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target: simplify the target template registration API

Browse source 
Instead of calling target_fabric_configfs_init() +
target_fabric_configfs_register() / target_fabric_configfs_deregister()
target_fabric_configfs_free() from every target driver, rewrite the API
so that we have simple register/unregister functions that operate on
a const operations vector.

This patch also fixes a memory leak in several target drivers. Several
target drivers namely called target_fabric_configfs_deregister()
without calling target_fabric_configfs_free().

A large part of this patch is based on earlier changes from
Bart Van Assche <[email protected]>.

(v2: Add a new TF_CIT_SETUP_DRV macro so that the core configfs code
can declare attributes as either core only or for drivers)

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Nicholas Bellinger <[email protected]>
This commit is contained in:
Christoph Hellwig 2015-04-08 20:01:35 +02:00 • committed by Nicholas Bellinger
commit 9ac8928e6a
25 changed files with 356 additions and 927 deletions
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57
drivers/usb/gadget/legacy/tcm_usb_gadget.c
View file

@ -29,7 +29,7 @@
USB_GADGET_COMPOSITE_OPTIONS();
static struct target_fabric_configfs *usbg_fabric_configfs;
static const struct target_core_fabric_ops usbg_ops;
static inline struct f_uas *to_f_uas(struct usb_function *f)
{
@ -1572,8 +1572,7 @@ static struct se_portal_group *usbg_make_tpg(
tpg->tport = tport;
tpg->tport_tpgt = tpgt;
ret = core_tpg_register(&usbg_fabric_configfs->tf_ops, wwn,
&tpg->se_tpg, tpg,
ret = core_tpg_register(&usbg_ops, wwn, &tpg->se_tpg, tpg,
TRANSPORT_TPG_TYPE_NORMAL);
if (ret < 0) {
destroy_workqueue(tpg->workqueue);
@ -1865,7 +1864,9 @@ static int usbg_check_stop_free(struct se_cmd *se_cmd)
return 1;
}
static struct target_core_fabric_ops usbg_ops = {
static const struct target_core_fabric_ops usbg_ops = {
.module = THIS_MODULE,
.name = "usb_gadget",
.get_fabric_name = usbg_get_fabric_name,
.get_fabric_proto_ident = usbg_get_fabric_proto_ident,
.tpg_get_wwn = usbg_get_fabric_wwn,
@ -1907,46 +1908,9 @@ static struct target_core_fabric_ops usbg_ops = {
.fabric_drop_np = NULL,
.fabric_make_nodeacl = usbg_make_nodeacl,
.fabric_drop_nodeacl = usbg_drop_nodeacl,
};
static int usbg_register_configfs(void)
{
struct target_fabric_configfs *fabric;
int ret;
fabric = target_fabric_configfs_init(THIS_MODULE, "usb_gadget");
if (IS_ERR(fabric)) {
printk(KERN_ERR "target_fabric_configfs_init() failed\n");
return PTR_ERR(fabric);
}
fabric->tf_ops = usbg_ops;
fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = usbg_wwn_attrs;
fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = usbg_base_attrs;
fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
ret = target_fabric_configfs_register(fabric);
if (ret < 0) {
printk(KERN_ERR "target_fabric_configfs_register() failed"
" for usb-gadget\n");
return ret;
}
usbg_fabric_configfs = fabric;
return 0;
};
static void usbg_deregister_configfs(void)
{
if (!(usbg_fabric_configfs))
return;
target_fabric_configfs_deregister(usbg_fabric_configfs);
usbg_fabric_configfs = NULL;
.tfc_wwn_attrs = usbg_wwn_attrs,
.tfc_tpg_base_attrs = usbg_base_attrs,
};
/* Start gadget.c code */
@ -2455,16 +2419,13 @@ static void usbg_detach(struct usbg_tpg *tpg)
static int __init usb_target_gadget_init(void)
{
int ret;
ret = usbg_register_configfs();
return ret;
return target_register_template(&usbg_ops);
}
module_init(usb_target_gadget_init);
static void __exit usb_target_gadget_exit(void)
{
usbg_deregister_configfs();
target_unregister_template(&usbg_ops);
}
module_exit(usb_target_gadget_exit);