ich777/linux_media
1
0
Fork 0
mirror of https://github.com/tbsdtv/linux_media.git synced 2025-07-23 20:51:03 +02:00
Code Issues Packages Projects Releases Wiki Activity

net: make net_get_random_once irq safe

Browse Source 
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>
This commit is contained in:
Hannes Frederic Sowa
2013-10-23 20:05:27 +02:00
committed by David S. Miller
parent 974daef7f8
commit f84be2bd96
2 changed files with 4 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
net/core/utils.c
View File

@@ -370,16 +370,17 @@ bool __net_get_random_once(void *buf, int nbytes, bool *done,
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);