arm64: check return value of of_flat_dt_get_machine_name

It's useless to print machine name and setup arch-specific system
identifiers if of_flat_dt_get_machine_name() return NULL, especially
when ACPI-based boot.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 2c822ef..d4b7405 100644 (file)
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -194,6 +194,9 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys)
        }
 
        name = of_flat_dt_get_machine_name();
+       if (!name)
+               return;
+
        pr_info("Machine model: %s\n", name);
        dump_stack_set_arch_desc("%s (DT)", name);
 }