From: Stephen Hemminger <shemminger@linux-foundation.org>
Date: Wed, 17 Oct 2007 20:26:41 +0000 (-0700)
Subject: napi_synchronize: waiting for NAPI
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c264c3dee9f20bad1f42ef5821300791291d0f77;p=linux-beck.git

napi_synchronize: waiting for NAPI

Some drivers with shared NAPI need a synchronization barrier.
Also suggested by Benjamin Herrenschmidt for EMAC.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
---

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 39dd83b183a9..a5e2dc1f0d98 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -407,6 +407,24 @@ static inline void napi_enable(struct napi_struct *n)
 	clear_bit(NAPI_STATE_SCHED, &n->state);
 }
 
+#ifdef CONFIG_SMP
+/**
+ *	napi_synchronize - wait until NAPI is not running
+ *	@n: napi context
+ *
+ * Wait until NAPI is done being scheduled on this context.
+ * Waits till any outstanding processing completes but
+ * does not disable future activations.
+ */
+static inline void napi_synchronize(const struct napi_struct *n)
+{
+	while (test_bit(NAPI_STATE_SCHED, &n->state))
+		msleep(1);
+}
+#else
+# define napi_synchronize(n)	barrier()
+#endif
+
 /*
  *	The DEVICE structure.
  *	Actually, this whole structure is a big mistake.  It mixes I/O