netdev - [PATCH 3/4] net: 3com: 3c59x: Pull locking out of ISR

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Date:   Fri,  4 May 2018 17:17:48 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>, tglx@...utronix.de,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Steffen Klassert <klassert@...hematik.tu-chemnitz.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 3/4] net: 3com: 3c59x: Pull locking out of ISR

From: Anna-Maria Gleixner <anna-maria@...utronix.de>

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.

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

diff --git a/drivers/net/ethernet/3com/3c59x.c b/drivers/net/ethernet/3com/3c59x.c
index 0cfdb07f3e59..fdafe25da153 100644
--- a/drivers/net/ethernet/3com/3c59x.c
+++ b/drivers/net/ethernet/3com/3c59x.c
@@ -2273,7 +2273,6 @@ _vortex_interrupt(int irq, struct net_device *dev)
 	unsigned int bytes_compl = 0, pkts_compl = 0;
 
 	ioaddr = vp->ioaddr;
-	spin_lock(&vp->lock);
 
 	status = ioread16(ioaddr + EL3_STATUS);
 
@@ -2371,7 +2370,6 @@ _vortex_interrupt(int irq, struct net_device *dev)
 		pr_debug("%s: exiting interrupt, status %4.4x.\n",
 			   dev->name, status);
 handler_exit:
-	spin_unlock(&vp->lock);
 	return IRQ_RETVAL(handled);
 }
 
@@ -2392,12 +2390,6 @@ _boomerang_interrupt(int irq, struct net_device *dev)
 
 	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);
@@ -2516,7 +2508,6 @@ _boomerang_interrupt(int irq, struct net_device *dev)
 			   dev->name, status);
 handler_exit:
 	vp->handling_irq = 0;
-	spin_unlock(&vp->lock);
 	return IRQ_RETVAL(handled);
 }
 
@@ -2525,11 +2516,18 @@ vortex_boomerang_interrupt(int irq, void *dev_id)
 {
 	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)
-- 
2.17.0