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1// SPDX-License-Identifier: GPL-2.02#include <linux/spinlock.h>3#include <linux/list.h>4#include <linux/module.h>5#include <target/iscsi/iscsi_transport.h>6 7static LIST_HEAD(g_transport_list);8static DEFINE_MUTEX(transport_mutex);9 10struct iscsit_transport *iscsit_get_transport(int type)11{12 struct iscsit_transport *t;13 14 mutex_lock(&transport_mutex);15 list_for_each_entry(t, &g_transport_list, t_node) {16 if (t->transport_type == type) {17 if (t->owner && !try_module_get(t->owner)) {18 t = NULL;19 }20 mutex_unlock(&transport_mutex);21 return t;22 }23 }24 mutex_unlock(&transport_mutex);25 26 return NULL;27}28 29void iscsit_put_transport(struct iscsit_transport *t)30{31 module_put(t->owner);32}33 34void iscsit_register_transport(struct iscsit_transport *t)35{36 INIT_LIST_HEAD(&t->t_node);37 38 mutex_lock(&transport_mutex);39 list_add_tail(&t->t_node, &g_transport_list);40 mutex_unlock(&transport_mutex);41 42 pr_debug("Registered iSCSI transport: %s\n", t->name);43}44EXPORT_SYMBOL(iscsit_register_transport);45 46void iscsit_unregister_transport(struct iscsit_transport *t)47{48 mutex_lock(&transport_mutex);49 list_del(&t->t_node);50 mutex_unlock(&transport_mutex);51 52 pr_debug("Unregistered iSCSI transport: %s\n", t->name);53}54EXPORT_SYMBOL(iscsit_unregister_transport);55