linux-kernel - [PATCH net 02/11] net: thunderx: Fix memory leak while tearing down interface

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Message-ID: <1438177787-20940-3-git-send-email-aleksey.makarov@caviumnetworks.com>
Date:	Wed, 29 Jul 2015 16:49:37 +0300
From:	Aleksey Makarov <aleksey.makarov@...iumnetworks.com>
To:	<netdev@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	David Daney <david.daney@...ium.com>,
	Robert Richter <robert.richter@...iumnetworks.com>,
	Aleksey Makarov <aleksey.makarov@...iumnetworks.com>,
	Sunil Goutham <Sunil.Goutham@...iumnetworks.com>,
	Sunil Goutham <sgoutham@...ium.com>,
	Robert Richter <rric@...nel.org>
Subject: [PATCH net 02/11] net: thunderx: Fix memory leak while tearing down interface

From: Sunil Goutham <sgoutham@...ium.com>

Fixed 'tso_hdrs' memory not being freed properly.
Also fixed SQ skbuff maintenance issues.

Signed-off-by: Sunil Goutham <sgoutham@...ium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@...iumnetworks.com>
---
 drivers/net/ethernet/cavium/thunder/nicvf_main.c   | 1 +
 drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 8 +++++---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
index 8b119a0..2890cd6 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
@@ -425,6 +425,7 @@ static void nicvf_snd_pkt_handler(struct net_device *netdev,
 	if (skb) {
 		prefetch(skb);
 		dev_consume_skb_any(skb);
+		sq->skbuff[cqe_tx->sqe_ptr] = (u64)NULL;
 	}
 }
 
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
index 4dae6aa..4c91959 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
@@ -382,7 +382,8 @@ static void nicvf_free_snd_queue(struct nicvf *nic, struct snd_queue *sq)
 		return;
 
 	if (sq->tso_hdrs)
-		dma_free_coherent(&nic->pdev->dev, sq->dmem.q_len,
+		dma_free_coherent(&nic->pdev->dev,
+				  sq->dmem.q_len * TSO_HEADER_SIZE,
 				  sq->tso_hdrs, sq->tso_hdrs_phys);
 
 	kfree(sq->skbuff);
@@ -863,10 +864,11 @@ void nicvf_sq_free_used_descs(struct net_device *netdev, struct snd_queue *sq,
 			continue;
 		}
 		skb = (struct sk_buff *)sq->skbuff[sq->head];
+		if (skb)
+			dev_kfree_skb_any(skb);
 		atomic64_add(1, (atomic64_t *)&netdev->stats.tx_packets);
 		atomic64_add(hdr->tot_len,
 			     (atomic64_t *)&netdev->stats.tx_bytes);
-		dev_kfree_skb_any(skb);
 		nicvf_put_sq_desc(sq, hdr->subdesc_cnt + 1);
 	}
 }
@@ -1048,7 +1050,7 @@ static int nicvf_sq_append_tso(struct nicvf *nic, struct snd_queue *sq,
 		}
 		nicvf_sq_add_hdr_subdesc(sq, hdr_qentry,
 					 seg_subdescs - 1, skb, seg_len);
-		sq->skbuff[hdr_qentry] = 0;
+		sq->skbuff[hdr_qentry] = (u64)NULL;
 		qentry = nicvf_get_nxt_sqentry(sq, qentry);
 
 		desc_cnt += seg_subdescs;
-- 
2.4.6

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