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From a7f735cccb7d7b98998600eebc789c709eac5bca Mon Sep 17 00:00:00 2001
From: Fam Zheng <famz@redhat.com>
Date: Thu, 18 May 2017 09:21:18 +0200
Subject: [PATCH 05/18] char/serial: Fix emptyness check

RH-Author: Fam Zheng <famz@redhat.com>
Message-id: <20170518092131.16571-6-famz@redhat.com>
Patchwork-id: 75296
O-Subject: [RHEL-7.4 qemu-kvm PATCH v3 05/18] char/serial: Fix emptyness check
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: Peter Crosthwaite <peter.crosthwaite@xilinx.com>

This was guarding against a full fifo rather than an empty fifo when
popping. Fix.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
(cherry picked from commit 88c1ee73d3231c74ff90bcfc084a7589670ec244)
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 3345de1..489a885 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -225,7 +225,7 @@ static gboolean serial_xmit(GIOChannel *chan, GIOCondition cond, void *opaque)
 
     if (s->tsr_retry <= 0) {
         if (s->fcr & UART_FCR_FE) {
-            s->tsr = fifo8_is_full(&s->xmit_fifo) ?
+            s->tsr = fifo8_is_empty(&s->xmit_fifo) ?
                         0 : fifo8_pop(&s->xmit_fifo);
             if (!s->xmit_fifo.num) {
                 s->lsr |= UART_LSR_THRE;
-- 
1.8.3.1