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-rw-r--r--net/core/dev.c35
1 files changed, 31 insertions, 4 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index e63bf61b19be..8637b2b71f3d 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1698,27 +1698,54 @@ EXPORT_SYMBOL_GPL(net_dec_egress_queue);
static struct static_key netstamp_needed __read_mostly;
#ifdef HAVE_JUMP_LABEL
static atomic_t netstamp_needed_deferred;
+static atomic_t netstamp_wanted;
static void netstamp_clear(struct work_struct *work)
{
int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
+ int wanted;
- while (deferred--)
- static_key_slow_dec(&netstamp_needed);
+ wanted = atomic_add_return(deferred, &netstamp_wanted);
+ if (wanted > 0)
+ static_key_enable(&netstamp_needed);
+ else
+ static_key_disable(&netstamp_needed);
}
static DECLARE_WORK(netstamp_work, netstamp_clear);
#endif
void net_enable_timestamp(void)
{
+#ifdef HAVE_JUMP_LABEL
+ int wanted;
+
+ while (1) {
+ wanted = atomic_read(&netstamp_wanted);
+ if (wanted <= 0)
+ break;
+ if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted + 1) == wanted)
+ return;
+ }
+ atomic_inc(&netstamp_needed_deferred);
+ schedule_work(&netstamp_work);
+#else
static_key_slow_inc(&netstamp_needed);
+#endif
}
EXPORT_SYMBOL(net_enable_timestamp);
void net_disable_timestamp(void)
{
#ifdef HAVE_JUMP_LABEL
- /* net_disable_timestamp() can be called from non process context */
- atomic_inc(&netstamp_needed_deferred);
+ int wanted;
+
+ while (1) {
+ wanted = atomic_read(&netstamp_wanted);
+ if (wanted <= 1)
+ break;
+ if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted - 1) == wanted)
+ return;
+ }
+ atomic_dec(&netstamp_needed_deferred);
schedule_work(&netstamp_work);
#else
static_key_slow_dec(&netstamp_needed);