From: Madalin Bucur <madalin.bucur@nxp.com>
Date: Thu, 31 Oct 2019 16:37:52 +0200
Subject: dpaa_eth: use fd information in dpaa_cleanup_tx_fd()

Git-commit: 7689d82c4585cf2047801b36f9a78410c8237a25
Patch-mainline: v5.5-rc1
References: bsc#1174550

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>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

--- 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_f
 	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_f
 				 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]),
@@ -1618,9 +1616,12 @@ static struct sk_buff *dpaa_cleanup_tx_f
 
 	} 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) {