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efi: vars: Switch to new wrapper layer
Switch the caching linked-list efivars layer implementation to the newly introduced efivar get/set variable wrappers, instead of accessing the lock and the ops pointer directly. This will permit us to move this code out of the public efivars API, and into efivarfs once the obsolete sysfs access method is finally removed. Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel
parent
0f5b2c69a4
commit
bbc6d2c6ef
@ -408,28 +408,21 @@ static void dup_variable_bug(efi_char16_t *str16, efi_guid_t *vendor_guid,
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int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
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void *data, bool duplicates, struct list_head *head)
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{
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const struct efivar_operations *ops;
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unsigned long variable_name_size = 1024;
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efi_char16_t *variable_name;
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efi_status_t status;
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efi_guid_t vendor_guid;
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int err = 0;
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if (!__efivars)
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return -EFAULT;
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ops = __efivars->ops;
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variable_name = kzalloc(variable_name_size, GFP_KERNEL);
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if (!variable_name) {
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printk(KERN_ERR "efivars: Memory allocation failed.\n");
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return -ENOMEM;
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}
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if (down_interruptible(&efivars_lock)) {
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err = -EINTR;
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err = efivar_lock();
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if (err)
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goto free;
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}
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/*
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* Per EFI spec, the maximum storage allocated for both
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@ -439,9 +432,9 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
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do {
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variable_name_size = 1024;
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status = ops->get_next_variable(&variable_name_size,
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variable_name,
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&vendor_guid);
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status = efivar_get_next_variable(&variable_name_size,
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variable_name,
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&vendor_guid);
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switch (status) {
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case EFI_SUCCESS:
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variable_name_size = var_name_strnsize(variable_name,
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@ -483,7 +476,7 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
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} while (status != EFI_NOT_FOUND);
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up(&efivars_lock);
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efivar_unlock();
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free:
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kfree(variable_name);
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@ -500,10 +493,13 @@ EXPORT_SYMBOL_GPL(efivar_init);
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*/
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int efivar_entry_add(struct efivar_entry *entry, struct list_head *head)
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{
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if (down_interruptible(&efivars_lock))
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return -EINTR;
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int err;
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err = efivar_lock();
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if (err)
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return err;
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list_add(&entry->list, head);
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up(&efivars_lock);
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efivar_unlock();
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return 0;
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}
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@ -544,7 +540,7 @@ EXPORT_SYMBOL_GPL(efivar_entry_remove);
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static void efivar_entry_list_del_unlock(struct efivar_entry *entry)
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{
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list_del(&entry->list);
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up(&efivars_lock);
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efivar_unlock();
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}
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/**
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@ -560,22 +556,18 @@ static void efivar_entry_list_del_unlock(struct efivar_entry *entry)
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*/
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int efivar_entry_delete(struct efivar_entry *entry)
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{
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const struct efivar_operations *ops;
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efi_status_t status;
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int err;
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if (down_interruptible(&efivars_lock))
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return -EINTR;
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err = efivar_lock();
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if (err)
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return err;
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if (!__efivars) {
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up(&efivars_lock);
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return -EINVAL;
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}
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ops = __efivars->ops;
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status = ops->set_variable(entry->var.VariableName,
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&entry->var.VendorGuid,
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0, 0, NULL);
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status = efivar_set_variable_locked(entry->var.VariableName,
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&entry->var.VendorGuid,
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0, 0, NULL, false);
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if (!(status == EFI_SUCCESS || status == EFI_NOT_FOUND)) {
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up(&efivars_lock);
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efivar_unlock();
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return efi_status_to_err(status);
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}
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@ -591,21 +583,18 @@ EXPORT_SYMBOL_GPL(efivar_entry_delete);
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*/
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int efivar_entry_size(struct efivar_entry *entry, unsigned long *size)
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{
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const struct efivar_operations *ops;
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efi_status_t status;
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int err;
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*size = 0;
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if (down_interruptible(&efivars_lock))
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return -EINTR;
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if (!__efivars) {
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up(&efivars_lock);
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return -EINVAL;
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}
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ops = __efivars->ops;
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status = ops->get_variable(entry->var.VariableName,
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&entry->var.VendorGuid, NULL, size, NULL);
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up(&efivars_lock);
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err = efivar_lock();
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if (err)
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return err;
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status = efivar_get_variable(entry->var.VariableName,
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&entry->var.VendorGuid, NULL, size, NULL);
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efivar_unlock();
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if (status != EFI_BUFFER_TOO_SMALL)
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return efi_status_to_err(status);
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@ -621,21 +610,16 @@ EXPORT_SYMBOL_GPL(efivar_entry_size);
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* @size: size of @data buffer
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* @data: buffer to store variable data
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*
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* The caller MUST call efivar_entry_iter_begin() and
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* efivar_entry_iter_end() before and after the invocation of this
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* function, respectively.
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* The caller MUST hold the efivar lock when calling this function.
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*/
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int __efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
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unsigned long *size, void *data)
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{
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efi_status_t status;
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if (!__efivars)
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return -EINVAL;
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status = __efivars->ops->get_variable(entry->var.VariableName,
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&entry->var.VendorGuid,
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attributes, size, data);
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status = efivar_get_variable(entry->var.VariableName,
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&entry->var.VendorGuid,
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attributes, size, data);
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return efi_status_to_err(status);
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}
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@ -651,22 +635,15 @@ EXPORT_SYMBOL_GPL(__efivar_entry_get);
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int efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
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unsigned long *size, void *data)
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{
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efi_status_t status;
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int err;
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if (down_interruptible(&efivars_lock))
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return -EINTR;
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err = efivar_lock();
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if (err)
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return err;
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err = __efivar_entry_get(entry, attributes, size, data);
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efivar_unlock();
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if (!__efivars) {
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up(&efivars_lock);
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return -EINVAL;
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}
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status = __efivars->ops->get_variable(entry->var.VariableName,
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&entry->var.VendorGuid,
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attributes, size, data);
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up(&efivars_lock);
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return efi_status_to_err(status);
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return err;
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}
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EXPORT_SYMBOL_GPL(efivar_entry_get);
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@ -695,7 +672,6 @@ EXPORT_SYMBOL_GPL(efivar_entry_get);
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int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
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unsigned long *size, void *data, bool *set)
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{
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const struct efivar_operations *ops;
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efi_char16_t *name = entry->var.VariableName;
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efi_guid_t *vendor = &entry->var.VendorGuid;
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efi_status_t status;
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@ -711,13 +687,9 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
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* set_variable call, and removal of the variable from the efivars
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* list (in the case of an authenticated delete).
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*/
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if (down_interruptible(&efivars_lock))
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return -EINTR;
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if (!__efivars) {
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err = -EINVAL;
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goto out;
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}
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err = efivar_lock();
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if (err)
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return err;
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/*
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* Ensure that the available space hasn't shrunk below the safe level
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@ -735,9 +707,8 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
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}
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}
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ops = __efivars->ops;
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status = ops->set_variable(name, vendor, attributes, *size, data);
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status = efivar_set_variable_locked(name, vendor, attributes, *size,
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data, false);
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if (status != EFI_SUCCESS) {
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err = efi_status_to_err(status);
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goto out;
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@ -752,14 +723,14 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
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* happened.
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*/
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*size = 0;
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status = ops->get_variable(entry->var.VariableName,
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&entry->var.VendorGuid,
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NULL, size, NULL);
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status = efivar_get_variable(entry->var.VariableName,
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&entry->var.VendorGuid,
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NULL, size, NULL);
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if (status == EFI_NOT_FOUND)
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efivar_entry_list_del_unlock(entry);
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else
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up(&efivars_lock);
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efivar_unlock();
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if (status && status != EFI_BUFFER_TOO_SMALL)
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return efi_status_to_err(status);
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@ -767,7 +738,7 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
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return 0;
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out:
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up(&efivars_lock);
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efivar_unlock();
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return err;
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}
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@ -793,7 +764,7 @@ int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
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struct efivar_entry *entry, *n;
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int err = 0;
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err = down_interruptible(&efivars_lock);
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err = efivar_lock();
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if (err)
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return err;
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@ -802,7 +773,7 @@ int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
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if (err)
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break;
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}
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up(&efivars_lock);
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efivar_unlock();
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return err;
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}
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