linux-kernel - [PATCH] Fix a lock problem in generic phy code

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Message-Id: <200708311430.09590.hjk@linutronix.de>
Date:	Fri, 31 Aug 2007 14:30:08 +0200
From:	Hans-Jürgen Koch <hjk@...utronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	netdev@...r.kernel.org, Jeff Garzik <jeff@...zik.org>,
	afleming@...escale.com
Subject: [PATCH] Fix a lock problem in generic phy code

Lock debugging finds a problem in phy.c and phy_device.c,
this patch fixes it. Tested on an AT91SAM9263-EK board, 
kernel 2.6.23-rc4.

Signed-off-by: Hans J. Koch <hjk@...utronix.de>
---

Index: linux-2.6.23-rc/drivers/net/phy/phy_device.c
===================================================================
--- linux-2.6.23-rc.orig/drivers/net/phy/phy_device.c	2007-08-31 
14:07:47.000000000 +0200
+++ linux-2.6.23-rc/drivers/net/phy/phy_device.c	2007-08-31 14:08:22.000000000 
+0200
@@ -644,7 +644,7 @@
 	if (!(phydrv->flags & PHY_HAS_INTERRUPT))
 		phydev->irq = PHY_POLL;
 
-	spin_lock(&phydev->lock);
+	spin_lock_bh(&phydev->lock);
 
 	/* Start out supporting everything. Eventually,
 	 * a controller will attach, and may modify one
@@ -658,7 +658,7 @@
 	if (phydev->drv->probe)
 		err = phydev->drv->probe(phydev);
 
-	spin_unlock(&phydev->lock);
+	spin_unlock_bh(&phydev->lock);
 
 	return err;
 
Index: linux-2.6.23-rc/drivers/net/phy/phy.c
===================================================================
--- linux-2.6.23-rc.orig/drivers/net/phy/phy.c	2007-08-31 14:15:20.000000000 
+0200
+++ linux-2.6.23-rc/drivers/net/phy/phy.c	2007-08-31 14:15:43.000000000 +0200
@@ -755,7 +755,7 @@
  */
 void phy_start(struct phy_device *phydev)
 {
-	spin_lock(&phydev->lock);
+	spin_lock_bh(&phydev->lock);
 
 	switch (phydev->state) {
 		case PHY_STARTING:
@@ -769,7 +769,7 @@
 		default:
 			break;
 	}
-	spin_unlock(&phydev->lock);
+	spin_unlock_bh(&phydev->lock);
 }
 EXPORT_SYMBOL(phy_stop);
 EXPORT_SYMBOL(phy_start);
-
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