8139cp: set intr mask after its handler is registered

We set intr mask before its handler is registered, this does not work well when
8139cp is sharing irq line with other devices. As the irq could be enabled by
the device before 8139cp's hander is registered which may lead unhandled
irq. Fix this by introducing an helper cp_irq_enable() and call it after
request_irq().

(cherry picked from commit a8c9cb106fe79c28d6b7f1397652cadd228715ff)
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Joe Jin <joe.jin@oracle.com>

diff --git a/drivers/net/8139cp.c b/drivers/net/8139cp.c
index 29989d20cf948c4960f2914a83c579fe81b541fb..1ff9199c6ba34f698fcbfe4757c6364213307880 100644 (file)
--- a/drivers/net/8139cp.c
+++ b/drivers/net/8139cp.c
@@ -989,6 +989,11 @@ static inline void cp_start_hw (struct cp_private *cp)
        cpw8(Cmd, RxOn | TxOn);
 }
 
+static void cp_enable_irq(struct cp_private *cp)
+{
+       cpw16_f(IntrMask, cp_intr_mask);
+}
+
 static void cp_init_hw (struct cp_private *cp)
 {
        struct net_device *dev = cp->dev;
@@ -1028,8 +1033,6 @@ static void cp_init_hw (struct cp_private *cp)
 
        cpw16(MultiIntr, 0);
 
-       cpw16_f(IntrMask, cp_intr_mask);
-
        cpw8_f(Cfg9346, Cfg9346_Lock);
 }
 
@@ -1161,6 +1164,8 @@ static int cp_open (struct net_device *dev)
        if (rc)
                goto err_out_hw;
 
+       cp_enable_irq(cp);
+
        netif_carrier_off(dev);
        mii_check_media(&cp->mii_if, netif_msg_link(cp), true);
        netif_start_queue(dev);
@@ -2059,6 +2064,7 @@ static int cp_resume (struct pci_dev *pdev)
        /* FIXME: sh*t may happen if the Rx ring buffer is depleted */
        cp_init_rings_index (cp);
        cp_init_hw (cp);
+       cp_enable_irq(cp);
        netif_start_queue (dev);
 
        spin_lock_irqsave (&cp->lock, flags);