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efi: Use more granular check for availability for variable services

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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>
This commit is contained in:
Ard Biesheuvel 2020-01-23 09:12:00 +01:00
parent fe4db90a80
commit bf67fad19e
4 changed files with 11 additions and 23 deletions
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2
drivers/firmware/efi/efi-pstore.c
View File

@ -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())

28
drivers/firmware/efi/efi.c
View File

@ -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",

2
drivers/firmware/efi/efivars.c
View File

@ -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 */

2
fs/efivarfs/super.c
View File

@ -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())