[PATCH] NETPOLL: Fix TX queue overflow in trapped mode.

CONFIG_NETPOLL_TRAP causes the TX queue controls to be completely bypassed in
the netpoll's "trapped" mode which easily causes overflows in the drivers with
short TX queues (most notably, in 8139too with its 4-deep queue).  So, make
this option more sensible by making it only bypass the TX softirq wakeup.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Acked-by: Jeff Garzik <jgarzik@pobox.com>
Acked-by: Tom Rini <trini@kernel.crashing.org>
Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 1a528548cd1d89e5b690b2ad92e8ec6fee24532c..b1b0f68398ff762ab7068c0cd5ab585d3d5a1a97 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -647,8 +647,10 @@ static inline void netif_start_queue(struct net_device *dev)
 static inline void netif_wake_queue(struct net_device *dev)
 {
 #ifdef CONFIG_NETPOLL_TRAP
-       if (netpoll_trap())
+       if (netpoll_trap()) {
+               clear_bit(__LINK_STATE_XOFF, &dev->state);
                return;
+       }
 #endif
        if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
                __netif_schedule(dev);
@@ -656,10 +658,6 @@ static inline void netif_wake_queue(struct net_device *dev)
 
 static inline void netif_stop_queue(struct net_device *dev)
 {
-#ifdef CONFIG_NETPOLL_TRAP
-       if (netpoll_trap())
-               return;
-#endif
        set_bit(__LINK_STATE_XOFF, &dev->state);
 }