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>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 6ac29a46e23e..484f58750eba 100644
--- 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;