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-rw-r--r--drivers/firmware/efi/vars.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/firmware/efi/vars.c b/drivers/firmware/efi/vars.c
index 0ba9f1831..4ca256bcd 100644
--- a/drivers/firmware/efi/vars.c
+++ b/drivers/firmware/efi/vars.c
@@ -66,19 +66,28 @@ int efivars_register(struct efivars *efivars,
const struct efivar_operations *ops,
struct kobject *kobject)
{
+ int rv;
+
if (down_interruptible(&efivars_lock))
return -EINTR;
+ if (__efivars) {
+ pr_warn("efivars already registered\n");
+ rv = -EBUSY;
+ goto out;
+ }
+
efivars->ops = ops;
efivars->kobject = kobject;
__efivars = efivars;
pr_info("Registered efivars operations\n");
-
+ rv = 0;
+out:
up(&efivars_lock);
- return 0;
+ return rv;
}
EXPORT_SYMBOL_GPL(efivars_register);