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Subject[PATCH v2 02/12] efivars: Make efivars bin_attributes dynamic
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Date
In preparation for encapsulating efivars, we need to have the
bin_attributes be dynamically allocated so that we can use their
->private fields to get back to the struct efivars structure.

Signed-off-by: Mike Waychison <mikew@google.com>
---
drivers/firmware/efivars.c | 93 ++++++++++++++++++++++++++++++++------------
1 files changed, 68 insertions(+), 25 deletions(-)
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index f10ecb6..528ce47 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -101,6 +101,7 @@ struct efivars {
spinlock_t lock;
struct list_head list;
struct kset *kset;
+ struct bin_attribute *new_var, *del_var;
};
static struct efivars __efivars;
static struct efivars *efivars = &__efivars;
@@ -525,16 +526,6 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
return count;
}

-static struct bin_attribute var_subsys_attr_new_var = {
- .attr = {.name = "new_var", .mode = 0200},
- .write = efivar_create,
-};
-
-static struct bin_attribute var_subsys_attr_del_var = {
- .attr = {.name = "del_var", .mode = 0200},
- .write = efivar_delete,
-};
-
/*
* Let's not leave out systab information that snuck into
* the efivars driver
@@ -640,6 +631,66 @@ efivar_create_sysfs_entry(unsigned long variable_name_size,

return 0;
}
+
+static int
+create_efivars_bin_attributes(struct efivars *efivars)
+{
+ struct bin_attribute *attr;
+ int error;
+
+ /* new_var */
+ attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+ if (!attr)
+ return -ENOMEM;
+
+ attr->attr.name = "new_var";
+ attr->attr.mode = 0200;
+ attr->write = efivar_create;
+ attr->private = efivars;
+ efivars->new_var = attr;
+
+ /* del_var */
+ attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+ if (!attr) {
+ error = -ENOMEM;
+ goto out_free;
+ }
+ attr->attr.name = "del_var";
+ attr->attr.mode = 0200;
+ attr->write = efivar_delete;
+ attr->private = efivars;
+ efivars->del_var = attr;
+
+ sysfs_bin_attr_init(efivars->new_var);
+ sysfs_bin_attr_init(efivars->del_var);
+
+ /* Register */
+ error = sysfs_create_bin_file(&efivars->kset->kobj,
+ efivars->new_var);
+ if (error) {
+ printk(KERN_ERR "efivars: unable to create new_var sysfs file"
+ " due to error %d\n", error);
+ goto out_free;
+ }
+ error = sysfs_create_bin_file(&efivars->kset->kobj,
+ efivars->del_var);
+ if (error) {
+ printk(KERN_ERR "efivars: unable to create del_var sysfs file"
+ " due to error %d\n", error);
+ sysfs_remove_bin_file(&efivars->kset->kobj,
+ efivars->new_var);
+ goto out_free;
+ }
+
+ return 0;
+out_free:
+ kfree(efivars->new_var);
+ efivars->new_var = NULL;
+ kfree(efivars->new_var);
+ efivars->new_var = NULL;
+ return error;
+}
+
/*
* For now we register the efi subsystem with the firmware subsystem
* and the vars subsystem with the efi subsystem. In the future, it
@@ -714,20 +765,7 @@ efivars_init(void)
}
} while (status != EFI_NOT_FOUND);

- /*
- * Now add attributes to allow creation of new vars
- * and deletion of existing ones...
- */
- error = sysfs_create_bin_file(&efivars->kset->kobj,
- &var_subsys_attr_new_var);
- if (error)
- printk(KERN_ERR "efivars: unable to create new_var sysfs file"
- " due to error %d\n", error);
- error = sysfs_create_bin_file(&efivars->kset->kobj,
- &var_subsys_attr_del_var);
- if (error)
- printk(KERN_ERR "efivars: unable to create del_var sysfs file"
- " due to error %d\n", error);
+ error = create_efivars_bin_attributes(efivars);

/* Don't forget the systab entry */
error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
@@ -758,7 +796,12 @@ efivars_exit(void)
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);
kobject_put(efi_kobj);
}


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