diff options
| -rw-r--r-- | drivers/firmware/efivars.c | 85 | ||||
| -rw-r--r-- | include/linux/efi.h | 3 |
2 files changed, 82 insertions, 6 deletions
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c index a64fb7bda36..69225115304 100644 --- a/drivers/firmware/efivars.c +++ b/drivers/firmware/efivars.c @@ -158,6 +158,13 @@ efivar_create_sysfs_entry(struct efivars *efivars, efi_char16_t *variable_name, efi_guid_t *vendor_guid); +/* + * Prototype for workqueue functions updating sysfs entry + */ + +static void efivar_update_sysfs_entries(struct work_struct *); +static DECLARE_WORK(efivar_work, efivar_update_sysfs_entries); + /* Return the number of unicode characters in data */ static unsigned long utf16_strnlen(efi_char16_t *s, size_t maxlength) @@ -1248,11 +1255,8 @@ static int efi_pstore_write(enum pstore_type_id type, spin_unlock_irqrestore(&efivars->lock, flags); - if (size) - ret = efivar_create_sysfs_entry(efivars, - utf16_strsize(efi_name, - DUMP_NAME_LEN * 2), - efi_name, &vendor); + if (reason == KMSG_DUMP_OOPS) + schedule_work(&efivar_work); *id = part; return ret; @@ -1496,6 +1500,75 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, return count; } +static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor) +{ + struct efivar_entry *entry, *n; + struct efivars *efivars = &__efivars; + unsigned long strsize1, strsize2; + bool found = false; + + strsize1 = utf16_strsize(variable_name, 1024); + list_for_each_entry_safe(entry, n, &efivars->list, list) { + strsize2 = utf16_strsize(entry->var.VariableName, 1024); + if (strsize1 == strsize2 && + !memcmp(variable_name, &(entry->var.VariableName), + strsize2) && + !efi_guidcmp(entry->var.VendorGuid, + *vendor)) { + found = true; + break; + } + } + return found; +} + +static void efivar_update_sysfs_entries(struct work_struct *work) +{ + struct efivars *efivars = &__efivars; + efi_guid_t vendor; + efi_char16_t *variable_name; + unsigned long variable_name_size = 1024; + efi_status_t status = EFI_NOT_FOUND; + bool found; + + /* Add new sysfs entries */ + while (1) { + variable_name = kzalloc(variable_name_size, GFP_KERNEL); + if (!variable_name) { + pr_err("efivars: Memory allocation failed.\n"); + return; + } + + spin_lock_irq(&efivars->lock); + found = false; + while (1) { + variable_name_size = 1024; + status = efivars->ops->get_next_variable( + &variable_name_size, + variable_name, + &vendor); + if (status != EFI_SUCCESS) { + break; + } else { + if (!variable_is_present(variable_name, + &vendor)) { + found = true; + break; + } + } + } + spin_unlock_irq(&efivars->lock); + + if (!found) { + kfree(variable_name); + break; + } else + efivar_create_sysfs_entry(efivars, + variable_name_size, + variable_name, &vendor); + } +} + /* * Let's not leave out systab information that snuck into * the efivars driver @@ -1833,6 +1906,8 @@ err_put: static void __exit efivars_exit(void) { + cancel_work_sync(&efivar_work); + if (efi_enabled) { unregister_efivars(&__efivars); kobject_put(efi_kobj); diff --git a/include/linux/efi.h b/include/linux/efi.h index 8b84916dc67..d0c68aee092 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -728,7 +728,8 @@ struct efivars { * 1) ->list - adds, removals, reads, writes * 2) ops.[gs]et_variable() calls. * It must not be held when creating sysfs entries or calling kmalloc. - * ops.get_next_variable() is only called from register_efivars(), + * ops.get_next_variable() is only called from register_efivars() + * or efivar_update_sysfs_entries(), * which is protected by the BKL, so that path is safe. */ spinlock_t lock; |