[U-Boot] [PATCH 011/126] dm: core: Correct the return value for uclass_find_first_device()

[Simon Glass]

This function returns -ENODEV when there is no device. This is
inconsistent with other functions, such as uclass_find_next_device(),
which returns 0.

Update it and tidy up the incorrect '-1' values in the comments.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 drivers/core/uclass.c        | 2 +-
 include/dm/uclass-internal.h | 4 ++--
 test/dm/core.c               | 3 +--
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index af575bbeb72..f217876cd2c 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -225,7 +225,7 @@ int uclass_find_first_device(enum uclass_id id, struct udevice **devp)
 	if (ret)
 		return ret;
 	if (list_empty(&uc->dev_head))
-		return -ENODEV;
+		return 0;
 
 	*devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);
 
diff --git a/include/dm/uclass-internal.h b/include/dm/uclass-internal.h
index 6977995246d..6e3f15c2b08 100644
--- a/include/dm/uclass-internal.h
+++ b/include/dm/uclass-internal.h
@@ -69,7 +69,7 @@ int uclass_find_device(enum uclass_id id, int index, struct udevice **devp);
  * The device is not prepared for use - this is an internal function.
  * The function uclass_get_device_tail() can be used to probe the device.
  *
- * @return 0 if OK (found or not found), -1 on error
+ * @return 0 if OK (found or not found), -ve on error
  */
 int uclass_find_first_device(enum uclass_id id, struct udevice **devp);
 
@@ -81,7 +81,7 @@ int uclass_find_first_device(enum uclass_id id, struct udevice **devp);
  * The device is not prepared for use - this is an internal function.
  * The function uclass_get_device_tail() can be used to probe the device.
  *
- * @return 0 if OK (found or not found), -1 on error
+ * @return 0 if OK (found or not found), -ve on error
  */
 int uclass_find_next_device(struct udevice **devp);
 
diff --git a/test/dm/core.c b/test/dm/core.c
index edd55b05d6e..f74c4308439 100644
--- a/test/dm/core.c
+++ b/test/dm/core.c
@@ -749,8 +749,7 @@ static int dm_test_uclass_devices_find(struct unit_test_state *uts)
 		ut_assert(dev);
 	}
 
-	ret = uclass_find_first_device(UCLASS_TEST_DUMMY, &dev);
-	ut_assert(ret == -ENODEV);
+	ut_assertok(uclass_find_first_device(UCLASS_TEST_DUMMY, &dev));
 	ut_assert(!dev);
 
 	return 0;
-- 
2.23.0.444.g18eeb5a265-goog