ARC: make a copy of flat DT
The flat DT (currently embedded in vmlinux) is in .init section.
The unflattened/binary tree doesn't copy strings through and references
them from orig flat DT - which could cause catestrohpy if of_* APIs are
called post init, say from a driver which is a loadable module.
Reported-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
diff --git a/arch/arc/kernel/devtree.c b/arch/arc/kernel/devtree.c
index a7d98b3..bdee3a8 100644
--- a/arch/arc/kernel/devtree.c
+++ b/arch/arc/kernel/devtree.c
@@ -106,3 +106,18 @@
return mdesc_best;
}
+
+/*
+ * Copy the flattened DT out of .init since unflattening doesn't copy strings
+ * and the normal DT APIs refs them from orig flat DT
+ */
+void __init copy_devtree(void)
+{
+ void *alloc = early_init_dt_alloc_memory_arch(
+ be32_to_cpu(initial_boot_params->totalsize), 64);
+ if (alloc) {
+ memcpy(alloc, initial_boot_params,
+ be32_to_cpu(initial_boot_params->totalsize));
+ initial_boot_params = alloc;
+ }
+}
diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index e591c6a..dc0f968 100644
--- a/arch/arc/kernel/setup.c
+++ b/arch/arc/kernel/setup.c
@@ -354,6 +354,8 @@
setup_arch_memory();
+ /* copy flat DT out of .init and then unflatten it */
+ copy_devtree();
unflatten_device_tree();
/* Can be issue if someone passes cmd line arg "ro"