From 832fb99da24ffe527e1ebd8363ea0d5a459dd594 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Wed, 30 Nov 2016 17:00:14 +0100
Subject: [PATCH] kernel: Add check to of_scan_flat_dt() before accessing
initial_boot_params
Fixes a bug that affects rt288x
Signed-off-by: Tobias Wolf <dev-NTEO@vplace.de>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
...of_scan_flat_dt-before-accessing-ini.patch | 30 +++++++++++++++++++
1 file changed, 30 insertions(+)
create mode 100644 target/linux/generic/patches-4.4/104-of-Add-check-to-of_scan_flat_dt-before-accessing-ini.patch
diff --git a/target/linux/generic/patches-4.4/104-of-Add-check-to-of_scan_flat_dt-before-accessing-ini.patch b/target/linux/generic/patches-4.4/104-of-Add-check-to-of_scan_flat_dt-before-accessing-ini.patch
new file mode 100644
index 0000000000..e7c125d8ec
--- /dev/null
+++ b/target/linux/generic/patches-4.4/104-of-Add-check-to-of_scan_flat_dt-before-accessing-ini.patch
@@ -0,0 +1,30 @@
+From: Tobias Wolf <dev-NTEO@vplace.de>
+Date: Wed, 23 Nov 2016 10:40:07 +0100
+Subject: [PATCH] of: Add check to of_scan_flat_dt() before accessing
+ initial_boot_params
+
+An empty __dtb_start to __dtb_end section might result in initial_boot_params
+being null for arch/mips/ralink. This showed that the boot process hangs
+indefinitely in of_scan_flat_dt().
+
+Signed-off-by: Tobias Wolf <dev-NTEO@vplace.de>
+---
+
+--- a/drivers/of/fdt.c
++++ b/drivers/of/fdt.c
+@@ -632,9 +632,12 @@ int __init of_scan_flat_dt(int (*it)(uns
+ const char *pathp;
+ int offset, rc = 0, depth = -1;
+
+- for (offset = fdt_next_node(blob, -1, &depth);
+- offset >= 0 && depth >= 0 && !rc;
+- offset = fdt_next_node(blob, offset, &depth)) {
++ if (!blob)
++ return 0;
++
++ for (offset = fdt_next_node(blob, -1, &depth);
++ offset >= 0 && depth >= 0 && !rc;
++ offset = fdt_next_node(blob, offset, &depth)) {
+
+ pathp = fdt_get_name(blob, offset, NULL);
+ if (*pathp == '/')
--
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