releases/3.0.30/8139cp-set-intr-mask-after-its-handler-is-registered.patch

From fc1b8cf5e83a53e2edb9d0e43b8ff64fdaf24e60 Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@redhat.com>
Date: Wed, 11 Apr 2012 22:10:54 +0000
Subject: 8139cp: set intr mask after its handler is registered


From: Jason Wang <jasowang@redhat.com>

[ Upstream commit a8c9cb106fe79c28d6b7f1397652cadd228715ff ]

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().

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/8139cp.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/drivers/net/8139cp.c
+++ b/drivers/net/8139cp.c
@@ -992,6 +992,11 @@ static inline void cp_start_hw (struct c
 	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;
@@ -1031,8 +1036,6 @@ static void cp_init_hw (struct cp_privat
 
 	cpw16(MultiIntr, 0);
 
-	cpw16_f(IntrMask, cp_intr_mask);
-
 	cpw8_f(Cfg9346, Cfg9346_Lock);
 }
 
@@ -1164,6 +1167,8 @@ static int cp_open (struct net_device *d
 	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);
@@ -2052,6 +2057,7 @@ static int cp_resume (struct pci_dev *pd
 	/* 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);