efi_loader: disk: install file system protocol to a whole disk

Currently, a whole disk without any partitions is not associated
with EFI_SIMPLE_FILE_SYSTEM_PROTOCOL. So even if it houses some
file system, there is a chance that we may not be able to access
it, particularly, when accesses are to be attempted after searching
that protocol against a device handle.

With this patch, EFI_SIMPLE_FILE_SYSTEM_PROTOCOL is installed
to such a disk if part_get_info() shows there is no partition
table installed on it.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Only if no partition table exists, check for a file system on disk level.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
index 861fcaf..ed7fb3f 100644 (file)
--- a/lib/efi_loader/efi_disk.c
+++ b/lib/efi_loader/efi_disk.c
@@ -337,7 +337,9 @@ static efi_status_t efi_disk_add_dev(
                               diskobj->dp);
        if (ret != EFI_SUCCESS)
                return ret;
-       if (part >= 1 && efi_fs_exists(desc, part)) {
+       /* partitions or whole disk without partitions */
+       if ((part || desc->part_type == PART_TYPE_UNKNOWN) &&
+           efi_fs_exists(desc, part)) {
                diskobj->volume = efi_simple_file_system(desc, part,
                                                         diskobj->dp);
                ret = efi_add_protocol(&diskobj->header,