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net: net_enable_timestamp() can be called from irq contexts

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am: 3d87dce3df

Change-Id: Ib4161ed12db4e8e0b826c2d9c87f744f4eed9a3a
This commit is contained in:
Eric Dumazet
2017-03-22 11:57:58 +00:00
committed by android-build-merger
parent ca2c57a3f0 3d87dce3df
commit 2fd730d552
1 changed files with 31 additions and 4 deletions
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35
net/core/dev.c
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@@ -1697,27 +1697,54 @@ 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);