diff --git a/fs/dquot.c b/fs/dquot.c
index 0122a27..9af7895 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -834,6 +834,9 @@
 	if (!need_print_warning(dquot) || (flag && test_and_set_bit(flag, &dquot->dq_flags)))
 		return;
 
+	mutex_lock(&tty_mutex);
+	if (!current->signal->tty)
+		goto out_lock;
 	tty_write_message(current->signal->tty, dquot->dq_sb->s_id);
 	if (warntype == ISOFTWARN || warntype == BSOFTWARN)
 		tty_write_message(current->signal->tty, ": warning, ");
@@ -861,6 +864,8 @@
 			break;
 	}
 	tty_write_message(current->signal->tty, msg);
+out_lock:
+	mutex_unlock(&tty_mutex);
 }
 
 static inline void flush_warnings(struct dquot **dquots, char *warntype)