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From 9c6b84014b3650e478494d3c19b7461b947b3b14 Mon Sep 17 00:00:00 2001
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From: Gal Hammer <ghammer@redhat.com>
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Date: Sun, 16 Mar 2014 09:57:09 +0100
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Subject: [PATCH 01/31] char: restore read callback on a reattached (hotplug) chardev
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RH-Author: Gal Hammer <ghammer@redhat.com>
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Message-id: <1394963829-5384-1-git-send-email-ghammer@redhat.com>
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Patchwork-id: 58105
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O-Subject: [RHEL-7.0 qemu-kvm PATCH] char: restore read callback on a reattached (hotplug) chardev
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Bugzilla: 1038914
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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RH-Acked-by: Amit Shah <amit.shah@redhat.com>
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RH-Acked-by: Amos Kong <akong@redhat.com>
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Bugzilla: 1027181
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Brew: https://brewweb.devel.redhat.com/taskinfo?taskID=7207613
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Upstream: commit ac1b84dd1e020648db82a99260891aa982d1142c
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Fix a bug that was introduced in commit 386a5a1e. A removal of a device
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set the chr handlers to NULL. However when the device is plugged back,
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its read callback is not restored so data can't be transferred from the
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host to the guest (e.g. via the virtio-serial port).
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https://bugzilla.redhat.com/show_bug.cgi?id=1027181
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Signed-off-by: Gal Hammer <ghammer@redhat.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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---
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qemu-char.c | 17 +++++++++++++++--
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1 file changed, 15 insertions(+), 2 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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qemu-char.c | 17 +++++++++++++++--
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1 files changed, 15 insertions(+), 2 deletions(-)
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diff --git a/qemu-char.c b/qemu-char.c
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index 983f686..930f3d4 100644
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--- a/qemu-char.c
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+++ b/qemu-char.c
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@@ -215,7 +215,7 @@ void qemu_chr_add_handlers(CharDriverState *s,
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s->chr_read = fd_read;
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s->chr_event = fd_event;
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s->handler_opaque = opaque;
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- if (s->chr_update_read_handler)
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+ if (fe_open && s->chr_update_read_handler)
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s->chr_update_read_handler(s);
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if (!s->explicit_fe_open) {
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@@ -1140,13 +1140,14 @@ static void pty_chr_state(CharDriverState *chr, int connected)
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if (!s->connected) {
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s->connected = 1;
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qemu_chr_be_generic_open(chr);
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+ }
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+ if (!chr->fd_in_tag) {
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chr->fd_in_tag = io_add_watch_poll(s->fd, pty_chr_read_poll,
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pty_chr_read, chr);
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}
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}
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}
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-
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static void pty_chr_close(struct CharDriverState *chr)
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{
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PtyCharDriver *s = chr->opaque;
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@@ -2514,6 +2515,17 @@ static void tcp_chr_connect(void *opaque)
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qemu_chr_be_generic_open(chr);
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}
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+static void tcp_chr_update_read_handler(CharDriverState *chr)
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+{
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+ TCPCharDriver *s = chr->opaque;
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+
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+ remove_fd_in_watch(chr);
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+ if (s->chan) {
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+ chr->fd_in_tag = io_add_watch_poll(s->chan, tcp_chr_read_poll,
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+ tcp_chr_read, chr);
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+ }
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+}
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+
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#define IACSET(x,a,b,c) x[0] = a; x[1] = b; x[2] = c;
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static void tcp_chr_telnet_init(int fd)
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{
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@@ -2669,6 +2681,7 @@ static CharDriverState *qemu_chr_open_socket_fd(int fd, bool do_nodelay,
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chr->get_msgfd = tcp_get_msgfd;
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chr->chr_add_client = tcp_chr_add_client;
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chr->chr_add_watch = tcp_chr_add_watch;
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+ chr->chr_update_read_handler = tcp_chr_update_read_handler;
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/* be isn't opened until we get a connection */
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chr->explicit_be_open = true;
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--
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1.7.1
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