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From a14715c6b64f4764259028923a9c04ae7844c546 Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Fri, 19 May 2017 00:35:11 +0200
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Subject: [PATCH 06/18] char/serial: Fix emptyness handling
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <20170519003523.21163-7-famz@redhat.com>
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Patchwork-id: 75359
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O-Subject: [RHEL-7.3.z qemu-kvm PATCH 06/18] char/serial: Fix emptyness handling
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Bugzilla: 1452332
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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From: Don Slutz <dslutz@verizon.com>
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The commit 88c1ee73d3231c74ff90bcfc084a7589670ec244
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char/serial: Fix emptyness check
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Still causes extra NULL byte(s) to be sent.
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So if the fifo is empty, do not send an extra NULL byte.
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Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
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Signed-off-by: Don Slutz <dslutz@verizon.com>
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Message-id: 1395160174-16006-1-git-send-email-dslutz@verizon.com
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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(cherry picked from commit dffacd4654ec8bf2898aed230852154c6ed755ed)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/char/serial.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/hw/char/serial.c b/hw/char/serial.c
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index 489a885..e020b0e 100644
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--- a/hw/char/serial.c
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+++ b/hw/char/serial.c
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@@ -225,8 +225,10 @@ static gboolean serial_xmit(GIOChannel *chan, GIOCondition cond, void *opaque)
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if (s->tsr_retry <= 0) {
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if (s->fcr & UART_FCR_FE) {
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- s->tsr = fifo8_is_empty(&s->xmit_fifo) ?
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- 0 : fifo8_pop(&s->xmit_fifo);
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+ if (fifo8_is_empty(&s->xmit_fifo)) {
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+ return FALSE;
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+ }
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+ s->tsr = fifo8_pop(&s->xmit_fifo);
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if (!s->xmit_fifo.num) {
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s->lsr |= UART_LSR_THRE;
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}
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--
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1.8.3.1
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