net: make net_get_random_once irq safe
I initial build non irq safe version of net_get_random_once because I
would liked to have the freedom to defer even the extraction process of
get_random_bytes until the nonblocking pool is fully seeded.
I don't think this is a good idea anymore and thus this patch makes
net_get_random_once irq safe. Now someone using net_get_random_once does
not need to care from where it is called.
Cc: David S. Miller <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/utils.c b/net/core/utils.c
index bf09371..2f737bf 100644
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -370,16 +370,17 @@
struct static_key *done_key)
{
static DEFINE_SPINLOCK(lock);
+ unsigned long flags;
- spin_lock_bh(&lock);
+ spin_lock_irqsave(&lock, flags);
if (*done) {
- spin_unlock_bh(&lock);
+ spin_unlock_irqrestore(&lock, flags);
return false;
}
get_random_bytes(buf, nbytes);
*done = true;
- spin_unlock_bh(&lock);
+ spin_unlock_irqrestore(&lock, flags);
__net_random_once_disable_jump(done_key);