dpaa_eth: use fd information in dpaa_cleanup_tx_fd()

Instead of reading skb fields, use information from the DPAA frame
descriptor.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index f0b5da5..a278651 100644 (file)
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -1588,13 +1588,10 @@ static struct sk_buff *dpaa_cleanup_tx_fd(const struct dpaa_priv *priv,
        void *vaddr = phys_to_virt(addr);
        const struct qm_sg_entry *sgt;
        struct sk_buff *skb;
-       int nr_frags, i;
        u64 ns;
-
-       skb = *(struct sk_buff **)vaddr;
+       int i;
 
        if (unlikely(qm_fd_get_format(fd) == qm_fd_sg)) {
-               nr_frags = skb_shinfo(skb)->nr_frags;
                dma_unmap_single(priv->tx_dma_dev, addr,
                                 qm_fd_get_offset(fd) + DPAA_SGT_SIZE,
                                 dma_dir);
@@ -1609,7 +1606,8 @@ static struct sk_buff *dpaa_cleanup_tx_fd(const struct dpaa_priv *priv,
                                 qm_sg_entry_get_len(&sgt[0]), dma_dir);
 
                /* remaining pages were mapped with skb_frag_dma_map() */
-               for (i = 1; i <= nr_frags; i++) {
+               for (i = 1; (i < DPAA_SGT_MAX_ENTRIES) &&
+                    !qm_sg_entry_is_final(&sgt[i - 1]); i++) {
                        WARN_ON(qm_sg_entry_is_ext(&sgt[i]));
 
                        dma_unmap_page(priv->tx_dma_dev, qm_sg_addr(&sgt[i]),
@@ -1617,9 +1615,12 @@ static struct sk_buff *dpaa_cleanup_tx_fd(const struct dpaa_priv *priv,
                }
        } else {
                dma_unmap_single(priv->tx_dma_dev, addr,
-                                skb_tail_pointer(skb) - (u8 *)vaddr, dma_dir);
+                                priv->tx_headroom + qm_fd_get_length(fd),
+                                dma_dir);
        }
 
+       skb = *(struct sk_buff **)vaddr;
+
        /* DMA unmapping is required before accessing the HW provided info */
        if (ts && priv->tx_tstamp &&
            skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {