From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Herring Subject: [PATCH v3 10/11] net: calxedaxgmac: fix rx DMA mapping API size mismatches Date: Fri, 30 Aug 2013 16:49:28 -0500 Message-ID: <1377899369-23252-10-git-send-email-robherring2@gmail.com> References: <1377899369-23252-1-git-send-email-robherring2@gmail.com> Cc: Ben Hutchings , Lennert Buytenhek , Rob Herring To: netdev@vger.kernel.org Return-path: Received: from mail-oa0-f41.google.com ([209.85.219.41]:42881 "EHLO mail-oa0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756830Ab3H3VuI (ORCPT ); Fri, 30 Aug 2013 17:50:08 -0400 Received: by mail-oa0-f41.google.com with SMTP id j17so2339566oag.0 for ; Fri, 30 Aug 2013 14:50:08 -0700 (PDT) In-Reply-To: <1377899369-23252-1-git-send-email-robherring2@gmail.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Rob Herring Fix the mismatch in the DMA mapping and unmapping sizes for receive. The unmap size must be equal to the map size and should not be the actual received frame length. The map size should also be adjusted by the NET_IP_ALIGN size since the h/w buffer size (dma_buf_sz) includes this offset. Also, add a missing dma_mapping_error check in xgmac_rx_refill. Reported-by: Lennert Buytenhek Signed-off-by: Rob Herring --- drivers/net/ethernet/calxeda/xgmac.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c index 04c585c..cd5010b 100644 --- a/drivers/net/ethernet/calxeda/xgmac.c +++ b/drivers/net/ethernet/calxeda/xgmac.c @@ -695,9 +695,14 @@ static void xgmac_rx_refill(struct xgmac_priv *priv) if (unlikely(skb == NULL)) break; - priv->rx_skbuff[entry] = skb; paddr = dma_map_single(priv->device, skb->data, - bufsz, DMA_FROM_DEVICE); + priv->dma_buf_sz - NET_IP_ALIGN, + DMA_FROM_DEVICE); + if (dma_mapping_error(priv->device, paddr)) { + dev_kfree_skb_any(skb); + break; + } + priv->rx_skbuff[entry] = skb; desc_set_buf_addr(p, paddr, priv->dma_buf_sz); } @@ -794,13 +799,14 @@ static void xgmac_free_rx_skbufs(struct xgmac_priv *priv) return; for (i = 0; i < DMA_RX_RING_SZ; i++) { - if (priv->rx_skbuff[i] == NULL) + struct sk_buff *skb = priv->rx_skbuff[i]; + if (skb == NULL) continue; p = priv->dma_rx + i; dma_unmap_single(priv->device, desc_get_buf_addr(p), - priv->dma_buf_sz, DMA_FROM_DEVICE); - dev_kfree_skb_any(priv->rx_skbuff[i]); + priv->dma_buf_sz - NET_IP_ALIGN, DMA_FROM_DEVICE); + dev_kfree_skb_any(skb); priv->rx_skbuff[i] = NULL; } } @@ -1187,7 +1193,7 @@ static int xgmac_rx(struct xgmac_priv *priv, int limit) skb_put(skb, frame_len); dma_unmap_single(priv->device, desc_get_buf_addr(p), - frame_len, DMA_FROM_DEVICE); + priv->dma_buf_sz - NET_IP_ALIGN, DMA_FROM_DEVICE); skb->protocol = eth_type_trans(skb, priv->dev); skb->ip_summed = ip_checksum; -- 1.8.1.2