[U-Boot] [PATCH v5 1/1] efi_loader: disk: install file system protocol to a whole disk

Heinrich Schuchardt xypron.glpk at gmx.de
Sat Nov 2 18:59:06 UTC 2019

From: AKASHI Takahiro <takahiro.akashi at linaro.org>

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 at linaro.org>

Only if no partition table exists, check for a file system on disk level.
Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
 lib/efi_loader/efi_disk.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
index 861fcaf374..ed7fb3f7d3 100644
--- 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(
 	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,
 		ret = efi_add_protocol(&diskobj->header,

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