Multi-GPU hot plug

Hi， team!

I have a device with three cards, and the connectors are as follows:
The first connector:

root@dev:/sys/class/drm/card3-LVDS-2# cat connector_id
37

The second connector:

root@dev:/sys/class/drm/card2-LVDS-1# cat connector_id
37

The last one is HDMI:

root@dev:/sys/class/drm/card1-HDMI-A-1# cat connector_id
37

Currently we don't use the HDMI card in weston test, and I'm doing a test to disable one connector when the other display are working, when disabling one connector, the weston will free the frame-buffer associated to the connector that is disconnected, I check the source code of the weston, the connectors are all stored in one list, and find connector is use the connector_id as key, if the different connectors have the same connector id, then it will find a wrong connector.

struct drm_head *
drm_head_find_by_connector(struct drm_backend *backend, uint32_t connector_id)
{
	struct weston_head *base;
	struct drm_head *head;

	wl_list_for_each(base,
					 &backend->compositor->head_list, compositor_link)
	{
		head = to_drm_head(base);
		if (!head)
			continue;
		if (head->connector.connector_id == connector_id)
			return head;
	}

	return NULL;
}

BTW, I start weston with the following parameters:

ExecStart=/usr/bin/weston -Swayland-0 --debug --drm-device=card3 --additional-devices=card2 --use-pixman --flight-rec-scopes=

So I think the way drm_head_find_by_connector finds the connector is inappropriate in a multi-GPU situation.

Looking forward to your reply!

Snow
Best regards