net: Avoid race between network down and sysfs

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
git-mirror · Mar 3, 2009 · 5a5990d · 5a5990d
1 parent 07555c9
commit 5a5990d
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
@@ -77,7 +77,9 @@ static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
 	if (endp == buf)
 		goto err;
 
-	rtnl_lock();
+	if (!rtnl_trylock())
+		return -ERESTARTSYS;
+
 	if (dev_isalive(net)) {
 		if ((ret = (*set)(net, new)) == 0)
 			ret = len;