From 932ff279a43ab7257942cddff2595acd541cc49b Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Fri, 9 Jun 2006 12:20:56 -0700 Subject: [NET]: Add netif_tx_lock Various drivers use xmit_lock internally to synchronise with their transmission routines. They do so without setting xmit_lock_owner. This is fine as long as netpoll is not in use. With netpoll it is possible for deadlocks to occur if xmit_lock_owner isn't set. This is because if a printk occurs while xmit_lock is held and xmit_lock_owner is not set can cause netpoll to attempt to take xmit_lock recursively. While it is possible to resolve this by getting netpoll to use trylock, it is suboptimal because netpoll's sole objective is to maximise the chance of getting the printk out on the wire. So delaying or dropping the message is to be avoided as much as possible. So the only alternative is to always set xmit_lock_owner. The following patch does this by introducing the netif_tx_lock family of functions that take care of setting/unsetting xmit_lock_owner. I renamed xmit_lock to _xmit_lock to indicate that it should not be used directly. I didn't provide irq versions of the netif_tx_lock functions since xmit_lock is meant to be a BH-disabling lock. This is pretty much a straight text substitution except for a small bug fix in winbond. It currently uses netif_stop_queue/spin_unlock_wait to stop transmission. This is unsafe as an IRQ can potentially wake up the queue. So it is safer to use netif_tx_disable. The hamradio bits used spin_lock_irq but it is unnecessary as xmit_lock must never be taken in an IRQ handler. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- drivers/net/bnx2.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/net/bnx2.c') diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c index 54161aef3cac..9c5a8842ed0f 100644 --- a/drivers/net/bnx2.c +++ b/drivers/net/bnx2.c @@ -2009,7 +2009,7 @@ bnx2_poll(struct net_device *dev, int *budget) return 1; } -/* Called with rtnl_lock from vlan functions and also dev->xmit_lock +/* Called with rtnl_lock from vlan functions and also netif_tx_lock * from set_multicast. */ static void @@ -4252,7 +4252,7 @@ bnx2_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid) } #endif -/* Called with dev->xmit_lock. +/* Called with netif_tx_lock. * hard_start_xmit is pseudo-lockless - a lock is only required when * the tx queue is full. This way, we get the benefit of lockless * operations most of the time without the complexities to handle -- cgit v1.2.3