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char: Fix removing wrong GSource that be found by fd_in_tag 

We use fd_in_tag to find a GSource, fd_in_tag is return value of
g_source_attach(GSource *source, GMainContext *context), the return
value is unique only in the same context, so we may get the same
values with different 'context' parameters.

It is no problem to find the right fd_in_tag by using
 g_main_context_find_source_by_id(GMainContext *context, guint source_id)
while there is only one default main context.

But colo-compare tries to create/use its own context, and if we pass wrong
'context' parameter with right fd_in_tag, we will find a wrong GSource to handle.
We tried to fix the related codes in commit b43decb015,
but it didn't fix the bug completely, because we still have some codes didn't pass
*right* context parameter for remove_fd_in_watch().

Let's fix it by record the GSource directly instead of fd_in_tag.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <1492564532-91680-1-git-send-email-zhang.zhanghailiang@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
zhanghailiang 2017-04-19 09:15:32 +08:00 committed by Paolo Bonzini
parent 6103451aeb
commit b19456dd0e
8 changed files with 27 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
chardev/char-fd.c
View File

@ -58,7 +58,7 @@ static gboolean fd_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
ret = qio_channel_read(
chan, (gchar *)buf, len, NULL);
if (ret == 0) {
remove_fd_in_watch(chr, NULL);
remove_fd_in_watch(chr);
qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
return FALSE;
}
@ -89,9 +89,9 @@ static void fd_chr_update_read_handler(Chardev *chr,
{
FDChardev *s = FD_CHARDEV(chr);
remove_fd_in_watch(chr, NULL);
remove_fd_in_watch(chr);
if (s->ioc_in) {
chr->fd_in_tag = io_add_watch_poll(chr, s->ioc_in,
chr->gsource = io_add_watch_poll(chr, s->ioc_in,
fd_chr_read_poll,
fd_chr_read, chr,
context);
@ -103,7 +103,7 @@ static void char_fd_finalize(Object *obj)
Chardev *chr = CHARDEV(obj);
FDChardev *s = FD_CHARDEV(obj);
remove_fd_in_watch(chr, NULL);
remove_fd_in_watch(chr);
if (s->ioc_in) {
object_unref(OBJECT(s->ioc_in));
}

23
chardev/char-io.c
View File

@ -98,7 +98,7 @@ static GSourceFuncs io_watch_poll_funcs = {
.finalize = io_watch_poll_finalize,
};
guint io_add_watch_poll(Chardev *chr,
GSource *io_add_watch_poll(Chardev *chr,
QIOChannel *ioc,
IOCanReadHandler *fd_can_read,
QIOChannelFunc fd_read,
@ -106,7 +106,6 @@ guint io_add_watch_poll(Chardev *chr,
GMainContext *context)
{
IOWatchPoll *iwp;
int tag;
char *name;
iwp = (IOWatchPoll *) g_source_new(&io_watch_poll_funcs,
@ -122,21 +121,15 @@ guint io_add_watch_poll(Chardev *chr,
g_source_set_name((GSource *)iwp, name);
g_free(name);
tag = g_source_attach(&iwp->parent, context);
g_source_attach(&iwp->parent, context);
g_source_unref(&iwp->parent);
return tag;
return (GSource *)iwp;
}
static void io_remove_watch_poll(guint tag, GMainContext *context)
static void io_remove_watch_poll(GSource *source)
{
GSource *source;
IOWatchPoll *iwp;
g_return_if_fail(tag > 0);
source = g_main_context_find_source_by_id(context, tag);
g_return_if_fail(source != NULL);
iwp = io_watch_poll_from_source(source);
if (iwp->src) {
g_source_destroy(iwp->src);
@ -146,11 +139,11 @@ static void io_remove_watch_poll(guint tag, GMainContext *context)
g_source_destroy(&iwp->parent);
}
void remove_fd_in_watch(Chardev *chr, GMainContext *context)
void remove_fd_in_watch(Chardev *chr)
{
if (chr->fd_in_tag) {
io_remove_watch_poll(chr->fd_in_tag, context);
chr->fd_in_tag = 0;
if (chr->gsource) {
io_remove_watch_poll(chr->gsource);
chr->gsource = NULL;
}
}

4
chardev/char-io.h
View File

@ -29,14 +29,14 @@
#include "sysemu/char.h"
/* Can only be used for read */
guint io_add_watch_poll(Chardev *chr,
GSource *io_add_watch_poll(Chardev *chr,
QIOChannel *ioc,
IOCanReadHandler *fd_can_read,
QIOChannelFunc fd_read,
gpointer user_data,
GMainContext *context);
void remove_fd_in_watch(Chardev *chr, GMainContext *context);
void remove_fd_in_watch(Chardev *chr);
int io_channel_send(QIOChannel *ioc, const void *buf, size_t len);

6
chardev/char-pty.c
View File

@ -199,7 +199,7 @@ static void pty_chr_state(Chardev *chr, int connected)
g_source_remove(s->open_tag);
s->open_tag = 0;
}
remove_fd_in_watch(chr, NULL);
remove_fd_in_watch(chr);
s->connected = 0;
/* (re-)connect poll interval for idle guests: once per second.
* We check more frequently in case the guests sends data to
@ -215,8 +215,8 @@ static void pty_chr_state(Chardev *chr, int connected)
s->connected = 1;
s->open_tag = g_idle_add(qemu_chr_be_generic_open_func, chr);
}
if (!chr->fd_in_tag) {
chr->fd_in_tag = io_add_watch_poll(chr, s->ioc,
if (!chr->gsource) {
chr->gsource = io_add_watch_poll(chr, s->ioc,
pty_chr_read_poll,
pty_chr_read,
chr, NULL);

8
chardev/char-socket.c
View File

@ -327,7 +327,7 @@ static void tcp_chr_free_connection(Chardev *chr)
}
tcp_set_msgfds(chr, NULL, 0);
remove_fd_in_watch(chr, NULL);
remove_fd_in_watch(chr);
object_unref(OBJECT(s->sioc));
s->sioc = NULL;
object_unref(OBJECT(s->ioc));
@ -484,7 +484,7 @@ static void tcp_chr_connect(void *opaque)
s->connected = 1;
if (s->ioc) {
chr->fd_in_tag = io_add_watch_poll(chr, s->ioc,
chr->gsource = io_add_watch_poll(chr, s->ioc,
tcp_chr_read_poll,
tcp_chr_read,
chr, NULL);
@ -501,9 +501,9 @@ static void tcp_chr_update_read_handler(Chardev *chr,
return;
}
remove_fd_in_watch(chr, NULL);
remove_fd_in_watch(chr);
if (s->ioc) {
chr->fd_in_tag = io_add_watch_poll(chr, s->ioc,
chr->gsource = io_add_watch_poll(chr, s->ioc,
tcp_chr_read_poll,
tcp_chr_read, chr,
context);

8
chardev/char-udp.c
View File

@ -81,7 +81,7 @@ static gboolean udp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
ret = qio_channel_read(
s->ioc, (char *)s->buf, sizeof(s->buf), NULL);
if (ret <= 0) {
remove_fd_in_watch(chr, NULL);
remove_fd_in_watch(chr);
return FALSE;
}
s->bufcnt = ret;
@ -101,9 +101,9 @@ static void udp_chr_update_read_handler(Chardev *chr,
{
UdpChardev *s = UDP_CHARDEV(chr);
remove_fd_in_watch(chr, NULL);
remove_fd_in_watch(chr);
if (s->ioc) {
chr->fd_in_tag = io_add_watch_poll(chr, s->ioc,
chr->gsource = io_add_watch_poll(chr, s->ioc,
udp_chr_read_poll,
udp_chr_read, chr,
context);
@ -115,7 +115,7 @@ static void char_udp_finalize(Object *obj)
Chardev *chr = CHARDEV(obj);
UdpChardev *s = UDP_CHARDEV(obj);
remove_fd_in_watch(chr, NULL);
remove_fd_in_watch(chr);
if (s->ioc) {
object_unref(OBJECT(s->ioc));
}

2
chardev/char.c
View File

@ -560,7 +560,7 @@ void qemu_chr_fe_set_handlers(CharBackend *b,
cc = CHARDEV_GET_CLASS(s);
if (!opaque && !fd_can_read && !fd_read && !fd_event) {
fe_open = 0;
remove_fd_in_watch(s, context);
remove_fd_in_watch(s);
} else {
fe_open = 1;
}

2
include/sysemu/char.h
View File

@ -93,7 +93,7 @@ struct Chardev {
char *filename;
int logfd;
int be_open;
guint fd_in_tag;
GSource *gsource;
DECLARE_BITMAP(features, QEMU_CHAR_FEATURE_LAST);
QTAILQ_ENTRY(Chardev) next;
};