diff options
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/net-sysfs.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index d9b33e923b18..a09d507c5b03 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -193,6 +193,10 @@ static ssize_t carrier_show(struct device *dev, struct device_attribute *attr, char *buf) { struct net_device *netdev = to_net_dev(dev); + int ret = -EINVAL; + + if (!rtnl_trylock()) + return restart_syscall(); if (netif_running(netdev)) { /* Synchronize carrier state with link watch, @@ -200,10 +204,11 @@ static ssize_t carrier_show(struct device *dev, */ linkwatch_sync_dev(netdev); - return sysfs_emit(buf, fmt_dec, !!netif_carrier_ok(netdev)); + ret = sysfs_emit(buf, fmt_dec, !!netif_carrier_ok(netdev)); } + rtnl_unlock(); - return -EINVAL; + return ret; } static DEVICE_ATTR_RW(carrier); |