversion > explicit. > > Reported-by: Richard Weinberger <richard@nod.at> > Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> > --- > drivers/mtd/nand/tango_nand.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c > index 4a5e948c62df..9a0e2f85d865 100644 > --- a/drivers/mtd/nand/tango_nand.c > +++ b/drivers/mtd/nand/tango_nand.c > @@ -223,8 +223,8 @@ static void tango_dma_callback(void *arg) > complete(arg); > } > > -static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf, > - int len, int page) > +static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd, > + const void *buf, int len, int page) > { > void __iomem *addr = nfc->reg_base + NFC_STATUS; > struct dma_chan *chan = nfc->chan; > @@ -238,7 +238,10 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf, > if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1) > return -EIO; > > - desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT); > + desc = dmaengine_prep_slave_sg(chan, &sg, 1, > + dir == DMA_FROM_DEVICE ? > + DMA_DEV_TO_MEM : DMA_MEM_TO_DEV, > + DMA_PREP_INTERRUPT); > if (!desc) > goto dma_unmap; > Reviewed-by: Richard Weinberger <richard@nod.at> Thanks, //richard
diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c index 4a5e948c62df..9a0e2f85d865 100644 --- a/drivers/mtd/nand/tango_nand.c +++ b/drivers/mtd/nand/tango_nand.c @@ -223,8 +223,8 @@ static void tango_dma_callback(void *arg) complete(arg); } -static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf, - int len, int page) +static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd, + const void *buf, int len, int page) { void __iomem *addr = nfc->reg_base + NFC_STATUS; struct dma_chan *chan = nfc->chan; @@ -238,7 +238,10 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf, if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1) return -EIO; - desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT); + desc = dmaengine_prep_slave_sg(chan, &sg, 1, + dir == DMA_FROM_DEVICE ? + DMA_DEV_TO_MEM : DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT); if (!desc) goto dma_unmap;
do_dma() use an integer to pass the DMA data direction information and pass the same value to dmaengine_prep_slave_sg(). Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV} definitions so it works fine, but assuming this will always be the case is not safe. Enforce enum dma_data_direction type in the function prototype and make the enum dma_data_direction -> enum dma_transfer_direction conversion explicit. Reported-by: Richard Weinberger <richard@nod.at> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> --- drivers/mtd/nand/tango_nand.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)