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>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/spi/spi_mpc8xxx.c b/drivers/spi/spi_mpc8xxx.c
index d31b57f7baaf..1dd86b835cd8 100644
--- a/drivers/spi/spi_mpc8xxx.c
+++ b/drivers/spi/spi_mpc8xxx.c
@@ -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);