From 082086f2ce53c69260396e977d29972128def1d7 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Wed, 22 Dec 2010 23:13:37 +0100 Subject: [PATCH] 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 Signed-off-by: Linus Walleij Signed-off-by: Grant Likely --- drivers/spi/amba-pl022.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/spi/amba-pl022.c b/drivers/spi/amba-pl022.c index e29751a..36ec132 100644 --- a/drivers/spi/amba-pl022.c +++ b/drivers/spi/amba-pl022.c @@ -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) -- 2.7.4