netdev - [PATCH] bonding: Don't allow mode change via sysfs with slaves present

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Message-Id: <1321375482-8637-1-git-send-email-vfalico@redhat.com>
Date:	Tue, 15 Nov 2011 17:44:42 +0100
From:	Veaceslav Falico <vfalico@...hat.com>
To:	netdev@...r.kernel.org
Cc:	Andy Gospodarek <andy@...yhouse.net>,
	Jay Vosburgh <fubar@...ibm.com>
Subject: [PATCH] bonding: Don't allow mode change via sysfs with slaves present

When changing mode via bonding's sysfs, the slaves are not initialized
correctly. Forbid to change modes with slaves present to ensure that every
slave is initialized correctly via bond_enslave().

Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
---
 drivers/net/bonding/bond_sysfs.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 5a20804..4ef7e2f 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -319,6 +319,13 @@ static ssize_t bonding_store_mode(struct device *d,
 		goto out;
 	}
 
+	if (bond->slave_cnt > 0) {
+		pr_err("unable to update mode of %s because it has slaves.\n",
+			bond->dev->name);
+		ret = -EPERM;
+		goto out;
+	}
+
 	new_value = bond_parse_parm(buf, bond_mode_tbl);
 	if (new_value < 0)  {
 		pr_err("%s: Ignoring invalid mode value %.*s.\n",
-- 
1.7.6.4

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