Patch "of: overlay: Extend of_overlay_fdt_apply() to specify the target node" has been added to the 6.5-stable tree

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This is a note to let you know that I've just added the patch titled

    of: overlay: Extend of_overlay_fdt_apply() to specify the target node

to the 6.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     of-overlay-extend-of_overlay_fdt_apply-to-specify-th.patch
and it can be found in the queue-6.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit f379b0f4937323cbd8bfc85811fb3e68ecfd64a0
Author: Lizhi Hou <lizhi.hou@xxxxxxx>
Date:   Tue Aug 15 10:19:59 2023 -0700

    of: overlay: Extend of_overlay_fdt_apply() to specify the target node
    
    [ Upstream commit 47284862bfc7fd5672e731e827f43f26bdbd155c ]
    
    Currently, in an overlay fdt fragment, it needs to specify the exact
    location in base DT. In another word, when the fdt fragment is generated,
    the base DT location for the fragment is already known.
    
    There is new use case that the base DT location is unknown when fdt
    fragment is generated. For example, the add-on device provide a fdt
    overlay with its firmware to describe its downstream devices. Because it
    is add-on device which can be plugged to different systems, its firmware
    will not be able to know the overlay location in base DT. Instead, the
    device driver will load the overlay fdt and apply it to base DT at runtime.
    In this case, of_overlay_fdt_apply() needs to be extended to specify
    the target node for device driver to apply overlay fdt.
        int overlay_fdt_apply(..., struct device_node *base);
    
    Signed-off-by: Lizhi Hou <lizhi.hou@xxxxxxx>
    Link: https://lore.kernel.org/r/1692120000-46900-5-git-send-email-lizhi.hou@xxxxxxx
    Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
    Stable-dep-of: c9260693aa0c ("PCI: Lengthen reset delay for VideoPropulsion Torrent QN16e card")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 28b479afd506f..dfb6fb962fc70 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -682,9 +682,11 @@ static int build_changeset(struct overlay_changeset *ovcs)
  * 1) "target" property containing the phandle of the target
  * 2) "target-path" property containing the path of the target
  */
-static struct device_node *find_target(struct device_node *info_node)
+static struct device_node *find_target(struct device_node *info_node,
+				       struct device_node *target_base)
 {
 	struct device_node *node;
+	char *target_path;
 	const char *path;
 	u32 val;
 	int ret;
@@ -700,10 +702,23 @@ static struct device_node *find_target(struct device_node *info_node)
 
 	ret = of_property_read_string(info_node, "target-path", &path);
 	if (!ret) {
-		node =  of_find_node_by_path(path);
-		if (!node)
-			pr_err("find target, node: %pOF, path '%s' not found\n",
-			       info_node, path);
+		if (target_base) {
+			target_path = kasprintf(GFP_KERNEL, "%pOF%s", target_base, path);
+			if (!target_path)
+				return NULL;
+			node = of_find_node_by_path(target_path);
+			if (!node) {
+				pr_err("find target, node: %pOF, path '%s' not found\n",
+				       info_node, target_path);
+			}
+			kfree(target_path);
+		} else {
+			node =  of_find_node_by_path(path);
+			if (!node) {
+				pr_err("find target, node: %pOF, path '%s' not found\n",
+				       info_node, path);
+			}
+		}
 		return node;
 	}
 
@@ -715,6 +730,7 @@ static struct device_node *find_target(struct device_node *info_node)
 /**
  * init_overlay_changeset() - initialize overlay changeset from overlay tree
  * @ovcs:		Overlay changeset to build
+ * @target_base:	Point to the target node to apply overlay
  *
  * Initialize @ovcs.  Populate @ovcs->fragments with node information from
  * the top level of @overlay_root.  The relevant top level nodes are the
@@ -725,7 +741,8 @@ static struct device_node *find_target(struct device_node *info_node)
  * detected in @overlay_root.  On error return, the caller of
  * init_overlay_changeset() must call free_overlay_changeset().
  */
-static int init_overlay_changeset(struct overlay_changeset *ovcs)
+static int init_overlay_changeset(struct overlay_changeset *ovcs,
+				  struct device_node *target_base)
 {
 	struct device_node *node, *overlay_node;
 	struct fragment *fragment;
@@ -784,7 +801,7 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs)
 
 		fragment = &fragments[cnt];
 		fragment->overlay = overlay_node;
-		fragment->target = find_target(node);
+		fragment->target = find_target(node, target_base);
 		if (!fragment->target) {
 			of_node_put(fragment->overlay);
 			ret = -EINVAL;
@@ -875,6 +892,7 @@ static void free_overlay_changeset(struct overlay_changeset *ovcs)
  *
  * of_overlay_apply() - Create and apply an overlay changeset
  * @ovcs:	overlay changeset
+ * @base:	point to the target node to apply overlay
  *
  * Creates and applies an overlay changeset.
  *
@@ -898,7 +916,8 @@ static void free_overlay_changeset(struct overlay_changeset *ovcs)
  * the caller of of_overlay_apply() must call free_overlay_changeset().
  */
 
-static int of_overlay_apply(struct overlay_changeset *ovcs)
+static int of_overlay_apply(struct overlay_changeset *ovcs,
+			    struct device_node *base)
 {
 	int ret = 0, ret_revert, ret_tmp;
 
@@ -906,7 +925,7 @@ static int of_overlay_apply(struct overlay_changeset *ovcs)
 	if (ret)
 		goto out;
 
-	ret = init_overlay_changeset(ovcs);
+	ret = init_overlay_changeset(ovcs, base);
 	if (ret)
 		goto out;
 
@@ -950,6 +969,7 @@ static int of_overlay_apply(struct overlay_changeset *ovcs)
  * @overlay_fdt:	pointer to overlay FDT
  * @overlay_fdt_size:	number of bytes in @overlay_fdt
  * @ret_ovcs_id:	pointer for returning created changeset id
+ * @base:		pointer for the target node to apply overlay
  *
  * Creates and applies an overlay changeset.
  *
@@ -965,7 +985,7 @@ static int of_overlay_apply(struct overlay_changeset *ovcs)
  */
 
 int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
-			 int *ret_ovcs_id)
+			 int *ret_ovcs_id, struct device_node *base)
 {
 	void *new_fdt;
 	void *new_fdt_align;
@@ -1036,7 +1056,7 @@ int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
 	}
 	ovcs->overlay_mem = overlay_mem;
 
-	ret = of_overlay_apply(ovcs);
+	ret = of_overlay_apply(ovcs, base);
 	/*
 	 * If of_overlay_apply() error, calling free_overlay_changeset() may
 	 * result in a memory leak if the apply partly succeeded, so do NOT
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 68e58b085c3db..c812a0175d1d3 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -3480,7 +3480,8 @@ static int __init overlay_data_apply(const char *overlay_name, int *ovcs_id)
 	if (!size)
 		pr_err("no overlay data for %s\n", overlay_name);
 
-	ret = of_overlay_fdt_apply(info->dtbo_begin, size, &info->ovcs_id);
+	ret = of_overlay_fdt_apply(info->dtbo_begin, size, &info->ovcs_id,
+				   NULL);
 	if (ovcs_id)
 		*ovcs_id = info->ovcs_id;
 	if (ret < 0)
diff --git a/include/linux/of.h b/include/linux/of.h
index 9b82a6b0f3f55..722140b2e8abd 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1668,7 +1668,7 @@ struct of_overlay_notify_data {
 #ifdef CONFIG_OF_OVERLAY
 
 int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
-			 int *ovcs_id);
+			 int *ovcs_id, struct device_node *target_base);
 int of_overlay_remove(int *ovcs_id);
 int of_overlay_remove_all(void);
 



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