From c18370f5b2949d9cca519355f33690b75e1e7c8b Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Thu, 10 Jun 2010 16:12:49 +0000 Subject: [PATCH] netpoll: Add netpoll_tx_running This patch adds the helper netpoll_tx_running for use within ndo_start_xmit. It returns non-zero if ndo_start_xmit is being invoked by netpoll, and zero otherwise. This is currently implemented by simply looking at the hardirq count. This is because for all non-netpoll uses of ndo_start_xmit, IRQs must be enabled while netpoll always disables IRQs before calling ndo_start_xmit. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- include/linux/netpoll.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h index f3ad74af7e1f..4c77fe78ceff 100644 --- a/include/linux/netpoll.h +++ b/include/linux/netpoll.h @@ -116,6 +116,11 @@ static inline void netpoll_poll_unlock(void *have) } } +static inline int netpoll_tx_running(struct net_device *dev) +{ + return irqs_disabled(); +} + #else static inline int netpoll_rx(struct sk_buff *skb) { @@ -139,6 +144,10 @@ static inline void netpoll_poll_unlock(void *have) static inline void netpoll_netdev_init(struct net_device *dev) { } +static inline int netpoll_tx_running(struct net_device *dev) +{ + return 0; +} #endif #endif -- 2.20.1