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efivars: Split out variable registration 

In anticipation of re-using the variable facilities in efivars from
elsewhere, split out the registration and unregistration of struct
efivars from the rest of the EFI specific sysfs code.

Signed-off-by: Mike Waychison <mikew@google.com>
Cc: Matt Domsch <Matt_Domsch@dell.com>,
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Mike Waychison 2011-03-11 17:43:16 -08:00 committed by Greg Kroah-Hartman
parent 4142ef146a
commit 76b53f7c8b
1 changed files with 68 additions and 56 deletions
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124
drivers/firmware/efivars.c
View File

@ -95,7 +95,7 @@ struct efivars {
* 1) ->list - adds, removals, reads, writes
* 2) efi.[gs]et_variable() calls.
* It must not be held when creating sysfs entries or calling kmalloc.
* efi.get_next_variable() is only called from efivars_init(),
* efi.get_next_variable() is only called from register_efivars(),
* which is protected by the BKL, so that path is safe.
*/
spinlock_t lock;
@ -699,54 +699,48 @@ create_efivars_bin_attributes(struct efivars *efivars)
return error;
}
static struct efivars __efivars;
static void unregister_efivars(struct efivars *efivars)
{
struct efivar_entry *entry, *n;
/*
* For now we register the efi subsystem with the firmware subsystem
* and the vars subsystem with the efi subsystem. In the future, it
* might make sense to split off the efi subsystem into its own
* driver, but for now only efivars will register with it, so just
* include it here.
*/
list_for_each_entry_safe(entry, n, &efivars->list, list) {
spin_lock(&efivars->lock);
list_del(&entry->list);
spin_unlock(&efivars->lock);
efivar_unregister(entry);
}
if (efivars->new_var)
sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var);
if (efivars->del_var)
sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var);
kfree(efivars->new_var);
kfree(efivars->del_var);
kset_unregister(efivars->kset);
}
static int __init
efivars_init(void)
static int register_efivars(struct efivars *efivars,
struct kobject *parent_kobj)
{
efi_status_t status = EFI_NOT_FOUND;
efi_guid_t vendor_guid;
efi_char16_t *variable_name;
unsigned long variable_name_size = 1024;
struct efivars *efivars = &__efivars;
int error = 0;
if (!efi_enabled)
return -ENODEV;
variable_name = kzalloc(variable_name_size, GFP_KERNEL);
if (!variable_name) {
printk(KERN_ERR "efivars: Memory allocation failed.\n");
return -ENOMEM;
}
printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION,
EFIVARS_DATE);
/* For now we'll register the efi directory at /sys/firmware/efi */
efi_kobj = kobject_create_and_add("efi", firmware_kobj);
if (!efi_kobj) {
printk(KERN_ERR "efivars: Firmware registration failed.\n");
error = -ENOMEM;
goto out_free;
}
spin_lock_init(&efivars->lock);
INIT_LIST_HEAD(&efivars->list);
efivars->kset = kset_create_and_add("vars", NULL, efi_kobj);
efivars->kset = kset_create_and_add("vars", NULL, parent_kobj);
if (!efivars->kset) {
printk(KERN_ERR "efivars: Subsystem registration failed.\n");
error = -ENOMEM;
goto out_firmware_unregister;
goto out;
}
/*
@ -778,21 +772,54 @@ efivars_init(void)
} while (status != EFI_NOT_FOUND);
error = create_efivars_bin_attributes(efivars);
if (error)
unregister_efivars(efivars);
out:
kfree(variable_name);
return error;
}
static struct efivars __efivars;
/*
* For now we register the efi subsystem with the firmware subsystem
* and the vars subsystem with the efi subsystem. In the future, it
* might make sense to split off the efi subsystem into its own
* driver, but for now only efivars will register with it, so just
* include it here.
*/
static int __init
efivars_init(void)
{
int error = 0;
printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION,
EFIVARS_DATE);
if (!efi_enabled)
return -ENODEV;
/* For now we'll register the efi directory at /sys/firmware/efi */
efi_kobj = kobject_create_and_add("efi", firmware_kobj);
if (!efi_kobj) {
printk(KERN_ERR "efivars: Firmware registration failed.\n");
return -ENOMEM;
}
error = register_efivars(&__efivars, efi_kobj);
/* Don't forget the systab entry */
error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
if (error)
printk(KERN_ERR "efivars: Sysfs attribute export failed with error %d.\n", error);
else
goto out_free;
kset_unregister(efivars->kset);
out_firmware_unregister:
kobject_put(efi_kobj);
out_free:
kfree(variable_name);
if (error) {
printk(KERN_ERR
"efivars: Sysfs attribute export failed with error %d.\n",
error);
unregister_efivars(&__efivars);
kobject_put(efi_kobj);
}
return error;
}
@ -800,22 +827,7 @@ efivars_init(void)
static void __exit
efivars_exit(void)
{
struct efivars *efivars = &__efivars;
struct efivar_entry *entry, *n;
list_for_each_entry_safe(entry, n, &efivars->list, list) {
spin_lock(&efivars->lock);
list_del(&entry->list);
spin_unlock(&efivars->lock);
efivar_unregister(entry);
}
if (efivars->new_var)
sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var);
if (efivars->del_var)
sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var);
kfree(efivars->new_var);
kfree(efivars->del_var);
kset_unregister(efivars->kset);
unregister_efivars(&__efivars);
kobject_put(efi_kobj);
}