[PATCH v3 8/8] efi/dev-path-parser: Refactor _UID handling to use acpi_dev_uid_to_integer()

[Andy Shevchenko]

ACPI utils provide acpi_dev_uid_to_integer() helper to extract _UID as
an integer. Use it instead of custom approach.

Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede at redhat.com>
Reviewed-by: Ard Biesheuvel <ardb at kernel.org>
---
 drivers/firmware/efi/dev-path-parser.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/firmware/efi/dev-path-parser.c b/drivers/firmware/efi/dev-path-parser.c
index eb9c65f97841..f80d87c199c3 100644
--- a/drivers/firmware/efi/dev-path-parser.c
+++ b/drivers/firmware/efi/dev-path-parser.c
@@ -15,9 +15,11 @@
 static long __init parse_acpi_path(const struct efi_dev_path *node,
 				   struct device *parent, struct device **child)
 {
-	char hid[ACPI_ID_LEN], uid[11]; /* UINT_MAX + null byte */
 	struct acpi_device *adev;
 	struct device *phys_dev;
+	char hid[ACPI_ID_LEN];
+	u64 uid;
+	int ret;
 
 	if (node->header.length != 12)
 		return -EINVAL;
@@ -27,12 +29,12 @@ static long __init parse_acpi_path(const struct efi_dev_path *node,
 		'A' + ((node->acpi.hid >>  5) & 0x1f) - 1,
 		'A' + ((node->acpi.hid >>  0) & 0x1f) - 1,
 			node->acpi.hid >> 16);
-	sprintf(uid, "%u", node->acpi.uid);
 
 	for_each_acpi_dev_match(adev, hid, NULL, -1) {
-		if (adev->pnp.unique_id && !strcmp(adev->pnp.unique_id, uid))
+		ret = acpi_dev_uid_to_integer(adev, &uid);
+		if (ret == 0 && node->acpi.uid == uid)
 			break;
-		if (!adev->pnp.unique_id && node->acpi.uid == 0)
+		if (ret == -ENODATA && node->acpi.uid == 0)
 			break;
 	}
 	if (!adev)
-- 
2.35.1