drivers-net-vortex-fix-locking-issues.patch

From 3ef17657c212b7d7e6ea7fb4873fa78df90c5539 Mon Sep 17 00:00:00 2001
From: Steven Rostedt <rostedt@goodmis.org>
Date: Fri, 3 Jul 2009 08:30:00 -0500
Subject: [PATCH] drivers/net: vortex fix locking issues

commit 99c5059eca9de458b1ccd5e1e929d6f27ea56d12 in tip.

Argh, cut and paste wasn't enough...

Use this patch instead.  It needs an irq disable.  But, believe it or not,
on SMP this is actually better.  If the irq is shared (as it is in Mark's
case), we don't stop the irq of other devices from being handled on
another CPU (unfortunately for Mark, he pinned all interrupts to one CPU).

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 drivers/net/3c59x.c |   16 +++++++---------
 1 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
index 5f92fdb..de4602f 100644
--- a/drivers/net/3c59x.c
+++ b/drivers/net/3c59x.c
@@ -797,9 +797,9 @@ static void poll_vortex(struct net_device *dev)
 {
 	struct vortex_private *vp = netdev_priv(dev);
 	unsigned long flags;
-	local_irq_save(flags);
+	local_irq_save_nort(flags);
 	(vp->full_bus_master_rx ? boomerang_interrupt:vortex_interrupt)(dev->irq,dev);
-	local_irq_restore(flags);
+	local_irq_restore_nort(flags);
 }
 #endif
 
@@ -1764,6 +1764,7 @@ vortex_timer(unsigned long data)
 	int next_tick = 60*HZ;
 	int ok = 0;
 	int media_status, old_window;
+	unsigned long flags;
 
 	if (vortex_debug > 2) {
 		pr_debug("%s: Media selection timer tick happened, %s.\n",
@@ -1771,7 +1772,7 @@ vortex_timer(unsigned long data)
 		pr_debug("dev->watchdog_timeo=%d\n", dev->watchdog_timeo);
 	}
 
-	disable_irq_lockdep(dev->irq);
+	spin_lock_irqsave(&vp->lock, flags);
 	old_window = ioread16(ioaddr + EL3_CMD) >> 13;
 	EL3WINDOW(4);
 	media_status = ioread16(ioaddr + Wn4_Media);
@@ -1794,10 +1795,7 @@ vortex_timer(unsigned long data)
 	case XCVR_MII: case XCVR_NWAY:
 		{
 			ok = 1;
-			/* Interrupts are already disabled */
-			spin_lock(&vp->lock);
 			vortex_check_media(dev, 0);
-			spin_unlock(&vp->lock);
 		}
 		break;
 	  default:					/* Other media types handled by Tx timeouts. */
@@ -1851,7 +1849,7 @@ leave_media_alone:
 			 dev->name, media_tbl[dev->if_port].name);
 
 	EL3WINDOW(old_window);
-	enable_irq_lockdep(dev->irq);
+	spin_unlock_irqrestore(&vp->lock, flags);
 	mod_timer(&vp->timer, RUN_AT(next_tick));
 	if (vp->deferred)
 		iowrite16(FakeIntr, ioaddr + EL3_CMD);
@@ -1885,12 +1883,12 @@ static void vortex_tx_timeout(struct net_device *dev)
 			 * Block interrupts because vortex_interrupt does a bare spin_lock()
 			 */
 			unsigned long flags;
-			local_irq_save(flags);
+			local_irq_save_nort(flags);
 			if (vp->full_bus_master_tx)
 				boomerang_interrupt(dev->irq, dev);
 			else
 				vortex_interrupt(dev->irq, dev);
-			local_irq_restore(flags);
+			local_irq_restore_nort(flags);
 		}
 	}
 
-- 
1.7.0.4