[PATCH 6.6 143/676] um: Unconditionally call unflatten_device_tree()

[Greg Kroah-Hartman]

6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stephen Boyd <sboyd at kernel.org>

[ Upstream commit 221a819aa3ca5bbbc91ce425b3e8d9463b121d09 ]

Call this function unconditionally so that we can populate an empty DTB
on platforms that don't boot with a command line provided DTB.  There's
no harm in calling unflatten_device_tree() unconditionally. If there
isn't a valid initial_boot_params dtb then unflatten_device_tree()
returns early.

Cc: Rob Herring <robh+dt at kernel.org>
Cc: Frank Rowand <frowand.list at gmail.com>
Cc: Richard Weinberger <richard at nod.at>
Cc: Anton Ivanov <anton.ivanov at cambridgegreys.com>
Cc: Johannes Berg <johannes at sipsolutions.net>
Cc: linux-um at lists.infradead.org
Signed-off-by: Stephen Boyd <sboyd at kernel.org>
Link: https://lore.kernel.org/r/20240217010557.2381548-4-sboyd@kernel.org
Signed-off-by: Rob Herring <robh at kernel.org>
Stable-dep-of: b2473a359763 ("of/fdt: add dt_phys arg to early_init_dt_scan and early_init_dt_verify")
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 arch/um/kernel/dtb.c  | 16 ++++++++--------
 drivers/of/unittest.c |  4 ----
 2 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/arch/um/kernel/dtb.c b/arch/um/kernel/dtb.c
index 484141b06938f..4954188a6a090 100644
--- a/arch/um/kernel/dtb.c
+++ b/arch/um/kernel/dtb.c
@@ -16,16 +16,16 @@ void uml_dtb_init(void)
 	void *area;
 
 	area = uml_load_file(dtb, &size);
-	if (!area)
-		return;
-
-	if (!early_init_dt_scan(area)) {
-		pr_err("invalid DTB %s\n", dtb);
-		memblock_free(area, size);
-		return;
+	if (area) {
+		if (!early_init_dt_scan(area)) {
+			pr_err("invalid DTB %s\n", dtb);
+			memblock_free(area, size);
+			return;
+		}
+
+		early_init_fdt_scan_reserved_mem();
 	}
 
-	early_init_fdt_scan_reserved_mem();
 	unflatten_device_tree();
 }
 
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 4f58345b5c683..7986113adc7d3 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -4017,10 +4017,6 @@ static int __init of_unittest(void)
 	add_taint(TAINT_TEST, LOCKDEP_STILL_OK);
 
 	/* adding data for unittest */
-
-	if (IS_ENABLED(CONFIG_UML))
-		unittest_unflatten_overlay_base();
-
 	res = unittest_data_add();
 	if (res)
 		return res;
-- 
2.43.0