[RFC PATCH 1/4] kho: Move subtree blob logic to separate function

[Logan Odell]

Move the logic to set the blob data in a subtree node into a separate
function to allow for re-use. No functional change.

Signed-off-by: Logan Odell <loganodell@xxxxxxxxxx>
---
 kernel/liveupdate/kexec_handover.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/kernel/liveupdate/kexec_handover.c b/kernel/liveupdate/kexec_handover.c
index cc68a3692905..29a05cec2625 100644
--- a/kernel/liveupdate/kexec_handover.c
+++ b/kernel/liveupdate/kexec_handover.c
@@ -722,6 +722,21 @@ static void __init kho_reserve_scratch(void)
 	kho_enable = false;
 }
 
+static int kho_add_subtree_node(const char *name, void *root_fdt, void *fdt, int off)
+{
+	int err;
+	phys_addr_t phys = virt_to_phys(fdt);
+
+	err = fdt_setprop(root_fdt, off, KHO_FDT_SUB_TREE_PROP_NAME,
+			  &phys, sizeof(phys));
+	if (err)
+		return err;
+
+	WARN_ON_ONCE(kho_debugfs_fdt_add(&kho_out.dbg, name, fdt, false));
+
+	return 0;
+}
+
 /**
  * kho_add_subtree - record the physical address of a sub FDT in KHO root tree.
  * @name: name of the sub tree.
@@ -739,7 +754,6 @@ static void __init kho_reserve_scratch(void)
  */
 int kho_add_subtree(const char *name, void *fdt)
 {
-	phys_addr_t phys = virt_to_phys(fdt);
 	void *root_fdt = kho_out.fdt;
 	int err = -ENOMEM;
 	int off, fdt_err;
@@ -757,12 +771,7 @@ int kho_add_subtree(const char *name, void *fdt)
 		goto out_pack;
 	}
 
-	err = fdt_setprop(root_fdt, off, KHO_FDT_SUB_TREE_PROP_NAME,
-			  &phys, sizeof(phys));
-	if (err < 0)
-		goto out_pack;
-
-	WARN_ON_ONCE(kho_debugfs_fdt_add(&kho_out.dbg, name, fdt, false));
+	err = kho_add_subtree_node(name, root_fdt, fdt, off);
 
 out_pack:
 	fdt_pack(root_fdt);
-- 
2.55.0.508.g3f0d502094-goog