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net: qcom/emac: specify the correct size when mapping a DMA buffer 

When mapping the RX DMA buffers, the driver was accidentally specifying
zero for the buffer length.  Under normal circumstances, SWIOTLB does not
need to allocate a bounce buffer, so the address is just mapped without
checking the size field.  This is why the error was not detected earlier.

Fixes: b9b17debc6 ("net: emac: emac gigabit ethernet controller driver")
Cc: stable@vger.kernel.org
Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Timur Tabi 2017-09-22 15:32:44 -05:00 committed by David S. Miller
parent 016576d531
commit a93ad944f4
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/qualcomm/emac/emac-mac.c
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@ -898,7 +898,8 @@ static void emac_mac_rx_descs_refill(struct emac_adapter *adpt,
curr_rxbuf->dma_addr =
dma_map_single(adpt->netdev->dev.parent, skb->data,
curr_rxbuf->length, DMA_FROM_DEVICE);
adpt->rxbuf_size, DMA_FROM_DEVICE);
ret = dma_mapping_error(adpt->netdev->dev.parent,
curr_rxbuf->dma_addr);
if (ret) {