Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3f993063 NB |
2 | #include <linux/spinlock.h> |
3 | #include <linux/list.h> | |
8dcf07be | 4 | #include <linux/module.h> |
3f993063 NB |
5 | #include <target/iscsi/iscsi_transport.h> |
6 | ||
7 | static LIST_HEAD(g_transport_list); | |
8 | static DEFINE_MUTEX(transport_mutex); | |
9 | ||
10 | struct 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 | ||
29 | void iscsit_put_transport(struct iscsit_transport *t) | |
30 | { | |
2ed37f6c | 31 | module_put(t->owner); |
3f993063 NB |
32 | } |
33 | ||
34 | int 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 | ||
44 | return 0; | |
45 | } | |
46 | EXPORT_SYMBOL(iscsit_register_transport); | |
47 | ||
48 | void iscsit_unregister_transport(struct iscsit_transport *t) | |
49 | { | |
50 | mutex_lock(&transport_mutex); | |
51 | list_del(&t->t_node); | |
52 | mutex_unlock(&transport_mutex); | |
53 | ||
54 | pr_debug("Unregistered iSCSI transport: %s\n", t->name); | |
55 | } | |
56 | EXPORT_SYMBOL(iscsit_unregister_transport); |