netdev - [PATCH] mv643xx: Clear pending interrupts before calling request

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Message-ID: <20070308052123.GA5077@xyzzy.farnsworth.org>
Date:	Wed, 7 Mar 2007 22:21:23 -0700
From:	"Dale Farnsworth" <dale@...nsworth.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	giri@....cs.sunysb.edu, Giridhar Pemmasani <pgiri@...oo.com>
Subject: [PATCH] mv643xx: Clear pending interrupts before calling request_irq

From: Dale Farnsworth <dale@...nsworth.org>

Signed-off-by: Dale Farnsworth <dale@...nsworth.org>
Acked-by: Giridhar Pemmasani <pgiri@...oo.com>

---

Giri, thank you very much for reporting the problem and confirming
the fix.

Jeff, please apply.

Andrew, this patch supersedes the -mm patch:
	mv643xx-ethernet-driver-irq-registration-fix.patch

 drivers/net/mv643xx_eth.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 3e045a6..192b390 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -787,6 +787,12 @@ static int mv643xx_eth_open(struct net_device *dev)
 	unsigned int size;
 	int err;
 
+	/* Clear any pending ethernet port interrupts */
+	mv_write(MV643XX_ETH_INTERRUPT_CAUSE_REG(port_num), 0);
+	mv_write(MV643XX_ETH_INTERRUPT_CAUSE_EXTEND_REG(port_num), 0);
+	/* wait for previous write to complete */
+	mv_read (MV643XX_ETH_INTERRUPT_CAUSE_EXTEND_REG(port_num));
+
 	err = request_irq(dev->irq, mv643xx_eth_int_handler,
 			IRQF_SHARED | IRQF_SAMPLE_RANDOM, dev->name, dev);
 	if (err) {
@@ -875,10 +881,6 @@ static int mv643xx_eth_open(struct net_device *dev)
 
 	mv643xx_eth_rx_refill_descs(dev);	/* Fill RX ring with skb's */
 
-	/* Clear any pending ethernet port interrupts */
-	mv_write(MV643XX_ETH_INTERRUPT_CAUSE_REG(port_num), 0);
-	mv_write(MV643XX_ETH_INTERRUPT_CAUSE_EXTEND_REG(port_num), 0);
-
 	eth_port_start(dev);
 
 	/* Interrupt Coalescing */


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