intel_pstate: Set CPU number before accessing MSRs

Ensure that cpu->cpu is set before writing MSR_IA32_PERF_CTL during CPU
initialization. Otherwise only cpu0 has its P-state set and all other
cores are left with their values unchanged.

In most cases, this is not too serious because the P-states will be set
correctly when the timer function is run.  But when the default governor
is set to performance, the per-CPU current_pstate stays the same forever
and no attempts are made to write the MSRs again.

Signed-off-by: Vincent Minet <vincent@vincent-minet.net>
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 127ead814619..86631cb6f7de 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -700,9 +700,8 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
 
         cpu = all_cpu_data[cpunum];
 
-        intel_pstate_get_cpu_pstates(cpu);
-
         cpu->cpu = cpunum;
+        intel_pstate_get_cpu_pstates(cpu);
 
         init_timer_deferrable(&cpu->timer);
         cpu->timer.function = intel_pstate_timer_func;