linux-kernel - [PATCH v2 5/6] of: dynamic: Move dead property list check into property add/update functions

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Message-Id: <20230801-dt-changeset-fixes-v2-5-c2b701579dee@kernel.org>
Date:   Fri, 04 Aug 2023 16:41:55 -0600
From:   Rob Herring <robh@...nel.org>
To:     Frank Rowand <frowand.list@...il.com>,
        "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/6] of: dynamic: Move dead property list check into
 property add/update functions

The changeset code checks for a property in the deadprops list when
adding/updating a property, but of_add_property() and
of_update_property() do not. As the users of these functions are pretty
simple, they have not hit this scenario or else the property lists
would get corrupted.

Signed-off-by: Rob Herring <robh@...nel.org>
---
v2:
 - Add helper to remove property from deadprops list
---
 drivers/of/base.c    | 19 +++++++++++++++++++
 drivers/of/dynamic.c | 19 -------------------
 2 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index e235f3a57ea8..c63a4cde281e 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1530,6 +1530,21 @@ int of_count_phandle_with_args(const struct device_node *np, const char *list_na
 }
 EXPORT_SYMBOL(of_count_phandle_with_args);
 
+static void __of_remove_dead_property(struct device_node *np, struct property *prop)
+{
+	struct property **next;
+
+	/* If the property is in deadprops then it must be removed */
+	for (next = &np->deadprops; *next; next = &(*next)->next) {
+		if (*next != prop)
+			continue;
+
+		*next = prop->next;
+		prop->next = NULL;
+		break;
+	}
+}
+
 /**
  * __of_add_property - Add a property to a node without lock operations
  * @np:		Caller's Device Node
@@ -1539,6 +1554,8 @@ int __of_add_property(struct device_node *np, struct property *prop)
 {
 	struct property **next;
 
+	__of_remove_dead_property(np, prop);
+
 	prop->next = NULL;
 	next = &np->properties;
 	while (*next) {
@@ -1641,6 +1658,8 @@ int __of_update_property(struct device_node *np, struct property *newprop,
 {
 	struct property **next, *oldprop;
 
+	__of_remove_dead_property(np, newprop);
+
 	for (next = &np->properties; *next; next = &(*next)->next) {
 		if (of_prop_cmp((*next)->name, newprop->name) == 0)
 			break;
diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index fbc7c29896a2..769869e8b847 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -563,7 +563,6 @@ static int __of_changeset_entry_notify(struct of_changeset_entry *ce,
 
 static int __of_changeset_entry_apply(struct of_changeset_entry *ce)
 {
-	struct property **propp;
 	unsigned long flags;
 	int ret = 0;
 
@@ -578,15 +577,6 @@ static int __of_changeset_entry_apply(struct of_changeset_entry *ce)
 		__of_detach_node(ce->np);
 		break;
 	case OF_RECONFIG_ADD_PROPERTY:
-		/* If the property is in deadprops then it must be removed */
-		for (propp = &ce->np->deadprops; *propp; propp = &(*propp)->next) {
-			if (*propp == ce->prop) {
-				*propp = ce->prop->next;
-				ce->prop->next = NULL;
-				break;
-			}
-		}
-
 		ret = __of_add_property(ce->np, ce->prop);
 		break;
 	case OF_RECONFIG_REMOVE_PROPERTY:
@@ -594,15 +584,6 @@ static int __of_changeset_entry_apply(struct of_changeset_entry *ce)
 		break;
 
 	case OF_RECONFIG_UPDATE_PROPERTY:
-		/* If the property is in deadprops then it must be removed */
-		for (propp = &ce->np->deadprops; *propp; propp = &(*propp)->next) {
-			if (*propp == ce->prop) {
-				*propp = ce->prop->next;
-				ce->prop->next = NULL;
-				break;
-			}
-		}
-
 		ret = __of_update_property(ce->np, ce->prop, &ce->old_prop);
 		break;
 	default:

-- 
2.40.1