Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c264c3dee9f20bad1f42ef5821300791291d0f77
Commit: c264c3dee9f20bad1f42ef5821300791291d0f77
Parent: a7475906bc496456ded9e4b062f94067fb93057a
Author: Stephen Hemminger <[EMAIL PROTECTED]>
AuthorDate: Wed Oct 17 13:26:41 2007 -0700
Committer: Jeff Garzik <[EMAIL PROTECTED]>
CommitDate: Wed Oct 17 20:17:34 2007 -0400
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 <[EMAIL PROTECTED]>
Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
---
include/linux/netdevice.h | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 39dd83b..a5e2dc1 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
-
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