Some drivers with shared NAPI need a synchronization barrier.
Also suggested by Benjamin Herrenschmidt for EMAC.
Signed-off-by: Stephen Hemminger <[EMAIL PROTECTED]>
--- a/include/linux/netdevice.h 2007-10-17 08:45:32.000000000 -0700
+++ b/include/linux/netdevice.h 2007-10-17 08:47:54.000000000 -0700
@@ -407,6 +407,24 @@ static inline void napi_enable(struct na
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
--
Stephen Hemminger <[EMAIL PROTECTED]>
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