linux-kernel - [PATCH v2 9/9] dpaa_eth: fix SG frame cleanup

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Date:   Sat, 27 Apr 2019 10:10:31 +0300
From:   laurentiu.tudor@....com
To:     netdev@...r.kernel.org, madalin.bucur@....com, roy.pledge@....com,
        camelia.groza@....com, leoyang.li@....com
Cc:     davem@...emloft.net, iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Laurentiu Tudor <laurentiu.tudor@....com>
Subject: [PATCH v2 9/9] dpaa_eth: fix SG frame cleanup

From: Laurentiu Tudor <laurentiu.tudor@....com>

Fix issue with the entry indexing in the sg frame cleanup code being
off-by-1. This problem showed up when doing some basic iperf tests and
manifested in traffic coming to a halt.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
Acked-by: Madalin Bucur <madalin.bucur@....com>
---
 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index daede7272768..40420edc9ce6 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -1663,7 +1663,7 @@ 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 <= nr_frags; i++) {
 			WARN_ON(qm_sg_entry_is_ext(&sgt[i]));
 
 			dma_unmap_page(dev, qm_sg_addr(&sgt[i]),
-- 
2.17.1