kevin/linux
1
Fork 0
Code

of: Always unflatten in unflatten_and_copy_device_tree()

Browse Source 
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>
Link: https://lore.kernel.org/r/20240217010557.2381548-2-sboyd@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Stephen Boyd 2024-02-16 17:05:50 -08:00 committed by Rob Herring
parent 5d3d723470
commit dc1460fe1b
1 changed files with 17 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/of/fdt.c
View File

@ -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();
}