73 lines
2.8 KiB
Diff
73 lines
2.8 KiB
Diff
From 46979f6e61d0afc31be31dab797f60c4f41c3de5 Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
|
|
Date: Fri, 20 Jul 2018 12:18:00 +0200
|
|
Subject: [PATCH 255/268] hw/char/serial: retry write if EAGAIN
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
|
|
Message-id: <20180720121800.18952-3-marcandre.lureau@redhat.com>
|
|
Patchwork-id: 81455
|
|
O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH v2 2/2] hw/char/serial: retry write if EAGAIN
|
|
Bugzilla: 1592817
|
|
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
RH-Acked-by: Markus Armbruster <armbru@redhat.com>
|
|
RH-Acked-by: John Snow <jsnow@redhat.com>
|
|
|
|
If the chardev returns -1 with EAGAIN errno on write(), it should try
|
|
to send it again (EINTR is handled by the chardev itself).
|
|
|
|
This fixes commit 019288bf137183bf3407c9824655b753bfafc99f
|
|
"hw/char/serial: Only retry if qemu_chr_fe_write returns 0"
|
|
|
|
Tested-by: Igor Mammedov <imammedo@redhat.com>
|
|
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
|
|
Message-Id: <20180716110755.12499-1-marcandre.lureau@redhat.com>
|
|
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
|
|
|
|
(cherry picked from commit f3575af130c700cea060b51a89008a76dae22259)
|
|
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
|
|
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
---
|
|
hw/char/serial.c | 23 ++++++++++++++---------
|
|
1 file changed, 14 insertions(+), 9 deletions(-)
|
|
|
|
diff --git a/hw/char/serial.c b/hw/char/serial.c
|
|
index d4057bf..478f9a8 100644
|
|
--- a/hw/char/serial.c
|
|
+++ b/hw/char/serial.c
|
|
@@ -262,15 +262,20 @@ static void serial_xmit(SerialState *s)
|
|
if (s->mcr & UART_MCR_LOOP) {
|
|
/* in loopback mode, say that we just received a char */
|
|
serial_receive1(s, &s->tsr, 1);
|
|
- } else if (qemu_chr_fe_write(&s->chr, &s->tsr, 1) == 0 &&
|
|
- s->tsr_retry < MAX_XMIT_RETRY) {
|
|
- assert(s->watch_tag == 0);
|
|
- s->watch_tag =
|
|
- qemu_chr_fe_add_watch(&s->chr, G_IO_OUT | G_IO_HUP,
|
|
- serial_watch_cb, s);
|
|
- if (s->watch_tag > 0) {
|
|
- s->tsr_retry++;
|
|
- return;
|
|
+ } else {
|
|
+ int rc = qemu_chr_fe_write(&s->chr, &s->tsr, 1);
|
|
+
|
|
+ if ((rc == 0 ||
|
|
+ (rc == -1 && errno == EAGAIN)) &&
|
|
+ s->tsr_retry < MAX_XMIT_RETRY) {
|
|
+ assert(s->watch_tag == 0);
|
|
+ s->watch_tag =
|
|
+ qemu_chr_fe_add_watch(&s->chr, G_IO_OUT | G_IO_HUP,
|
|
+ serial_watch_cb, s);
|
|
+ if (s->watch_tag > 0) {
|
|
+ s->tsr_retry++;
|
|
+ return;
|
|
+ }
|
|
}
|
|
}
|
|
s->tsr_retry = 0;
|
|
--
|
|
1.8.3.1
|
|
|