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spi/pl022: pass the returned sglen to the DMA engine 

The sglen return by the dma_map_sg() should be passed to the DMA
engine, not the one passed in. If we one day have a DMA mapper
that can coalesce entries, this will bug due to a too large
number of entries being passed in.

Reported-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Linus Walleij 2010-12-22 23:13:37 +01:00 committed by Grant Likely
parent b729889686
commit 082086f2ce
1 changed files with 7 additions and 7 deletions
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14
drivers/spi/amba-pl022.c
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@ -917,7 +917,7 @@ static int configure_dma(struct pl022 *pl022)
};
unsigned int pages;
int ret;
int sglen;
int rx_sglen, tx_sglen;
struct dma_chan *rxchan = pl022->dma_rx_channel;
struct dma_chan *txchan = pl022->dma_tx_channel;
struct dma_async_tx_descriptor *rxdesc;
@ -991,20 +991,20 @@ static int configure_dma(struct pl022 *pl022)
pl022->cur_transfer->len, &pl022->sgt_tx);
/* Map DMA buffers */
sglen = dma_map_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
rx_sglen = dma_map_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
pl022->sgt_rx.nents, DMA_FROM_DEVICE);
if (!sglen)
if (!rx_sglen)
goto err_rx_sgmap;
sglen = dma_map_sg(txchan->device->dev, pl022->sgt_tx.sgl,
tx_sglen = dma_map_sg(txchan->device->dev, pl022->sgt_tx.sgl,
pl022->sgt_tx.nents, DMA_TO_DEVICE);
if (!sglen)
if (!tx_sglen)
goto err_tx_sgmap;
/* Send both scatterlists */
rxdesc = rxchan->device->device_prep_slave_sg(rxchan,
pl022->sgt_rx.sgl,
pl022->sgt_rx.nents,
rx_sglen,
DMA_FROM_DEVICE,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!rxdesc)
@ -1012,7 +1012,7 @@ static int configure_dma(struct pl022 *pl022)
txdesc = txchan->device->device_prep_slave_sg(txchan,
pl022->sgt_tx.sgl,
pl022->sgt_tx.nents,
tx_sglen,
DMA_TO_DEVICE,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!txdesc)