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From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Subject: [PATCH 02/18] of: Add function to duplicate a device tree
Date: Thu, 24 Jun 2021 10:52:07 +0200	[thread overview]
Message-ID: <20210624085223.14616-3-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20210624085223.14616-1-s.hauer@pengutronix.de>

This adds of_dup() to duplicate a device tree. Previously of_copy_node()
was used for this, but of_copy_node() has issues with potentially
duplicated phandle values when the new tree is inserted to an existing
tree, that is when the parent argument of of_copy_node() is non NULL.
All users of of_copy_node() with a NULL parent argument are converted
to of_dup() which is safe to use leaving only the problematic users
of of_copy_node().

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 commands/of_diff.c | 4 ++--
 common/oftree.c    | 2 +-
 drivers/of/base.c  | 5 +++++
 include/of.h       | 1 +
 4 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/commands/of_diff.c b/commands/of_diff.c
index ec039776cf..d9d84fd4bf 100644
--- a/commands/of_diff.c
+++ b/commands/of_diff.c
@@ -25,7 +25,7 @@ static struct device_node *get_tree(const char *filename, struct device_node *ro
 		if (!node)
 			return ERR_PTR(-ENOENT);
 
-		return of_copy_node(NULL, node);
+		return of_dup(node);
 	}
 
 	if (!strcmp(filename, "+")) {
@@ -33,7 +33,7 @@ static struct device_node *get_tree(const char *filename, struct device_node *ro
 		if (!node)
 			return ERR_PTR(-ENOENT);
 
-		node = of_copy_node(NULL, root);
+		node = of_dup(root);
 
 		of_fix_tree(node);
 
diff --git a/common/oftree.c b/common/oftree.c
index 5eaa63ad7e..da8043809b 100644
--- a/common/oftree.c
+++ b/common/oftree.c
@@ -353,7 +353,7 @@ struct fdt_header *of_get_fixed_tree(struct device_node *node)
 		if (!node)
 			return NULL;
 
-		freenp = node = of_copy_node(NULL, node);
+		freenp = node = of_dup(node);
 		if (!node)
 			return NULL;
 	}
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 1434f39ad1..5d93750aec 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2420,6 +2420,11 @@ struct device_node *of_copy_node(struct device_node *parent, const struct device
 	return np;
 }
 
+struct device_node *of_dup(const struct device_node *root)
+{
+	return of_copy_node(NULL, root);
+}
+
 void of_delete_node(struct device_node *node)
 {
 	struct device_node *n, *nt;
diff --git a/include/of.h b/include/of.h
index d67a40bd19..94eb71190d 100644
--- a/include/of.h
+++ b/include/of.h
@@ -162,6 +162,7 @@ extern struct device_node *of_create_node(struct device_node *root,
 					const char *path);
 extern struct device_node *of_copy_node(struct device_node *parent,
 				const struct device_node *other);
+extern struct device_node *of_dup(const struct device_node *root);
 extern void of_delete_node(struct device_node *node);
 
 extern const char *of_get_machine_compatible(void);
-- 
2.29.2


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  parent reply	other threads:[~2021-06-24  8:54 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-24  8:52 [PATCH v3 00/18] Apply device tree overlays to kernel tree Sascha Hauer
2021-06-24  8:52 ` [PATCH 01/18] of: of_copy_node(): Copy phandles as well Sascha Hauer
2021-06-24  8:52 ` Sascha Hauer [this message]
2021-06-24  8:52 ` [PATCH 03/18] fdt: Check blob size during unflattening Sascha Hauer
2021-06-24  8:52 ` [PATCH 04/18] firmware: make device_node argument non const Sascha Hauer
2021-06-24  8:52 ` [PATCH 05/18] libbb: Add find_path function Sascha Hauer
2021-06-24  8:52 ` [PATCH 06/18] firmware: consolidate ifdefs Sascha Hauer
2021-06-24  8:52 ` [PATCH 07/18] firmware: Add search path Sascha Hauer
2021-06-24  8:52 ` [PATCH 08/18] firmware: Fix device_node matching Sascha Hauer
2021-06-24  8:52 ` [PATCH 09/18] firmware: recognize by reproducible name Sascha Hauer
2021-06-24  8:52 ` [PATCH 10/18] blspec: Set firmware searchpath Sascha Hauer
2021-06-24  8:52 ` [PATCH 11/18] overlay: Add of_overlay_apply_file() Sascha Hauer
2021-06-24  8:52 ` [PATCH 12/18] firmware: Load from global search path Sascha Hauer
2021-06-24  8:52 ` [PATCH 13/18] blspec: Rework firmware load Sascha Hauer
2021-06-24  8:52 ` [PATCH 14/18] overlay: Add filters to choose which overlays to apply Sascha Hauer
2021-06-28 18:58   ` Michael Riesch
2021-06-28 20:13     ` Sascha Hauer
2021-06-24  8:52 ` [PATCH 15/18] blspec: Apply overlays from rootfs Sascha Hauer
2021-06-24  8:52 ` [PATCH 16/18] doc: devicetree: Refer to internal device tree also as live tree Sascha Hauer
2021-06-24  8:52 ` [PATCH 17/18] Documentation: Add documentation for device tree overlays Sascha Hauer
2021-06-24  8:52 ` [PATCH 18/18] of_firmware: Fix handling of firmware-name property Sascha Hauer

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