netdev - [PATCH v2 1/2] net: sh_eth: Fix receive packet "exceeded" condition in sh_eth

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Message-ID: <539653EE.1000700@renesas.com>
Date:	Tue, 10 Jun 2014 09:40:14 +0900
From:	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	SH-Linux <linux-sh@...r.kernel.org>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: [PATCH v2 1/2] net: sh_eth: Fix receive packet "exceeded" condition
 in sh_eth_rx()

This patch fixes the packet "exceeded" condition in sh_eth_rx() when
RACT in an RX descriptor is not set and the "quota" is 0.
Otherwise, kernel panic happens because the "&n->poll_list" is deleted
twice in sh_eth_poll() which calls napi_complete() and net_rx_action().

Signed-off-by: Kouei Abe <kouei.abe.cp@...esas.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
---
 drivers/net/ethernet/renesas/sh_eth.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 08ed9a3..5761f8c 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1399,7 +1399,6 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota)
 	int entry = mdp->cur_rx % mdp->num_rx_ring;
 	int boguscnt = (mdp->dirty_rx + mdp->num_rx_ring) - mdp->cur_rx;
 	struct sk_buff *skb;
-	int exceeded = 0;
 	u16 pkt_len = 0;
 	u32 desc_status;

@@ -1411,10 +1410,9 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota)
 		if (--boguscnt < 0)
 			break;

-		if (*quota <= 0) {
-			exceeded = 1;
+		if (*quota <= 0)
 			break;
-		}
+
 		(*quota)--;

 		if (!(desc_status & RDFEND))
@@ -1508,7 +1506,7 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota)
 		sh_eth_write(ndev, EDRRR_R, EDRRR);
 	}

-	return exceeded;
+	return *quota <= 0;
 }

 static void sh_eth_rcv_snd_disable(struct net_device *ndev)
-- 
1.7.9.5

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