@@ -1318,6 +1318,21 @@ bool __init early_init_dt_scan(void *params)
return true;
}
+static void *__init copy_device_tree(void *fdt)
+{
+ int size;
+ void *dt;
+
+ size = fdt_totalsize(fdt);
+ dt = early_init_dt_alloc_memory_arch(size,
+ roundup_pow_of_two(FDT_V17_SIZE));
+
+ if (dt)
+ memcpy(dt, fdt, size);
+
+ return dt;
+}
+
/**
* unflatten_device_tree - create tree of device_nodes from flat blob
*
@@ -1350,22 +1365,9 @@ void __init unflatten_device_tree(void)
*/
void __init unflatten_and_copy_device_tree(void)
{
- int size;
- void *dt;
+ if (initial_boot_params)
+ initial_boot_params = copy_device_tree(initial_boot_params);
- if (!initial_boot_params) {
- pr_warn("No valid device tree found, continuing without\n");
- return;
- }
-
- size = fdt_totalsize(initial_boot_params);
- dt = early_init_dt_alloc_memory_arch(size,
- roundup_pow_of_two(FDT_V17_SIZE));
-
- if (dt) {
- memcpy(dt, initial_boot_params, size);
- initial_boot_params = dt;
- }
unflatten_device_tree();
}
We want to populate an empty DT whenever CONFIG_OF is enabled so that overlays can be applied and the DT unit tests can be run. Make unflatten_and_copy_device_tree() stop printing a warning if the 'initial_boot_params' pointer is NULL. Instead, simply copy the dtb if there is one and then unflatten it. If there isn't a DT to copy, then the call to unflatten_device_tree() is largely a no-op, so nothing really changes here. Cc: Rob Herring <robh+dt@kernel.org> Cc: Frank Rowand <frowand.list@gmail.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org> --- drivers/of/fdt.c | 32 +++++++++++++++++--------------- 1 file changed, 17 insertions(+), 15 deletions(-)