From: Graeme Gregory <redacted>

If the early boot methods of acpi are happy that we have valid ACPI
tables and acpi=off has not been passed. Then do not unflat
devicetree effectively disabling further hardware probing from DT.

Signed-off-by: Graeme Gregory <redacted>
Signed-off-by: Hanjun Guo <redacted>
---
 arch/arm64/kernel/setup.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 5b05227..5796734 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c

@@ -398,7 +398,8 @@ void __init setup_arch(char **cmdline_p)
 	efi_idmap_init();
 
 	cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
-	unflatten_device_tree();
+	if (acpi_disabled)
+		unflatten_device_tree();
 
 	psci_init();
 

-- 
1.7.9.5