diff options
| -rw-r--r-- | drivers/firmware/efi/vars.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/firmware/efi/vars.c b/drivers/firmware/efi/vars.c index f34e7741e0c3..bd75b87f5fc1 100644 --- a/drivers/firmware/efi/vars.c +++ b/drivers/firmware/efi/vars.c @@ -62,18 +62,27 @@ EXPORT_SYMBOL_GPL(efivar_is_available); int efivars_register(struct efivars *efivars, const struct efivar_operations *ops) { + 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 = efivars; pr_info("Registered efivars operations\n"); - + rv = 0; +out: up(&efivars_lock); - return 0; + return rv; } EXPORT_SYMBOL_GPL(efivars_register); |