cpufreq/amd-pstate: Move registration after static function call update

On shared memory designs the static functions need to work before
registration is done or the system can hang at bootup.

Move the registration later in amd_pstate_init() to solve this.

Fixes: b427ac4 ("cpufreq/amd-pstate: Remove the redundant amd_pstate_set_driver() call")
Reported-by: Klara Modin <[email protected]>
Closes: https://lore.kernel.org/linux-pm/[email protected]/#t
Tested-by: Klara Modin <[email protected]>
Tested-by: Dhananjay Ugwekar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mario Limonciello <[email protected]>

Author: superm1

drivers/cpufreq/amd-pstate.c

@@ -1859,12 +1859,6 @@ static int __init amd_pstate_init(void)
 		return -ENODEV;
 	}
 
-	ret = amd_pstate_register_driver(cppc_state);
-	if (ret) {
-		pr_err("failed to register with return %d\n", ret);
-		return ret;
-	}
-
 	/* capability check */
 	if (cpu_feature_enabled(X86_FEATURE_CPPC)) {
 		pr_debug("AMD CPPC MSR based functionality is supported\n");
@@ -1875,6 +1869,12 @@ static int __init amd_pstate_init(void)
 		static_call_update(amd_pstate_update_perf, shmem_update_perf);
 	}
 
+	ret = amd_pstate_register_driver(cppc_state);
+	if (ret) {
+		pr_err("failed to register with return %d\n", ret);
+		return ret;
+	}
+
 	if (amd_pstate_prefcore) {
 		ret = amd_detect_prefcore(&amd_pstate_prefcore);
 		if (ret)