File dahdi-warn-on-once.diff of Package dahdi-linux

From: Jan Engelhardt <jengelh@medozas.de>
Date: 2011-10-17 21:16:28.811145336 +0200
Upstream: if you can get past the Asterisk Contributor Agreement for this GPL-only piece...

WARN_ON_ONCE was absent from wctdm24xxp.

---
 drivers/dahdi/wctdm24xxp/base.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

Index: b/drivers/dahdi/wctdm24xxp/base.c
===================================================================
--- a/drivers/dahdi/wctdm24xxp/base.c
+++ b/drivers/dahdi/wctdm24xxp/base.c
@@ -83,6 +83,20 @@ Tx Gain - W/Pre-Emphasis: -23.99 to 0.00
 #include "voicebus/GpakCust.h"
 #include "voicebus/GpakApi.h"
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18)
+#ifndef WARN_ON_ONCE
+#define WARN_ON_ONCE(__condition) do {         \
+	static int __once = 1;                 \
+	if (unlikely(__condition)) {           \
+		if (__once) {                  \
+			__once = 0;            \
+			WARN_ON(0);            \
+		}                              \
+	}                                      \
+} while (0)
+#endif
+#endif
+
 #if VOICEBUS_SFRAME_SIZE != SFRAME_SIZE
 #error SFRAME_SIZE must match the VOICEBUS_SFRAME_SIZE
 #endif