[PATCH] arm64: skip register_cpufreq_notifier on ACPI-based systems

[pprakash@codeaurora.org (Prashanth Prakash)]

On ACPI based systems where the topology is setup using the API
store_cpu_topology, at the moment we do not have necessary code
to handle a cpufreq notifier, thus resulting in a crash.

Skip register_cpufreq_notifier if raw_capacity is not allocated
as part of topology initialization.

Stack:
        init_cpu_capacity_callback+0xb4/0x1c8
        notifier_call_chain+0x5c/0xa0
        __blocking_notifier_call_chain+0x58/0xa0
        blocking_notifier_call_chain+0x3c/0x50
        cpufreq_set_policy+0xe4/0x328
        cpufreq_init_policy+0x80/0x100
        cpufreq_online+0x418/0x710
        cpufreq_add_dev+0x118/0x180
        subsys_interface_register+0xa4/0xf8
        cpufreq_register_driver+0x1c0/0x298
        cppc_cpufreq_init+0xdc/0x1000 [cppc_cpufreq]
        do_one_initcall+0x5c/0x168
        do_init_module+0x64/0x1e4
        load_module+0x130c/0x14d0
        SyS_finit_module+0x108/0x120
        el0_svc_naked+0x24/0x28

Patch that added support for popultaing cpu capacity for DT:
https://patchwork.codeaurora.org/patch/98353/

Signed-off-by: Prashanth Prakash <pprakash@codeaurora.org>
---
 arch/arm64/kernel/topology.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index 23e9e13..3f175ce 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -209,7 +209,7 @@ static void normalize_cpu_capacity(void)
 
 static int __init register_cpufreq_notifier(void)
 {
-	if (cap_parsing_failed)
+	if (cap_parsing_failed || !raw_capacity)
 		return -EINVAL;
 
 	if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL)) {
-- 
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