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efivars: Parameterize operations. 

Instead of letting efivars access struct efi directly when dealing with
variables, use an operations structure.  This allows a later change to
reuse the efivars logic without having to pretend to support everything
in struct efi.

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 17:43:21 -08:00 committed by Greg Kroah-Hartman
parent 76b53f7c8b
commit 3295814d83
1 changed files with 37 additions and 24 deletions
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61
drivers/firmware/efivars.c
View File

@ -89,19 +89,26 @@ MODULE_DESCRIPTION("sysfs interface to EFI Variables");
MODULE_LICENSE("GPL");
MODULE_VERSION(EFIVARS_VERSION);
struct efivar_operations {
efi_get_variable_t *get_variable;
efi_get_next_variable_t *get_next_variable;
efi_set_variable_t *set_variable;
};
struct efivars {
/*
* ->lock protects two things:
* 1) ->list - adds, removals, reads, writes
* 2) efi.[gs]et_variable() calls.
* 2) ops.[gs]et_variable() calls.
* It must not be held when creating sysfs entries or calling kmalloc.
* efi.get_next_variable() is only called from register_efivars(),
* ops.get_next_variable() is only called from register_efivars(),
* which is protected by the BKL, so that path is safe.
*/
spinlock_t lock;
struct list_head list;
struct kset *kset;
struct bin_attribute *new_var, *del_var;
const struct efivar_operations *ops;
};
/*
@ -182,11 +189,11 @@ get_var_data(struct efivars *efivars, struct efi_variable *var)
spin_lock(&efivars->lock);
var->DataSize = 1024;
status = efi.get_variable(var->VariableName,
&var->VendorGuid,
&var->Attributes,
&var->DataSize,
var->Data);
status = efivars->ops->get_variable(var->VariableName,
&var->VendorGuid,
&var->Attributes,
&var->DataSize,
var->Data);
spin_unlock(&efivars->lock);
if (status != EFI_SUCCESS) {
printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n",
@ -299,11 +306,11 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
}
spin_lock(&efivars->lock);
status = efi.set_variable(new_var->VariableName,
&new_var->VendorGuid,
new_var->Attributes,
new_var->DataSize,
new_var->Data);
status = efivars->ops->set_variable(new_var->VariableName,
&new_var->VendorGuid,
new_var->Attributes,
new_var->DataSize,
new_var->Data);
spin_unlock(&efivars->lock);
@ -446,11 +453,11 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
}
/* now *really* create the variable via EFI */
status = efi.set_variable(new_var->VariableName,
&new_var->VendorGuid,
new_var->Attributes,
new_var->DataSize,
new_var->Data);
status = efivars->ops->set_variable(new_var->VariableName,
&new_var->VendorGuid,
new_var->Attributes,
new_var->DataSize,
new_var->Data);
if (status != EFI_SUCCESS) {
printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n",
@ -511,11 +518,11 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
del_var->Attributes = 0;
del_var->DataSize = 0;
status = efi.set_variable(del_var->VariableName,
&del_var->VendorGuid,
del_var->Attributes,
del_var->DataSize,
del_var->Data);
status = efivars->ops->set_variable(del_var->VariableName,
&del_var->VendorGuid,
del_var->Attributes,
del_var->DataSize,
del_var->Data);
if (status != EFI_SUCCESS) {
printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n",
@ -719,6 +726,7 @@ static void unregister_efivars(struct efivars *efivars)
}
static int register_efivars(struct efivars *efivars,
const struct efivar_operations *ops,
struct kobject *parent_kobj)
{
efi_status_t status = EFI_NOT_FOUND;
@ -735,6 +743,7 @@ static int register_efivars(struct efivars *efivars,
spin_lock_init(&efivars->lock);
INIT_LIST_HEAD(&efivars->list);
efivars->ops = ops;
efivars->kset = kset_create_and_add("vars", NULL, parent_kobj);
if (!efivars->kset) {
@ -751,7 +760,7 @@ static int register_efivars(struct efivars *efivars,
do {
variable_name_size = 1024;
status = efi.get_next_variable(&variable_name_size,
status = ops->get_next_variable(&variable_name_size,
variable_name,
&vendor_guid);
switch (status) {
@ -782,6 +791,7 @@ out:
}
static struct efivars __efivars;
static struct efivar_operations ops;
/*
* For now we register the efi subsystem with the firmware subsystem
@ -809,7 +819,10 @@ efivars_init(void)
return -ENOMEM;
}
error = register_efivars(&__efivars, efi_kobj);
ops.get_variable = efi.get_variable;
ops.set_variable = efi.set_variable;
ops.get_next_variable = efi.get_next_variable;
error = register_efivars(&__efivars, &ops, efi_kobj);
/* Don't forget the systab entry */
error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);