From 6239c2bb55847293db2defeff645e1d5e6456a19 Mon Sep 17 00:00:00 2001
From: Fam Zheng <famz@redhat.com>
Date: Thu, 18 May 2017 09:21:17 +0200
Subject: [PATCH 04/18] char/serial: fix copy&paste error (fifo8_is_full vs
 empty)

RH-Author: Fam Zheng <famz@redhat.com>
Message-id: <20170518092131.16571-5-famz@redhat.com>
Patchwork-id: 75294
O-Subject: [RHEL-7.4 qemu-kvm PATCH v3 04/18] char/serial: fix copy&paste error (fifo8_is_full vs empty)
Bugzilla: 1451470
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>

From: Vladimir Senkov <hangup@gmail.com>

Copy&paste error in serial.c causes a crash when attempting
to read from UART (if there is no data to be read)

Signed-off-by: Vladimir Senkov <hangup@gmail.com>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
(cherry picked from commit b165b0d8e62bb65a02d7670d75ebb77a9280bde1)
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 hw/char/serial.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/char/serial.c b/hw/char/serial.c
index 72112cc..3345de1 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -425,7 +425,7 @@ static uint64_t serial_ioport_read(void *opaque, hwaddr addr, unsigned size)
             ret = s->divider & 0xff;
         } else {
             if(s->fcr & UART_FCR_FE) {
-                ret = fifo8_is_full(&s->recv_fifo) ?
+                ret = fifo8_is_empty(&s->recv_fifo) ?
                             0 : fifo8_pop(&s->recv_fifo);
                 if (s->recv_fifo.num == 0) {
                     s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
-- 
1.8.3.1