linux-kernel - [PATCH 2/2] of: unittest: treat missing of

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Message-Id: <20220624034327.2542112-3-frowand.list@gmail.com>
Date:   Thu, 23 Jun 2022 22:43:27 -0500
From:   frowand.list@...il.com
To:     Rob Herring <robh+dt@...nel.org>,
        Clément Léger <clement.leger@...tlin.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lizhi Hou <lizhi.hou@...inx.com>,
        Allan Nielsen <allan.nielsen@...rochip.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Steen Hegelund <steen.hegelund@...rochip.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: [PATCH 2/2]  of: unittest: treat missing of_root as error instead of fixing up

From: Frank Rowand <frank.rowand@...y.com>

 setup_of() now ensures that of_root node is populated with the
 root of a default devicetree. Remove the unittest code that
 created of_root if it was missing.  Verify that of_root is
 valid before attempting to attach the testcase-data subtree.

Signed-off-by: Frank Rowand <frank.rowand@...y.com>
---
 drivers/of/unittest.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 7f6bba18c515..9d106998c1f2 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -1469,20 +1469,16 @@ static int __init unittest_data_add(void)
 		return -EINVAL;
 	}
 
-	if (!of_root) {
-		of_root = unittest_data_node;
-		for_each_of_allnodes(np)
-			__of_attach_node_sysfs(np);
-		of_aliases = of_find_node_by_path("/aliases");
-		of_chosen = of_find_node_by_path("/chosen");
-		of_overlay_mutex_unlock();
-		return 0;
-	}
-
 	EXPECT_BEGIN(KERN_INFO,
 		     "Duplicate name in testcase-data, renamed to \"duplicate-name#1\"");
 
 	/* attach the sub-tree to live tree */
+	if (!of_root) {
+		pr_warn("%s: no live tree to attach sub-tree\n", __func__);
+		kfree(unittest_data);
+		return -ENODEV;
+	}
+
 	np = unittest_data_node->child;
 	while (np) {
 		struct device_node *next = np->sibling;
-- 
Frank Rowand <frank.rowand@...y.com>