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libvhost-user-glib: fix VugDev main fd cleanup 

If you try to make a device implementation that can handle multiple
connections and allow disconnections (which requires overriding the
VHOST_USER_NONE handling), then glib will warn that we remove a src
while it's still on the mainloop, and will poll() an FD that doesn't
exist anymore.

Fix this by making vug_source_new() require pairing with the new
vug_source_destroy() so we can keep the GSource referenced in the
meantime.

Note that this requires calling the new API in vhost-user-input.
vhost-user-gpu also uses vug_source_new(), but never seems to free
the result at all, so I haven't changed anything there.

Fixes: 8bb7ddb78a ("libvhost-user: add glib source helper")
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Message-Id: <20200123081708.7817-3-johannes@sipsolutions.net>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
master
Johannes Berg 2020-01-23 09:17:04 +01:00 committed by Michael S. Tsirkin
parent 8899d60142
commit a7290a79fa
3 changed files with 15 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
contrib/libvhost-user/libvhost-user-glib.c
View File

@ -91,7 +91,6 @@ vug_source_new(VugDev *gdev, int fd, GIOCondition cond,
g_source_add_poll(gsrc, &src->gfd);
id = g_source_attach(gsrc, NULL);
g_assert(id);
g_source_unref(gsrc);
return gsrc;
}
@ -131,6 +130,16 @@ static void vug_watch(VuDev *dev, int condition, void *data)
}
}
void vug_source_destroy(GSource *src)
{
if (!src) {
return;
}
g_source_destroy(src);
g_source_unref(src);
}
bool
vug_init(VugDev *dev, uint16_t max_queues, int socket,
vu_panic_cb panic, const VuDevIface *iface)
@ -144,7 +153,7 @@ vug_init(VugDev *dev, uint16_t max_queues, int socket,
}
dev->fdmap = g_hash_table_new_full(NULL, NULL, NULL,
(GDestroyNotify) g_source_destroy);
(GDestroyNotify) vug_source_destroy);
dev->src = vug_source_new(dev, socket, G_IO_IN, vug_watch, NULL);
@ -157,5 +166,5 @@ vug_deinit(VugDev *dev)
g_assert(dev);
g_hash_table_unref(dev->fdmap);
g_source_unref(dev->src);
vug_source_destroy(dev->src);
}

1
contrib/libvhost-user/libvhost-user-glib.h
View File

@ -31,5 +31,6 @@ void vug_deinit(VugDev *dev);
GSource *vug_source_new(VugDev *dev, int fd, GIOCondition cond,
vu_watch_cb vu_cb, gpointer data);
void vug_source_destroy(GSource *src);
#endif /* LIBVHOST_USER_GLIB_H */

6
contrib/vhost-user-input/main.c
View File

@ -187,7 +187,7 @@ vi_queue_set_started(VuDev *dev, int qidx, bool started)
}
if (!started && vi->evsrc) {
g_source_destroy(vi->evsrc);
vug_source_destroy(vi->evsrc);
vi->evsrc = NULL;
}
}
@ -401,9 +401,7 @@ main(int argc, char *argv[])
vug_deinit(&vi.dev);
if (vi.evsrc) {
g_source_unref(vi.evsrc);
}
vug_source_destroy(vi.evsrc);
g_array_free(vi.config, TRUE);
g_free(vi.queue);
return 0;