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spi/mpc8xxx: fix buffer overrun on large transfers 

It fixes an issue when sending-only or receiving-only more than
PAGE_SIZE bytes.

Signed-off-by: christophe leroy <christophe.leroy@c-s.fr>
Acked-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
christophe leroy 2010-09-16 09:05:25 +02:00 committed by Grant Likely
parent 9c03f1622a
commit 37880c909c
1 changed files with 8 additions and 2 deletions
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10
drivers/spi/spi_mpc8xxx.c
View File

@ -408,11 +408,17 @@ static void mpc8xxx_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi)
xfer_ofs = mspi->xfer_in_progress->len - mspi->count;
out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs);
if (mspi->rx_dma == mspi->dma_dummy_rx)
out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma);
else
out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs);
out_be16(&rx_bd->cbd_datlen, 0);
out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP);
out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs);
if (mspi->tx_dma == mspi->dma_dummy_tx)
out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma);
else
out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs);
out_be16(&tx_bd->cbd_datlen, xfer_len);
out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP |
BD_SC_LAST);