efi_loader: disk: allow blk devices even without UCLASS_PARTITION

While GPT partition is mandated in UEFI specification, CONFIG_PARTITION is
seen optional under the current implementation.
So modify efi_disk_rw_blocks() to allow accepting UCLASS_BLK devices.

Fixes: commit d97e98c887ed ("efi_loader: disk: use udevice instead of blk_desc")
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Tested-by: Mark Kettenis <kettenis@openbsd.org>

diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
index 8fb5b2363c451202275ada9ca9208241e15376f7..f5b462fb164a7ef3d1e361940008589b54e1200d 100644 (file)
--- a/lib/efi_loader/efi_disk.c
+++ b/lib/efi_loader/efi_disk.c
@@ -99,21 +99,22 @@ static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this,
        if (buffer_size & (blksz - 1))
                return EFI_BAD_BUFFER_SIZE;
 
-#if CONFIG_IS_ENABLED(PARTITIONS)
-       if (direction == EFI_DISK_READ)
-               n = dev_read(diskobj->dev, lba, blocks, buffer);
-       else
-               n = dev_write(diskobj->dev, lba, blocks, buffer);
-#else
-       /* dev is always a block device (UCLASS_BLK) */
-       struct blk_desc *desc;
+       if (CONFIG_IS_ENABLED(PARTITIONS) &&
+           device_get_uclass_id(diskobj->dev) == UCLASS_PARTITION) {
+               if (direction == EFI_DISK_READ)
+                       n = dev_read(diskobj->dev, lba, blocks, buffer);
+               else
+                       n = dev_write(diskobj->dev, lba, blocks, buffer);
+       } else {
+               /* dev is a block device (UCLASS_BLK) */
+               struct blk_desc *desc;
 
-       desc = dev_get_uclass_plat(diskobj->dev);
-       if (direction == EFI_DISK_READ)
-               n = blk_dread(desc, lba, blocks, buffer);
-       else
-               n = blk_dwrite(desc, lba, blocks, buffer);
-#endif
+               desc = dev_get_uclass_plat(diskobj->dev);
+               if (direction == EFI_DISK_READ)
+                       n = blk_dread(desc, lba, blocks, buffer);
+               else
+                       n = blk_dwrite(desc, lba, blocks, buffer);
+       }
 
        /* We don't do interrupts, so check for timers cooperatively */
        efi_timer_check();