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qemu-char: ignore flow control if a PTY's slave is not connected

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After commit f702e62 (serial: change retry logic to avoid concurrency,
2014-07-11), guest boot hangs if the backend is an unconnected PTY.

The reason is that PTYs do not support G_IO_HUP, and serial_xmit is
never called.  To fix this, simply invoke serial_xmit immediately
(via g_idle_source_new) when this happens.

Tested-by: Pavel Hrdina <phrdina@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-07-24 16:08:04 +02:00
parent f368c33d5a
commit 62c339c527
1 changed files with 7 additions and 0 deletions
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7
qemu-char.c
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@ -1168,6 +1168,9 @@ static int pty_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
static GSource *pty_chr_add_watch(CharDriverState *chr, GIOCondition cond)
{
PtyCharDriver *s = chr->opaque;
if (!s->connected) {
return NULL;
}
return g_io_create_watch(s->fd, cond);
}
@ -3664,6 +3667,10 @@ int qemu_chr_fe_add_watch(CharDriverState *s, GIOCondition cond,
}
src = s->chr_add_watch(s, cond);
if (!src) {
return -EINVAL;
}
g_source_set_callback(src, (GSourceFunc)func, user_data, NULL);
tag = g_source_attach(src, NULL);
g_source_unref(src);