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chardev: fix incorrect unref of source

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glib reported error when pty chardev used:

$ ./qemu-system-x86_64 -chardev pty,id=foo -device isa-serial,chardev=foo
qemu-system-x86_64: -chardev pty,id=foo: char device redirected to /dev/pts/2 (label foo)
(qemu-system-x86_64:27885): GLib-CRITICAL **: g_source_unref: assertion 'source != NULL' failed
(qemu-system-x86_64:27885): GLib-CRITICAL **: g_source_unref: assertion 'source != NULL' failed

This patch fixes that.

Fixes: 2c716ba150 ("chardev: introduce qemu_chr_timeout_add_ms()")
CC: Paolo Bonzini <pbonzini@redhat.com>
Reported-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180118052049.31119-1-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Xu 2018-01-18 13:20:49 +08:00 committed by Paolo Bonzini
parent c6caae553c
commit 4e4b57342e
1 changed files with 26 additions and 22 deletions
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48
chardev/char-pty.c
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@ -51,23 +51,6 @@ typedef struct {
static void pty_chr_update_read_handler_locked(Chardev *chr);
static void pty_chr_state(Chardev *chr, int connected);
static gboolean pty_chr_timer(gpointer opaque)
{
struct Chardev *chr = CHARDEV(opaque);
PtyChardev *s = PTY_CHARDEV(opaque);
qemu_mutex_lock(&chr->chr_write_lock);
s->timer_src = NULL;
g_source_unref(s->open_source);
s->open_source = NULL;
if (!s->connected) {
/* Next poll ... */
pty_chr_update_read_handler_locked(chr);
}
qemu_mutex_unlock(&chr->chr_write_lock);
return FALSE;
}
static void pty_chr_timer_cancel(PtyChardev *s)
{
if (s->timer_src) {
@ -77,6 +60,31 @@ static void pty_chr_timer_cancel(PtyChardev *s)
}
}
static void pty_chr_open_src_cancel(PtyChardev *s)
{
if (s->open_source) {
g_source_destroy(s->open_source);
g_source_unref(s->open_source);
s->open_source = NULL;
}
}
static gboolean pty_chr_timer(gpointer opaque)
{
struct Chardev *chr = CHARDEV(opaque);
PtyChardev *s = PTY_CHARDEV(opaque);
qemu_mutex_lock(&chr->chr_write_lock);
pty_chr_timer_cancel(s);
pty_chr_open_src_cancel(s);
if (!s->connected) {
/* Next poll ... */
pty_chr_update_read_handler_locked(chr);
}
qemu_mutex_unlock(&chr->chr_write_lock);
return FALSE;
}
/* Called with chr_write_lock held. */
static void pty_chr_rearm_timer(Chardev *chr, int ms)
{
@ -195,11 +203,7 @@ static void pty_chr_state(Chardev *chr, int connected)
PtyChardev *s = PTY_CHARDEV(chr);
if (!connected) {
if (s->open_source) {
g_source_destroy(s->open_source);
g_source_unref(s->open_source);
s->open_source = NULL;
}
pty_chr_open_src_cancel(s);
remove_fd_in_watch(chr);
s->connected = 0;
/* (re-)connect poll interval for idle guests: once per second.