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From acb49b81500dd9d65027587767db25ead0b457af Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Thu, 14 Jun 2018 15:07:26 +0100
Subject: [PATCH] of: configfs: Use of_overlay_fdt_apply API call
The published API to the dynamic overlay application mechanism now
takes a Flattened Device Tree blob as input so that it can manage the
lifetime of the unflattened tree. Conveniently, the new API call -
of_overlay_fdt_apply - is virtually a drop-in replacement for
create_overlay, which can now be deleted.
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
drivers/of/configfs.c | 47 +++++++------------------------------------
1 file changed, 7 insertions(+), 40 deletions(-)
--- a/drivers/of/configfs.c
+++ b/drivers/of/configfs.c
@@ -40,41 +40,6 @@ struct cfs_overlay_item {
int dtbo_size;
};
-static int create_overlay(struct cfs_overlay_item *overlay, void *blob)
-{
- int err;
-
- /* unflatten the tree */
- of_fdt_unflatten_tree(blob, NULL, &overlay->overlay);
- if (overlay->overlay == NULL) {
- pr_err("%s: failed to unflatten tree\n", __func__);
- err = -EINVAL;
- goto out_err;
- }
- pr_debug("%s: unflattened OK\n", __func__);
-
- /* mark it as detached */
- of_node_set_flag(overlay->overlay, OF_DETACHED);
-
- /* perform resolution */
- err = of_resolve_phandles(overlay->overlay);
- if (err != 0) {
- pr_err("%s: Failed to resolve tree\n", __func__);
- goto out_err;
- }
- pr_debug("%s: resolved OK\n", __func__);
-
- err = of_overlay_apply(overlay->overlay, &overlay->ov_id);
- if (err < 0) {
- pr_err("%s: Failed to create overlay (err=%d)\n",
- __func__, err);
- goto out_err;
- }
-
-out_err:
- return err;
-}
-
static inline struct cfs_overlay_item *to_cfs_overlay_item(
struct config_item *item)
{
@@ -115,7 +80,8 @@ static ssize_t cfs_overlay_item_path_sto
if (err != 0)
goto out_err;
- err = create_overlay(overlay, (void *)overlay->fw->data);
+ err = of_overlay_fdt_apply((void *)overlay->fw->data,
+ (u32)overlay->fw->size, &overlay->ov_id);
if (err != 0)
goto out_err;
@@ -136,7 +102,7 @@ static ssize_t cfs_overlay_item_status_s
struct cfs_overlay_item *overlay = to_cfs_overlay_item(item);
return sprintf(page, "%s\n",
- overlay->ov_id >= 0 ? "applied" : "unapplied");
+ overlay->ov_id > 0 ? "applied" : "unapplied");
}
CONFIGFS_ATTR(cfs_overlay_item_, path);
@@ -188,7 +154,8 @@ ssize_t cfs_overlay_item_dtbo_write(stru
overlay->dtbo_size = count;
- err = create_overlay(overlay, overlay->dtbo);
+ err = of_overlay_fdt_apply(overlay->dtbo, overlay->dtbo_size,
+ &overlay->ov_id);
if (err != 0)
goto out_err;
@@ -198,6 +165,7 @@ out_err:
kfree(overlay->dtbo);
overlay->dtbo = NULL;
overlay->dtbo_size = 0;
+ overlay->ov_id = 0;
return err;
}
@@ -213,7 +181,7 @@ static void cfs_overlay_release(struct c
{
struct cfs_overlay_item *overlay = to_cfs_overlay_item(item);
- if (overlay->ov_id >= 0)
+ if (overlay->ov_id > 0)
of_overlay_remove(&overlay->ov_id);
if (overlay->fw)
release_firmware(overlay->fw);
@@ -241,7 +209,6 @@ static struct config_item *cfs_overlay_g
overlay = kzalloc(sizeof(*overlay), GFP_KERNEL);
if (!overlay)
return ERR_PTR(-ENOMEM);
- overlay->ov_id = -1;
config_item_init_type_name(&overlay->item, name, &cfs_overlay_type);
return &overlay->item;
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