netdev - [PATCH 7/7] bonding: Don't hold lock when calling rtnl

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Message-Id: <12006159131703-git-send-email-fubar@us.ibm.com>
Date:	Thu, 17 Jan 2008 16:25:03 -0800
From:	Jay Vosburgh <fubar@...ibm.com>
To:	netdev@...r.kernel.org
Cc:	Jeff Garzik <jgarzik@...ox.com>,
	David Miller <davem@...emloft.net>,
	Andy Gospodarek <andy@...yhouse.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jay Vosburgh <fubar@...ibm.com>
Subject: [PATCH 7/7] bonding: Don't hold lock when calling rtnl_unlock

Change bond_mii_monitor to not hold any locks when calling rtnl_unlock,
as rtnl_unlock can sleep (when acquring another mutex in netdev_run_todo).

Bug reported by Makito SHIOKAWA <mshiokawa@...aclelinux.com>, who
included a different patch.

Signed-off-by: Jay Vosburgh <fubar@...ibm.com>
---
 drivers/net/bonding/bond_main.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 2c6da49..49a1982 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2386,7 +2386,9 @@ void bond_mii_monitor(struct work_struct *work)
 		rtnl_lock();
 		read_lock(&bond->lock);
 		__bond_mii_monitor(bond, 1);
-		rtnl_unlock();
+		read_unlock(&bond->lock);
+		rtnl_unlock();	/* might sleep, hold no other locks */
+		read_lock(&bond->lock);
 	}
 
 	delay = ((bond->params.miimon * HZ) / 1000) ? : 1;
-- 
1.5.3.4.206.g58ba4-dirty

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