efi_loader: remove efi_disk_is_system_part()

The block IO protocol may be installed on any handle. We should make
no assumption about the structure the handle points to.

efi_disk_is_system_part() makes an illegal widening cast from a handle
to a struct efi_disk_obj. Remove the function.

Fixes: Fixes: 41fd506842c2 ("efi_loader: disk: add efi_disk_is_system_part()")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

2 files changed, 9 insertions, 31 deletions

diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
index 011942bbb7..f00440163d 100644
--- a/lib/efi_loader/efi_capsule.c
+++ b/lib/efi_loader/efi_capsule.c
@@ -669,22 +669,29 @@ static efi_status_t get_dp_device(u16 *boot_var,
 
 /**
  * device_is_present_and_system_part - check if a device exists
- * @dp		Device path
  *
  * Check if a device pointed to by the device path, @dp, exists and is
  * located in UEFI system partition.
  *
+ * @dp		device path
  * Return:	true - yes, false - no
  */
 static bool device_is_present_and_system_part(struct efi_device_path *dp)
 {
 	efi_handle_t handle;
+	struct efi_device_path *rem;
 
+	/* Check device exists */
 	handle = efi_dp_find_obj(dp, NULL, NULL);
 	if (!handle)
 		return false;
 
-	return efi_disk_is_system_part(handle);
+	/* Check device is on system partition */
+	handle = efi_dp_find_obj(dp, &efi_system_partition_guid, &rem);
+	if (!handle)
+		return false;
+
+	return true;
 }
 
 /**
diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
index d36a35d94f..c905c12abc 100644
--- a/lib/efi_loader/efi_disk.c
+++ b/lib/efi_loader/efi_disk.c
@@ -587,32 +587,3 @@ efi_status_t efi_disk_register(void)
 
 	return EFI_SUCCESS;
 }
-
-/**
- * efi_disk_is_system_part() - check if handle refers to an EFI system partition
- *
- * @handle:	handle of partition
- *
- * Return:	true if handle refers to an EFI system partition
- */
-bool efi_disk_is_system_part(efi_handle_t handle)
-{
-	struct efi_handler *handler;
-	struct efi_disk_obj *diskobj;
-	struct disk_partition info;
-	efi_status_t ret;
-	int r;
-
-	/* check if this is a block device */
-	ret = efi_search_protocol(handle, &efi_block_io_guid, &handler);
-	if (ret != EFI_SUCCESS)
-		return false;
-
-	diskobj = container_of(handle, struct efi_disk_obj, header);
-
-	r = part_get_info(diskobj->desc, diskobj->part, &info);
-	if (r)
-		return false;
-
-	return !!(info.bootable & PART_EFI_SYSTEM_PARTITION);
-}