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authorArd Biesheuvel <ardb@kernel.org>2020-01-23 09:12:00 +0100
committerArd Biesheuvel <ardb@kernel.org>2020-02-23 21:59:42 +0100
commitbf67fad19e493bd3f7267b35b97b860280f87acc (patch)
treee5e5de60a3e45e341044059f880504f283b87d10
parentfe4db90a80cd12ebe4efe385d40d6636330149ed (diff)
downloadlinux-bf67fad19e493bd3f7267b35b97b860280f87acc.tar.bz2
efi: Use more granular check for availability for variable services
The UEFI spec rev 2.8 permits firmware implementations to support only a subset of EFI runtime services at OS runtime (i.e., after the call to ExitBootServices()), so let's take this into account in the drivers that rely specifically on the availability of the EFI variable services. Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
-rw-r--r--drivers/firmware/efi/efi-pstore.c2
-rw-r--r--drivers/firmware/efi/efi.c28
-rw-r--r--drivers/firmware/efi/efivars.c2
-rw-r--r--fs/efivarfs/super.c2
4 files changed, 11 insertions, 23 deletions
diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c
index 9ea13e8d12ec..d2f6855d205b 100644
--- a/drivers/firmware/efi/efi-pstore.c
+++ b/drivers/firmware/efi/efi-pstore.c
@@ -356,7 +356,7 @@ static struct pstore_info efi_pstore_info = {
static __init int efivars_pstore_init(void)
{
- if (!efi_enabled(EFI_RUNTIME_SERVICES))
+ if (!efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES))
return 0;
if (!efivars_kobject())
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index a35230517f9c..abf4c02e0201 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -328,12 +328,13 @@ static int __init efisubsys_init(void)
return -ENOMEM;
}
- error = generic_ops_register();
- if (error)
- goto err_put;
-
- if (efi_enabled(EFI_RUNTIME_SERVICES))
+ if (efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES)) {
efivar_ssdt_load();
+ error = generic_ops_register();
+ if (error)
+ goto err_put;
+ platform_device_register_simple("efivars", 0, NULL, 0);
+ }
error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
if (error) {
@@ -358,7 +359,8 @@ static int __init efisubsys_init(void)
err_remove_group:
sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
err_unregister:
- generic_ops_unregister();
+ if (efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES))
+ generic_ops_unregister();
err_put:
kobject_put(efi_kobj);
return error;
@@ -650,20 +652,6 @@ void __init efi_systab_report_header(const efi_table_hdr_t *systab_hdr,
vendor);
}
-#ifdef CONFIG_EFI_VARS_MODULE
-static int __init efi_load_efivars(void)
-{
- struct platform_device *pdev;
-
- if (!efi_enabled(EFI_RUNTIME_SERVICES))
- return 0;
-
- pdev = platform_device_register_simple("efivars", 0, NULL, 0);
- return PTR_ERR_OR_ZERO(pdev);
-}
-device_initcall(efi_load_efivars);
-#endif
-
static __initdata char memory_type_name[][20] = {
"Reserved",
"Loader Code",
diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index 7576450c8254..d309abca5091 100644
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -664,7 +664,7 @@ int efivars_sysfs_init(void)
struct kobject *parent_kobj = efivars_kobject();
int error = 0;
- if (!efi_enabled(EFI_RUNTIME_SERVICES))
+ if (!efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES))
return -ENODEV;
/* No efivars has been registered yet */
diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
index fa4f6447ddad..12c66f5d92dd 100644
--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -252,7 +252,7 @@ static struct file_system_type efivarfs_type = {
static __init int efivarfs_init(void)
{
- if (!efi_enabled(EFI_RUNTIME_SERVICES))
+ if (!efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES))
return -ENODEV;
if (!efivars_kobject())