audit: make use of remaining sleep time from wait_for_auditd

If wait_for_auditd() times out, go immediately to the error function rather
than retesting the loop conditions.
Signed-off-by: NRichard Guy Briggs <rgb@redhat.com>
Signed-off-by: NEric Paris <eparis@redhat.com>

kernel/audit.c

@@ -1209,18 +1209,21 @@ static inline void audit_get_stamp(struct audit_context *ctx,
 /*
  * Wait for auditd to drain the queue a little
  */
-static void wait_for_auditd(unsigned long sleep_time)
+static unsigned long wait_for_auditd(unsigned long sleep_time)
 {
+	unsigned long timeout = sleep_time;
 	DECLARE_WAITQUEUE(wait, current);
 	set_current_state(TASK_UNINTERRUPTIBLE);
 	add_wait_queue(&audit_backlog_wait, &wait);
 
 	if (audit_backlog_limit &&
 	    skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
-		schedule_timeout(sleep_time);
+		timeout = schedule_timeout(sleep_time);
 
 	__set_current_state(TASK_RUNNING);
 	remove_wait_queue(&audit_backlog_wait, &wait);
+
+	return timeout;
 }
 
 /**
@@ -1267,8 +1270,9 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
 			sleep_time = timeout_start + audit_backlog_wait_time -
 					jiffies;
 			if ((long)sleep_time > 0) {
-				wait_for_auditd(sleep_time);
-				continue;
+				sleep_time = wait_for_auditd(sleep_time);
+				if ((long)sleep_time > 0)
+					continue;
 			}
 		}
 		if (audit_rate_check() && printk_ratelimit())