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fw_cfg: switch fw_cfg_find() to locate the fw_cfg device by type rather than path

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This will enable the fw_cfg device to be placed anywhere within the QOM tree
regardless of its machine location.

Note that we also add a comment to document the behaviour that we return NULL to
indicate failure where either no fw_cfg device or multiple fw_cfg devices are
found.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <1500025208-14827-2-git-send-email-mark.cave-ayland@ilande.co.uk>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Mark Cave-Ayland 2017-07-14 10:40:06 +01:00 committed by Eduardo Habkost
parent ebcc479eee
commit 6e99c075a0
1 changed files with 2 additions and 1 deletions
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3
hw/nvram/fw_cfg.c
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@ -1017,7 +1017,8 @@ FWCfgState *fw_cfg_init_mem(hwaddr ctl_addr, hwaddr data_addr)
FWCfgState *fw_cfg_find(void)
{
return FW_CFG(object_resolve_path(FW_CFG_PATH, NULL));
/* Returns NULL unless there is exactly one fw_cfg device */
return FW_CFG(object_resolve_path_type("", TYPE_FW_CFG, NULL));
}
static void fw_cfg_class_init(ObjectClass *klass, void *data)