netdev - [PATCH] net/ethernet: cpsw: Bugfix interrupts before enabling napi

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Message-Id: <1381691821-25498-1-git-send-email-mpa@pengutronix.de>
Date:	Sun, 13 Oct 2013 21:17:01 +0200
From:	Markus Pargmann <mpa@...gutronix.de>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Florian Fainelli <florian@...nwrt.org>,
	Mugunthan V N <mugunthanvnm@...com>,
	Peter Korsgaard <peter@...sgaard.com>,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	kernel@...gutronix.de, Markus Pargmann <mpa@...gutronix.de>
Subject: [PATCH] net/ethernet: cpsw: Bugfix interrupts before enabling napi

If interrupts happen before napi_enable was called, the driver will not
work as expected. Network transmissions are impossible in this state.
This bug can be reproduced easily by restarting the network interface in
a loop. After some time any network transmissions on the network
interface will fail.

This patch fixes the bug by enabling napi before enabling the network
interface interrupts.

Signed-off-by: Markus Pargmann <mpa@...gutronix.de>
---
 drivers/net/ethernet/ti/cpsw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 804846e..fccd9d4 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -1169,9 +1169,9 @@ static int cpsw_ndo_open(struct net_device *ndev)
 		}
 	}
 
+	napi_enable(&priv->napi);
 	cpdma_ctlr_start(priv->dma);
 	cpsw_intr_enable(priv);
-	napi_enable(&priv->napi);
 	cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_RX);
 	cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_TX);
 
-- 
1.8.4.rc3

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