cpufreq: intel_pstate: Simplify spinlock locking

Because intel_pstate_enable/disable_hwp_interrupt() are only called from
thread context, they need not save the IRQ flags when using a spinlock
as interrupts are guaranteed to be enabled when they run, so make them
use spin_lock/unlock_irq().
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/intel_pstate.c

@@ -1682,30 +1682,26 @@ void notify_hwp_interrupt(void)
 
 static void intel_pstate_disable_hwp_interrupt(struct cpudata *cpudata)
 {
-	unsigned long flags;
-
 	if (!boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
 		return;
 
 	/* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */
 	wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
 
-	spin_lock_irqsave(&hwp_notify_lock, flags);
+	spin_lock_irq(&hwp_notify_lock);
 	if (cpumask_test_and_clear_cpu(cpudata->cpu, &hwp_intr_enable_mask))
 		cancel_delayed_work(&cpudata->hwp_notify_work);
-	spin_unlock_irqrestore(&hwp_notify_lock, flags);
+	spin_unlock_irq(&hwp_notify_lock);
 }
 
 static void intel_pstate_enable_hwp_interrupt(struct cpudata *cpudata)
 {
 	/* Enable HWP notification interrupt for guaranteed performance change */
 	if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY)) {
-		unsigned long flags;
-
-		spin_lock_irqsave(&hwp_notify_lock, flags);
+		spin_lock_irq(&hwp_notify_lock);
 		INIT_DELAYED_WORK(&cpudata->hwp_notify_work, intel_pstate_notify_work);
 		cpumask_set_cpu(cpudata->cpu, &hwp_intr_enable_mask);
-		spin_unlock_irqrestore(&hwp_notify_lock, flags);
+		spin_unlock_irq(&hwp_notify_lock);
 
 		/* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */
 		wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x01);