eal/linux: fix secondary process crash for mp hotplug requests

[ upstream commit 66f7ee3f7ab1a7d0295464ab236d4ada08eedee3 ]

Secondary would crash if it tries to handle mp requests before memory
init, since globals such as eth_dev_shared_data_lock are not accessible
to it at this moment.

Fixes: 244d513 ("eal: enable hotplug on multi-process")

Signed-off-by: Zhihong Wang <wangzhihong.wzh@bytedance.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>

lib/eal/linux/eal.c

@@ -1061,12 +1061,6 @@ rte_eal_init(int argc, char **argv)
 		}
 	}
 
-	/* register multi-process action callbacks for hotplug */
-	if (eal_mp_dev_hotplug_init() < 0) {
-		rte_eal_init_alert("failed to register mp callback for hotplug");
-		return -1;
-	}
-
 	if (rte_bus_scan()) {
 		rte_eal_init_alert("Cannot scan the buses for devices");
 		rte_errno = ENODEV;
@@ -1205,6 +1199,12 @@ rte_eal_init(int argc, char **argv)
 		return -1;
 	}
 
+	/* register multi-process action callbacks for hotplug after memory init */
+	if (eal_mp_dev_hotplug_init() < 0) {
+		rte_eal_init_alert("failed to register mp callback for hotplug");
+		return -1;
+	}
+
 	if (rte_eal_tailqs_init() < 0) {
 		rte_eal_init_alert("Cannot init tail queues for objects");
 		rte_errno = EFAULT;