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-rw-r--r--include/linux/netdevice.h16
1 files changed, 13 insertions, 3 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index e393995d283..b0813c3286b 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -319,21 +319,29 @@ struct napi_struct {
enum
{
NAPI_STATE_SCHED, /* Poll is scheduled */
+ NAPI_STATE_DISABLE, /* Disable pending */
};
extern void FASTCALL(__napi_schedule(struct napi_struct *n));
+static inline int napi_disable_pending(struct napi_struct *n)
+{
+ return test_bit(NAPI_STATE_DISABLE, &n->state);
+}
+
/**
* napi_schedule_prep - check if napi can be scheduled
* @n: napi context
*
* Test if NAPI routine is already running, and if not mark
* it as running. This is used as a condition variable
- * insure only one NAPI poll instance runs
+ * insure only one NAPI poll instance runs. We also make
+ * sure there is no pending NAPI disable.
*/
static inline int napi_schedule_prep(struct napi_struct *n)
{
- return !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
+ return !napi_disable_pending(n) &&
+ !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
}
/**
@@ -389,8 +397,10 @@ static inline void napi_complete(struct napi_struct *n)
*/
static inline void napi_disable(struct napi_struct *n)
{
+ set_bit(NAPI_STATE_DISABLE, &n->state);
while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
msleep(1);
+ clear_bit(NAPI_STATE_DISABLE, &n->state);
}
/**
@@ -1268,7 +1278,7 @@ static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
static inline int netif_rx_schedule_prep(struct net_device *dev,
struct napi_struct *napi)
{
- return netif_running(dev) && napi_schedule_prep(napi);
+ return napi_schedule_prep(napi);
}
/* Add interface to tail of rx poll list. This assumes that _prep has