diff options
| -rw-r--r-- | net/core/drop_monitor.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c index dcb4d2aeb2a8..000ec8b66d1e 100644 --- a/net/core/drop_monitor.c +++ b/net/core/drop_monitor.c @@ -43,7 +43,13 @@ * netlink alerts */ static int trace_state = TRACE_OFF; -static DEFINE_MUTEX(trace_state_mutex); + +/* net_dm_mutex + * + * An overall lock guarding every operation coming from userspace. + * It also guards the global 'hw_stats_list' list. + */ +static DEFINE_MUTEX(net_dm_mutex); struct per_cpu_dm_data { spinlock_t lock; @@ -241,7 +247,7 @@ static int set_all_monitor_traces(int state) struct dm_hw_stat_delta *new_stat = NULL; struct dm_hw_stat_delta *temp; - mutex_lock(&trace_state_mutex); + mutex_lock(&net_dm_mutex); if (state == trace_state) { rc = -EAGAIN; @@ -289,7 +295,7 @@ static int set_all_monitor_traces(int state) rc = -EINPROGRESS; out_unlock: - mutex_unlock(&trace_state_mutex); + mutex_unlock(&net_dm_mutex); return rc; } @@ -330,12 +336,12 @@ static int dropmon_net_event(struct notifier_block *ev_block, new_stat->dev = dev; new_stat->last_rx = jiffies; - mutex_lock(&trace_state_mutex); + mutex_lock(&net_dm_mutex); list_add_rcu(&new_stat->list, &hw_stats_list); - mutex_unlock(&trace_state_mutex); + mutex_unlock(&net_dm_mutex); break; case NETDEV_UNREGISTER: - mutex_lock(&trace_state_mutex); + mutex_lock(&net_dm_mutex); list_for_each_entry_safe(new_stat, tmp, &hw_stats_list, list) { if (new_stat->dev == dev) { new_stat->dev = NULL; @@ -346,7 +352,7 @@ static int dropmon_net_event(struct notifier_block *ev_block, } } } - mutex_unlock(&trace_state_mutex); + mutex_unlock(&net_dm_mutex); break; } out: |