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char: restore read callback on a reattached (hotplug) chardev 

Fix a bug that was introduced in commit 386a5a1e. A removal of a device
set the chr handlers to NULL. However when the device is plugged back,
its read callback is not restored so data can't be transferred from the
host to the guest (e.g. via the virtio-serial port).

https://bugzilla.redhat.com/show_bug.cgi?id=1027181

Signed-off-by: Gal Hammer <ghammer@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit ac1b84dd1e)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Gal Hammer 2014-02-25 12:12:35 +02:00 committed by Michael Roth
parent ba014af39c
commit 248de52cf8
1 changed files with 15 additions and 2 deletions
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17
qemu-char.c
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@ -213,7 +213,7 @@ void qemu_chr_add_handlers(CharDriverState *s,
s->chr_read = fd_read;
s->chr_event = fd_event;
s->handler_opaque = opaque;
if (s->chr_update_read_handler)
if (fe_open && s->chr_update_read_handler)
s->chr_update_read_handler(s);
if (!s->explicit_fe_open) {
@ -1136,13 +1136,14 @@ static void pty_chr_state(CharDriverState *chr, int connected)
if (!s->connected) {
s->connected = 1;
qemu_chr_be_generic_open(chr);
}
if (!chr->fd_in_tag) {
chr->fd_in_tag = io_add_watch_poll(s->fd, pty_chr_read_poll,
pty_chr_read, chr);
}
}
}
static void pty_chr_close(struct CharDriverState *chr)
{
PtyCharDriver *s = chr->opaque;
@ -2510,6 +2511,17 @@ static void tcp_chr_connect(void *opaque)
qemu_chr_be_generic_open(chr);
}
static void tcp_chr_update_read_handler(CharDriverState *chr)
{
TCPCharDriver *s = chr->opaque;
remove_fd_in_watch(chr);
if (s->chan) {
chr->fd_in_tag = io_add_watch_poll(s->chan, tcp_chr_read_poll,
tcp_chr_read, chr);
}
}
#define IACSET(x,a,b,c) x[0] = a; x[1] = b; x[2] = c;
static void tcp_chr_telnet_init(int fd)
{
@ -2665,6 +2677,7 @@ static CharDriverState *qemu_chr_open_socket_fd(int fd, bool do_nodelay,
chr->get_msgfd = tcp_get_msgfd;
chr->chr_add_client = tcp_chr_add_client;
chr->chr_add_watch = tcp_chr_add_watch;
chr->chr_update_read_handler = tcp_chr_update_read_handler;
/* be isn't opened until we get a connection */
chr->explicit_be_open = true;