dm: core: Correct the return value for uclass_find_first_device()

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@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index af575bb..f217876 100644 (file)
--- 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 6977995..6e3f15c 100644 (file)
--- 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 edd55b0..f74c430 100644 (file)
--- 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;