[U-Boot] [PATCH v2 17/29] dtoc: Fix Fdt.GetNode() to handle a missing node

[Simon Glass]

At present the algortihm is not correct since it will return the root node
if the requested node is not found and there are no slashes in the
requested node name. Fix this and add a test.

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

Changes in v2: None

 tools/dtoc/fdt.py      | 5 ++++-
 tools/dtoc/test_fdt.py | 3 +++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/dtoc/fdt.py b/tools/dtoc/fdt.py
index 274c142e7a..c1d04d48e8 100644
--- a/tools/dtoc/fdt.py
+++ b/tools/dtoc/fdt.py
@@ -318,7 +318,10 @@ class Fdt:
             Node object, or None if not found
         """
         node = self._root
-        for part in path.split('/')[1:]:
+        parts = path.split('/')
+        if len(parts) < 2:
+            return None
+        for part in parts[1:]:
             node = node._FindNode(part)
             if not node:
                 return None
diff --git a/tools/dtoc/test_fdt.py b/tools/dtoc/test_fdt.py
index e57298dbe7..9fef8ed549 100755
--- a/tools/dtoc/test_fdt.py
+++ b/tools/dtoc/test_fdt.py
@@ -205,6 +205,9 @@ class TestProp(unittest.TestCase):
         self.node = self.dtb.GetNode('/spl-test')
         self.fdt = self.dtb.GetFdtObj()
 
+    def testMissingNode(self):
+        self.assertEqual(None, self.dtb.GetNode('missing'))
+
     def testPhandle(self):
         dtb = fdt.FdtScan('tools/dtoc/dtoc_test_phandle.dts')
         node = dtb.GetNode('/phandle-source')
-- 
2.18.0.203.gfac676dfb9-goog