1 files changed, 1 insertions, 5 deletions

diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index cd13b91b9ff6..ab0d0b170816 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -186,9 +186,6 @@ static void tty_receive_char(struct tty_struct *tty, char ch)
                 }
         }
 
-        if((tty->flip.flag_buf_ptr == NULL) ||
-           (tty->flip.char_buf_ptr == NULL))
-                return;
         tty_insert_flip_char(tty, ch, TTY_NORMAL);
 }
 
@@ -653,8 +650,7 @@ void chan_interrupt(struct list_head *chans, struct work_struct *task,
                 chan = list_entry(ele, struct chan, list);
                 if(!chan->input || (chan->ops->read == NULL)) continue;
                 do {
-                        if((tty != NULL) &&
-                           (tty->flip.count >= TTY_FLIPBUF_SIZE)){
+                        if (tty && !tty_buffer_request_room(tty, 1)) {
                                 schedule_delayed_work(task, 1);
                                 goto out;
                         }