netdev - [PATCH 1/2] KS8695: fix ks8695_rx

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Message-Id: <1258381819-10324-1-git-send-email-jie.zeng@soliton.com.cn>
Date:	Mon, 16 Nov 2009 22:30:18 +0800
From:	zealcook@...il.com
To:	netdev@...r.kernel.org
Cc:	ben@...tec.co.uk, davem@...emloft.net,
	"jie.zeng" <jie.zeng@...iton.com.cn>
Subject: [PATCH 1/2] KS8695: fix ks8695_rx_irq() bug.

From: jie.zeng <jie.zeng@...iton.com.cn>

ks8695 rx irq is edge-level. Before arriving at irq handler, the
corresponding status bit has been clear(irq's ack).
So we should not check it after that.

Signed-off-by: jie.zeng <jie.zeng@...iton.com.cn>
---
 drivers/net/arm/ks8695net.c |   20 +++++++-------------
 1 files changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/net/arm/ks8695net.c b/drivers/net/arm/ks8695net.c
index 0073d19..64c683d 100644
--- a/drivers/net/arm/ks8695net.c
+++ b/drivers/net/arm/ks8695net.c
@@ -433,24 +433,18 @@ ks8695_rx_irq(int irq, void *dev_id)
 {
 	struct net_device *ndev = (struct net_device *)dev_id;
 	struct ks8695_priv *ksp = netdev_priv(ndev);
-	unsigned long status;
-
-	unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp);
 
 	spin_lock(&ksp->rx_lock);
 
 	status = readl(KS8695_IRQ_VA + KS8695_INTST);
 
-	/*clean rx status bit*/
-	writel(status | mask_bit , KS8695_IRQ_VA + KS8695_INTST);
-
-	if (status & mask_bit) {
-		if (napi_schedule_prep(&ksp->napi)) {
-			/*disable rx interrupt*/
-			status &= ~mask_bit;
-			writel(status , KS8695_IRQ_VA + KS8695_INTEN);
-			__napi_schedule(&ksp->napi);
-		}
+	if (napi_schedule_prep(&ksp->napi)) {
+		unsigned long status;
+		unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp);
+		/*disable rx interrupt*/
+		status &= ~mask_bit;
+		writel(status , KS8695_IRQ_VA + KS8695_INTEN);
+		__napi_schedule(&ksp->napi);
 	}
 
 	spin_unlock(&ksp->rx_lock);
-- 
1.4.4.4

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