[PATCH] Fix yenta-socket oops

From: Russell King <rmk@arm.linux.org.uk>

Interrupts can sometimes occur before the socket thread is started.

drivers/pcmcia/cs.c

@@ -868,13 +868,19 @@ static int pccardd(void *__skt)
 	complete_and_exit(&skt->thread_done, 0);
 }
 
+/*
+ * Yenta (at least) probes interrupts before registering the socket and
+ * starting the handler thread.
+ */
 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
 {
+	if (s->thread) {
 		spin_lock(&s->thread_lock);
 		s->thread_events |= events;
 		spin_unlock(&s->thread_lock);
 
 		wake_up(&s->thread_wait);
+	}
 } /* pcmcia_parse_events */