* [PATCH net-next-2.6] net: RCU locking for simple ioctl()
@ 2009-11-02 5:42 Eric Dumazet
2009-11-02 7:57 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Eric Dumazet @ 2009-11-02 5:42 UTC (permalink / raw)
To: David S. Miller; +Cc: Linux Netdev List
All ioctls() implemented by dev_ifsioc_locked() :
SIOCGIFFLAGS, SIOCGIFMETRIC, SIOCGIFMTU, SIOCGIFHWADDR,
SIOCGIFSLAVE, SIOCGIFMAP, SIOCGIFINDEX & SIOCGIFTXQLEN
can use RCU lock instead of dev_base_lock rwlock
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
---
net/core/dev.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index f54d8b8..c0f27ad 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4315,12 +4315,12 @@ int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
EXPORT_SYMBOL(dev_set_mac_address);
/*
- * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
+ * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
*/
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
{
int err;
- struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
+ struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
if (!dev)
return -ENODEV;
@@ -4552,9 +4552,9 @@ int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
case SIOCGIFINDEX:
case SIOCGIFTXQLEN:
dev_load(net, ifr.ifr_name);
- read_lock(&dev_base_lock);
+ rcu_read_lock();
ret = dev_ifsioc_locked(net, &ifr, cmd);
- read_unlock(&dev_base_lock);
+ rcu_read_unlock();
if (!ret) {
if (colon)
*colon = ':';
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH net-next-2.6] net: RCU locking for simple ioctl()
2009-11-02 5:42 [PATCH net-next-2.6] net: RCU locking for simple ioctl() Eric Dumazet
@ 2009-11-02 7:57 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2009-11-02 7:57 UTC (permalink / raw)
To: eric.dumazet; +Cc: netdev
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 02 Nov 2009 06:42:09 +0100
> All ioctls() implemented by dev_ifsioc_locked() :
> SIOCGIFFLAGS, SIOCGIFMETRIC, SIOCGIFMTU, SIOCGIFHWADDR,
> SIOCGIFSLAVE, SIOCGIFMAP, SIOCGIFINDEX & SIOCGIFTXQLEN
> can use RCU lock instead of dev_base_lock rwlock
>
> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Applied.
^ permalink raw reply [flat|nested] 2+ messages in thread
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