diff --git a/drivers/net/wan/farsync.c b/drivers/net/wan/farsync.c
index 7575b799ce53..7217d44e8854 100644
--- a/drivers/net/wan/farsync.c
+++ b/drivers/net/wan/farsync.c
@@ -981,6 +981,7 @@ fst_issue_cmd(struct fst_port_info *port, unsigned short cmd)
 	/* Wait for any previous command to complete */
 	while (mbval > NAK) {
 		spin_unlock_irqrestore(&card->card_lock, flags);
+		set_current_state(TASK_UNINTERRUPTIBLE);
 		schedule_timeout(1);
 		spin_lock_irqsave(&card->card_lock, flags);