Merge tag 'acpi-6.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "These fix the handling of dependencies between devices in the ACPI
  device enumeration code and address a _UID matching regression from
  the 6.8 development cycle.

  Specifics:

   - Modify the ACPI device enumeration code to avoid counting
     dependencies that have been met already as unmet (Hans de Goede)

   - Make _UID matching take the integer value of 0 into account as
     appropriate (Raag Jadav)"

* tag 'acpi-6.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: bus: allow _UID matching for integer zero
  ACPI: scan: Do not increase dep_unmet for already met dependencies

2 files changed, 7 insertions, 4 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 7c157bf92695..d1464324de95 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1843,7 +1843,8 @@ static void acpi_scan_dep_init(struct acpi_device *adev)
 			if (dep->honor_dep)
 				adev->flags.honor_deps = 1;
 
-			adev->dep_unmet++;
+			if (!dep->met)
+				adev->dep_unmet++;
 		}
 	}
 }
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 5de954e2b18a..e7796f373d0d 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -911,17 +911,19 @@ static inline bool acpi_int_uid_match(struct acpi_device *adev, u64 uid2)
  * acpi_dev_hid_uid_match - Match device by supplied HID and UID
  * @adev: ACPI device to match.
  * @hid2: Hardware ID of the device.
- * @uid2: Unique ID of the device, pass 0 or NULL to not check _UID.
+ * @uid2: Unique ID of the device, pass NULL to not check _UID.
  *
  * Matches HID and UID in @adev with given @hid2 and @uid2. Absence of @uid2
  * will be treated as a match. If user wants to validate @uid2, it should be
  * done before calling this function.
  *
- * Returns: %true if matches or @uid2 is 0 or NULL, %false otherwise.
+ * Returns: %true if matches or @uid2 is NULL, %false otherwise.
  */
 #define acpi_dev_hid_uid_match(adev, hid2, uid2)			\
 	(acpi_dev_hid_match(adev, hid2) &&				\
-		(!(uid2) || acpi_dev_uid_match(adev, uid2)))
+		/* Distinguish integer 0 from NULL @uid2 */		\
+		(_Generic(uid2,	ACPI_STR_TYPES(!(uid2)), default: 0) ||	\
+		acpi_dev_uid_match(adev, uid2)))
 
 void acpi_dev_clear_dependencies(struct acpi_device *supplier);
 bool acpi_dev_ready_for_enumeration(const struct acpi_device *device);