netdev - [PATCH 2/5] bonding: Don't destroy bonding master when removing slave via sysfs

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Message-Id: <1215048125108-git-send-email-fubar@us.ibm.com>
Date:	Wed,  2 Jul 2008 18:21:59 -0700
From:	Jay Vosburgh <fubar@...ibm.com>
To:	netdev@...r.kernel.org
Cc:	Jeff Garzik <jgarzik@...ox.com>,
	David Miller <davem@...emloft.net>,
	Moni Shoua <monis@...taire.com>,
	Jay Vosburgh <fubar@...ibm.com>
Subject: [PATCH 2/5] bonding: Don't destroy bonding master when removing slave via sysfs

From: Moni Shoua <monis@...taire.com>

It is wrong to destroy a bonding master from a context that uses the sysfs
of that bond. When last IPoIB slave is unenslaved from by writing to a
sysfs file (for bond0 this would be /sys/class/net/bond0/bonding/slaves)
the driver tries to destroy the bond. This is wrong and can lead to a
lockup or a crash.  This fix lets the bonding master stay and relies on
the user to destroy the bonding master if necessary (i.e. before module
ib_ipoib is unloaded)

This patch affects only bonds of IPoIB slaves. Ethernet slaves stay
unaffected.

Signed-off-by: Moni Shoua <monis@...taire.com>
Signed-off-by: Jay Vosburgh <fubar@...ibm.com>
---
 drivers/net/bonding/bond_sysfs.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 6caac0f..3bdb473 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -350,9 +350,6 @@ static ssize_t bonding_store_slaves(struct device *d,
 		if (dev) {
 			printk(KERN_INFO DRV_NAME ": %s: Removing slave %s\n",
 				bond->dev->name, dev->name);
-			if (bond->setup_by_slave)
-				res = bond_release_and_destroy(bond->dev, dev);
-			else
 				res = bond_release(bond->dev, dev);
 			if (res) {
 				ret = res;
-- 
1.5.2.4

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