[PATCH 1/3] partitions: efi: register guid device parameter for disk GUID

Ahmad Fatoum a.fatoum at pengutronix.de
Thu Jun 30 05:40:33 PDT 2022

We already register an nt_signature parameter for MBR partitions.
Register an equivalent guid parameter for GPT partitions as well.
This is less critical because disk GUID isn't used for root=
Linux boot argument computation, as each partition has its own
PARTUUID. It's still useful to allow shell scripts to check
against it to detect e.g. a factory flash image.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
 common/partitions/efi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/common/partitions/efi.c b/common/partitions/efi.c
index 848bed22610f..0f3f790539cd 100644
--- a/common/partitions/efi.c
+++ b/common/partitions/efi.c
@@ -446,6 +446,7 @@ static void efi_partition(void *buf, struct block_device *blk,
 	snprintf(blk->cdev.uuid, sizeof(blk->cdev.uuid), "%pUl", &gpt->disk_guid);
+	dev_add_param_string_fixed(blk->dev, "guid", blk->cdev.uuid);
 	nb_part = le32_to_cpu(gpt->num_partition_entries);

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