linux-kernel - [PATCH 2/2] of: Implment cache update operation on device node attach

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Date: Tue, 30 Jan 2024 18:52:36 +0800
From: Dawei Li <dawei.li@...ngroup.cn>
To: robh+dt@...nel.org,
	frowand.list@...il.com
Cc: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	set_pte_at@...look.com,
	Dawei Li <dawei.li@...ngroup.cn>
Subject: [PATCH 2/2] of: Implment cache update operation on device node attach

Use implemented __of_phandle_update_cache to update phandle cache on
device node attachment.

While at it, make explicit assertion on locking dependency for
__of_phandle_cache_inv_entry.

Signed-off-by: Dawei Li <dawei.li@...ngroup.cn>
---
 drivers/of/base.c    | 6 ++++--
 drivers/of/dynamic.c | 2 ++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 8b7da27835eb..44e542b566e1 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -153,6 +153,8 @@ void __of_phandle_cache_inv_entry(phandle handle)
 	u32 handle_hash;
 	struct device_node *np;
 
+	lockdep_assert_held(&devtree_lock);
+
 	if (!handle)
 		return;
 
@@ -195,8 +197,8 @@ void __init of_core_init(void)
 	}
 	for_each_of_allnodes(np) {
 		__of_attach_node_sysfs(np);
-		if (np->phandle && !phandle_cache[of_phandle_cache_hash(np->phandle)])
-			phandle_cache[of_phandle_cache_hash(np->phandle)] = np;
+
+		__of_phandle_update_cache(np, false);
 	}
 	mutex_unlock(&of_mutex);
 
diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index 3bf27052832f..a68bf58f2c24 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -219,6 +219,8 @@ static void __of_attach_node(struct device_node *np)
 			np->phandle = 0;
 	}
 
+	__of_phandle_update_cache(np, true);
+
 	np->child = NULL;
 	np->sibling = np->parent->child;
 	np->parent->child = np;
-- 
2.27.0