diff options
| -rw-r--r-- | drivers/firmware/efivars.c | 122 |
1 files changed, 67 insertions, 55 deletions
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c index 5633018..f22bfcf 100644 --- a/drivers/firmware/efivars.c +++ b/drivers/firmware/efivars.c @@ -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 @@ out_free: 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); - - /* 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; + unregister_efivars(efivars); - kset_unregister(efivars->kset); +out: + kfree(variable_name); -out_firmware_unregister: - kobject_put(efi_kobj); + return error; +} -out_free: - kfree(variable_name); +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); + unregister_efivars(&__efivars); + kobject_put(efi_kobj); + } return error; } @@ -800,22 +827,7 @@ out_free: 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); } |
