KS8695: fix ks8695_rx_irq() bug.

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: zeal <zealcook@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 15 deletions

diff --git a/drivers/net/arm/ks8695net.c b/drivers/net/arm/ks8695net.c
index 0073d198715..e15451a8510 100644
--- a/drivers/net/arm/ks8695net.c
+++ b/drivers/net/arm/ks8695net.c
@@ -433,24 +433,16 @@ 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 = readl(KS8695_IRQ_VA + KS8695_INTEN);
+                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);