dm: device: fail uclass_find_first_device() if list_empty

While uclass_find_device() fails with -ENODEV in case of list_empty
strangely uclass_find_first_device() returns 0.

Fix uclass_find_first_device() to also fail with -ENODEV instead.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index a622f07..fc3157d 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 0;
+               return -ENODEV;
 
        *devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);
 

diff --git a/test/dm/core.c b/test/dm/core.c
index 260f649..edd55b0 100644 (file)
--- a/test/dm/core.c
+++ b/test/dm/core.c
@@ -749,6 +749,10 @@ 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_assert(!dev);
+
        return 0;
 }
 DM_TEST(dm_test_uclass_devices_find, DM_TESTF_SCAN_PDATA);