patches/net-3com-3c59x-Pull-locking-out-of-ISR.patch

From: Anna-Maria Gleixner <anna-maria@linutronix.de>
Date: Thu, 12 Apr 2018 18:36:15 +0200
Subject: [PATCH] net: 3com: 3c59x: Pull locking out of ISR

Locking is done in the same way in _vortex_interrupt() and
_boomerang_interrupt(). To prevent duplication, move the locking into the
calling vortex_boomerang_interrupt() function.

No functional change.

Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/net/ethernet/3com/3c59x.c |   20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

--- a/drivers/net/ethernet/3com/3c59x.c
+++ b/drivers/net/ethernet/3com/3c59x.c
@@ -2272,7 +2272,6 @@ static irqreturn_t
 	unsigned int bytes_compl = 0, pkts_compl = 0;
 
 	ioaddr = vp->ioaddr;
-	spin_lock(&vp->lock);
 
 	status = ioread16(ioaddr + EL3_STATUS);
 
@@ -2370,7 +2369,6 @@ static irqreturn_t
 		pr_debug("%s: exiting interrupt, status %4.4x.\n",
 			   dev->name, status);
 handler_exit:
-	spin_unlock(&vp->lock);
 	return IRQ_RETVAL(handled);
 }
 
@@ -2391,12 +2389,6 @@ static irqreturn_t
 
 	ioaddr = vp->ioaddr;
 
-
-	/*
-	 * It seems dopey to put the spinlock this early, but we could race against vortex_tx_timeout
-	 * and boomerang_start_xmit
-	 */
-	spin_lock(&vp->lock);
 	vp->handling_irq = 1;
 
 	status = ioread16(ioaddr + EL3_STATUS);
@@ -2515,7 +2507,6 @@ static irqreturn_t
 			   dev->name, status);
 handler_exit:
 	vp->handling_irq = 0;
-	spin_unlock(&vp->lock);
 	return IRQ_RETVAL(handled);
 }
 
@@ -2524,11 +2515,18 @@ vortex_boomerang_interrupt(int irq, void
 {
 	struct net_device *dev = dev_id;
 	struct vortex_private *vp = netdev_priv(dev);
+	irqreturn_t ret;
+
+	spin_lock(&vp->lock);
 
 	if (vp->full_bus_master_rx)
-		return _boomerang_interrupt(dev->irq, dev);
+		ret = _boomerang_interrupt(dev->irq, dev);
 	else
-		return _vortex_interrupt(dev->irq, dev);
+		ret = _vortex_interrupt(dev->irq, dev);
+
+	spin_unlock(&vp->lock);
+
+	return ret;
 }
 
 static int vortex_rx(struct net_device *dev)