wctdm24xxp: Check if the FXS signaling setting is valid.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9928 a0bf4364-ded3-4de4-8d8a-66a801d63aff

drivers/dahdi/wctdm24xxp/base.c

@@ -1743,6 +1743,11 @@ static void wctdm_fxs_hooksig(struct wctdm *wc, const int card, enum dahdi_txsig
 					SLIC_LF_RING_OPEN :
 					SLIC_LF_TIP_OPEN;
 			break;
+		default:
+			WARN_ONCE(1, "%x is an invalid signaling state for "
+				  "an FXS module.\n",
+				  wc->aspan->span.chans[card]->sig);
+			break;
 		}
 		break;
 	case DAHDI_TXSIG_OFFHOOK:

include/dahdi/kernel.h

@@ -1395,6 +1395,12 @@ typedef u32 __bitwise pm_message_t;
 #define DMA_BIT_MASK(n)	(((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
 #endif
 
+/* WARN_ONCE first showed up in the kernel in 2.6.27 but it may have been
+ * backported. */
+#ifndef WARN_ONCE
+#define WARN_ONCE(condition, format...) WARN_ON_ONCE(condition)
+#endif
+
 #define	DAHDI_CTL	0
 #define	DAHDI_TRANSCODE	250
 #define	DAHDI_TIMER	253