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| author | Boris Brezillon <boris.brezillon@free-electrons.com> | 2017-02-20 14:10:07 +0100 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2017-03-16 10:26:23 +0100 |
| commit | 1932a9646b777c448aec9d992995b0bb0648b11d (patch) | |
| tree | 9919aa4866a4d4d718bae6bb616bbebd036c2a8b /drivers/mtd/nand/tango_nand.c | |
| parent | 215157fb5338129b4b9f2dca23826084e71bcf4d (diff) | |
| download | talos-obmc-linux-1932a9646b777c448aec9d992995b0bb0648b11d.tar.gz talos-obmc-linux-1932a9646b777c448aec9d992995b0bb0648b11d.zip | |
mtd: nand: tango: Enforce DMA direction type
do_dma() uses an int 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>
Acked-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Diffstat (limited to 'drivers/mtd/nand/tango_nand.c')
| -rw-r--r-- | drivers/mtd/nand/tango_nand.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c index 4a5e948c62df..05b6e1065203 100644 --- a/drivers/mtd/nand/tango_nand.c +++ b/drivers/mtd/nand/tango_nand.c @@ -223,12 +223,13 @@ 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; struct dma_async_tx_descriptor *desc; + enum dma_transfer_direction tdir; struct scatterlist sg; struct completion tx_done; int err = -EIO; @@ -238,7 +239,8 @@ 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); + tdir = dir == DMA_TO_DEVICE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; + desc = dmaengine_prep_slave_sg(chan, &sg, 1, tdir, DMA_PREP_INTERRUPT); if (!desc) goto dma_unmap; |
