Merge tag 'efi-next-for-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

Pull EFI updates from Ard Biesheuvel:

 - Enable mirrored memory for arm64

 - Fix up several abuses of the efivar API

 - Refactor the efivar API in preparation for moving the 'business
   logic' part of it into efivarfs

 - Enable ACPI PRM on arm64

* tag 'efi-next-for-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi: (24 commits)
  ACPI: Move PRM config option under the main ACPI config
  ACPI: Enable Platform Runtime Mechanism(PRM) support on ARM64
  ACPI: PRM: Change handler_addr type to void pointer
  efi: Simplify arch_efi_call_virt() macro
  drivers: fix typo in firmware/efi/memmap.c
  efi: vars: Drop __efivar_entry_iter() helper which is no longer used
  efi: vars: Use locking version to iterate over efivars linked lists
  efi: pstore: Omit efivars caching EFI varstore access layer
  efi: vars: Add thin wrapper around EFI get/set variable interface
  efi: vars: Don't drop lock in the middle of efivar_init()
  pstore: Add priv field to pstore_record for backend specific use
  Input: applespi - avoid efivars API and invoke EFI services directly
  selftests/kexec: remove broken EFI_VARS secure boot fallback check
  brcmfmac: Switch to appropriate helper to load EFI variable contents
  iwlwifi: Switch to proper EFI variable store interface
  media: atomisp_gmin_platform: stop abusing efivar API
  efi: efibc: avoid efivar API for setting variables
  efi: avoid efivars layer when loading SSDTs from variables
  efi: Correct comment on efi_memmap_alloc
  memblock: Disable mirror feature if kernelcore is not specified
  ...

1 files changed, 6 insertions, 21 deletions

diff --git a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
index 7e47db82de07..bf527b366ab3 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
@@ -1284,7 +1284,7 @@ static int gmin_get_config_var(struct device *maindev,
 	const struct dmi_system_id *id;
 	struct device *dev = maindev;
 	char var8[CFG_VAR_NAME_MAX];
-	struct efivar_entry *ev;
+	efi_status_t status;
 	int i, ret;
 
 	/* For sensors, try first to use the _DSM table */
@@ -1326,24 +1326,11 @@ static int gmin_get_config_var(struct device *maindev,
 	for (i = 0; i < sizeof(var8) && var8[i]; i++)
 		var16[i] = var8[i];
 
-	/* Not sure this API usage is kosher; efivar_entry_get()'s
-	 * implementation simply uses VariableName and VendorGuid from
-	 * the struct and ignores the rest, but it seems like there
-	 * ought to be an "official" efivar_entry registered
-	 * somewhere?
-	 */
-	ev = kzalloc(sizeof(*ev), GFP_KERNEL);
-	if (!ev)
-		return -ENOMEM;
-	memcpy(&ev->var.VariableName, var16, sizeof(var16));
-	ev->var.VendorGuid = GMIN_CFG_VAR_EFI_GUID;
-	ev->var.DataSize = *out_len;
-
-	ret = efivar_entry_get(ev, &ev->var.Attributes,
-			       &ev->var.DataSize, ev->var.Data);
-	if (ret == 0) {
-		memcpy(out, ev->var.Data, ev->var.DataSize);
-		*out_len = ev->var.DataSize;
+	status = EFI_UNSUPPORTED;
+	if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
+		status = efi.get_variable(var16, &GMIN_CFG_VAR_EFI_GUID, NULL,
+					  (unsigned long *)out_len, out);
+	if (status == EFI_SUCCESS) {
 		dev_info(maindev, "found EFI entry for '%s'\n", var8);
 	} else if (is_gmin) {
 		dev_info(maindev, "Failed to find EFI gmin variable %s\n", var8);
@@ -1351,8 +1338,6 @@ static int gmin_get_config_var(struct device *maindev,
 		dev_info(maindev, "Failed to find EFI variable %s\n", var8);
 	}
 
-	kfree(ev);
-
 	return ret;
 }