[PATCH] paride cleanup and fixes (1/25)

* new helper: pi_schedule_claimed() - pi_do_claimed() sans the call
  of continuation if we don't have to wait; returns 1 if we don't
  have to wait and 0 otherwise.

drivers/block/paride/paride.c

@@ -102,7 +102,7 @@ static void pi_wake_up(void *p)
 
 #endif
 
-void pi_do_claimed(PIA * pi, void (*cont) (void))
+int pi_schedule_claimed(PIA * pi, void (*cont) (void))
 {
 #ifdef CONFIG_PARPORT
 	unsigned long flags;
@@ -111,12 +111,19 @@ void pi_do_claimed(PIA * pi, void (*cont) (void))
 	if (pi->pardev && parport_claim(pi->pardev)) {
 		pi->claim_cont = cont;
 		spin_unlock_irqrestore(&pi_spinlock, flags);
-		return;
+		return 0;
 	}
 	pi->claimed = 1;
 	spin_unlock_irqrestore(&pi_spinlock, flags);
 #endif
-	cont();
+	return 1;
+}
+EXPORT_SYMBOL(pi_schedule_claimed);
+
+void pi_do_claimed(PIA * pi, void (*cont) (void))
+{
+	if (pi_schedule_claimed(pi, cont))
+		cont();
 }
 
 EXPORT_SYMBOL(pi_do_claimed);

drivers/block/paride/paride.h

@@ -93,6 +93,7 @@ extern void pi_connect(PIA *pi);
 extern void pi_disconnect(PIA *pi);
 
 extern void pi_do_claimed(PIA *pi, void (*cont)(void));
+extern int pi_schedule_claimed(PIA *pi, void (*cont)(void));
 
 /* macros and functions exported to the protocol modules */