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

[ Upstream commit a93ad94 ] 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: b9b17de ("net: emac: emac gigabit ethernet controller driver") Cc: [email protected] Signed-off-by: Timur Tabi <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
libos-nuse · Oct 12, 2017 · 852bdea · 852bdea
1 parent 5600c75
commit 852bdea
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/drivers/net/ethernet/qualcomm/emac/emac-mac.c b/drivers/net/ethernet/qualcomm/emac/emac-mac.c
@@ -932,7 +932,8 @@ 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) {