[PATCH] ISDN Eicon driver: NULL pointer check inside spinlock

   Check for valid application pointer inside api spinlock
   in diva_send_message().

drivers/isdn/hardware/eicon/capifunc.c

-/* $Id: capifunc.c,v 1.60 2004/03/22 16:28:27 armin Exp $
+/* $Id: capifunc.c,v 1.61 2004/03/26 19:48:48 armin Exp $
  *
  * ISDN interface module for Eicon active cards DIVA.
  * CAPI Interface common functions
@@ -893,7 +893,10 @@ static u16 diva_send_message(struct capi_ctr *ctrl,
 		return CAPI_REGOSRESOURCEERR;
 	}
 
+	diva_os_enter_spin_lock(&api_lock, &old_irql, "send message");
+
 	if (!this->Id) {
+		diva_os_leave_spin_lock(&api_lock, &old_irql, "send message");
 		return CAPI_ILLAPPNR;
 	}
 
@@ -901,8 +904,6 @@ static u16 diva_send_message(struct capi_ctr *ctrl,
 	msg->header.controller = ControllerMap[card->Id]
 	    | (msg->header.controller & 0x80);	/* preserve external controller bit */
 
-	diva_os_enter_spin_lock(&api_lock, &old_irql, "send message");
-
 	switch (command) {
 	default:
 		xlog("\x00\x02", msg, 0x80, clength);