1 files changed, 149 insertions, 131 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 095c8aca141e..89f2f08b2554 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -16,11 +16,15 @@
 #include <linux/acpi.h>
 #include <linux/dmi.h>
 #include <linux/sched.h>       /* need_resched() */
-#include <linux/sort.h>
 #include <linux/tick.h>
 #include <linux/cpuidle.h>
 #include <linux/cpu.h>
+#include <linux/minmax.h>
+#include <linux/perf_event.h>
 #include <acpi/processor.h>
+#include <linux/context_tracking.h>
+
+#include "internal.h"
 
 /*
  * Include the apic definitions for x86 to have the APIC timer related defines
@@ -36,11 +40,11 @@
 #define ACPI_IDLE_STATE_START	(IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX) ? 1 : 0)
 
 static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
-module_param(max_cstate, uint, 0000);
-static unsigned int nocst __read_mostly;
-module_param(nocst, uint, 0000);
-static int bm_check_disable __read_mostly;
-module_param(bm_check_disable, uint, 0000);
+module_param(max_cstate, uint, 0400);
+static bool nocst __read_mostly;
+module_param(nocst, bool, 0400);
+static bool bm_check_disable __read_mostly;
+module_param(bm_check_disable, bool, 0400);
 
 static unsigned int latency_factor __read_mostly = 2;
 module_param(latency_factor, uint, 0644);
@@ -53,6 +57,12 @@ struct cpuidle_driver acpi_idle_driver = {
 };
 
 #ifdef CONFIG_ACPI_PROCESSOR_CSTATE
+void acpi_idle_rescan_dead_smt_siblings(void)
+{
+	if (cpuidle_get_driver() == &acpi_idle_driver)
+		arch_cpu_rescan_dead_smt_siblings();
+}
+
 static
 DEFINE_PER_CPU(struct acpi_processor_cx * [CPUIDLE_STATE_MAX], acpi_cstate);
 
@@ -106,8 +116,8 @@ static const struct dmi_system_id processor_power_dmi_table[] = {
 static void __cpuidle acpi_safe_halt(void)
 {
 	if (!tif_need_resched()) {
-		safe_halt();
-		local_irq_disable();
+		raw_safe_halt();
+		raw_local_irq_disable();
 	}
 }
 
@@ -144,7 +154,7 @@ static void lapic_timer_check_state(int state, struct acpi_processor *pr,
 
 static void __lapic_timer_propagate_broadcast(void *arg)
 {
-	struct acpi_processor *pr = (struct acpi_processor *) arg;
+	struct acpi_processor *pr = arg;
 
 	if (pr->power.timer_broadcast_on_state < INT_MAX)
 		tick_broadcast_enable();
@@ -266,6 +276,10 @@ static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
 			 ACPI_CX_DESC_LEN, "ACPI P_LVL3 IOPORT 0x%x",
 			 pr->power.states[ACPI_STATE_C3].address);
 
+	if (!pr->power.states[ACPI_STATE_C2].address &&
+	    !pr->power.states[ACPI_STATE_C3].address)
+		return -ENODEV;
+
 	return 0;
 }
 
@@ -321,7 +335,7 @@ static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
 	 * the erratum), but this is known to disrupt certain ISA
 	 * devices thus we take the conservative approach.
 	 */
-	else if (errata.piix4.fdma) {
+	if (errata.piix4.fdma) {
 		acpi_handle_debug(pr->handle,
 				  "C3 not supported on PIIX4 with Type-F DMA\n");
 		return;
@@ -381,32 +395,26 @@ static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
 	 * handle BM_RLD is to set it and leave it set.
 	 */
 	acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
-
-	return;
 }
 
-static int acpi_cst_latency_cmp(const void *a, const void *b)
+static void acpi_cst_latency_sort(struct acpi_processor_cx *states, size_t length)
 {
-	const struct acpi_processor_cx *x = a, *y = b;
+	int i, j, k;
 
-	if (!(x->valid && y->valid))
-		return 0;
-	if (x->latency > y->latency)
-		return 1;
-	if (x->latency < y->latency)
-		return -1;
-	return 0;
-}
-static void acpi_cst_latency_swap(void *a, void *b, int n)
-{
-	struct acpi_processor_cx *x = a, *y = b;
-	u32 tmp;
+	for (i = 1; i < length; i++) {
+		if (!states[i].valid)
+			continue;
 
-	if (!(x->valid && y->valid))
-		return;
-	tmp = x->latency;
-	x->latency = y->latency;
-	y->latency = tmp;
+		for (j = i - 1, k = i; j >= 0; j--) {
+			if (!states[j].valid)
+				continue;
+
+			if (states[j].latency > states[k].latency)
+				swap(states[j].latency, states[k].latency);
+
+			k = j;
+		}
+	}
 }
 
 static int acpi_processor_power_verify(struct acpi_processor *pr)
@@ -451,23 +459,18 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
 
 	if (buggy_latency) {
 		pr_notice("FW issue: working around C-state latencies out of order\n");
-		sort(&pr->power.states[1], max_cstate,
-		     sizeof(struct acpi_processor_cx),
-		     acpi_cst_latency_cmp,
-		     acpi_cst_latency_swap);
+		acpi_cst_latency_sort(&pr->power.states[1], max_cstate);
 	}
 
 	lapic_timer_propagate_broadcast(pr);
 
-	return (working);
+	return working;
 }
 
 static int acpi_processor_get_cstate_info(struct acpi_processor *pr)
 {
-	unsigned int i;
 	int result;
 
-
 	/* NOTE: the idle thread may not be running while calling
 	 * this function */
 
@@ -484,17 +487,7 @@ static int acpi_processor_get_cstate_info(struct acpi_processor *pr)
 	acpi_processor_get_power_info_default(pr);
 
 	pr->power.count = acpi_processor_power_verify(pr);
-
-	/*
-	 * if one state of type C2 or C3 is available, mark this
-	 * CPU as being "idle manageable"
-	 */
-	for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
-		if (pr->power.states[i].valid) {
-			pr->power.count = i;
-			pr->flags.power = 1;
-		}
-	}
+	pr->flags.power = 1;
 
 	return 0;
 }
@@ -525,16 +518,36 @@ static int acpi_idle_bm_check(void)
 	return bm_status;
 }
 
-static void wait_for_freeze(void)
+static __cpuidle void io_idle(unsigned long addr)
 {
+	/* IO port based C-state */
+	inb(addr);
+
 #ifdef	CONFIG_X86
 	/* No delay is needed if we are in guest */
 	if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
 		return;
+	/*
+	 * Modern (>=Nehalem) Intel systems use ACPI via intel_idle,
+	 * not this code.  Assume that any Intel systems using this
+	 * are ancient and may need the dummy wait.  This also assumes
+	 * that the motivating chipset issue was Intel-only.
+	 */
+	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
+		return;
 #endif
-	/* Dummy wait op - must do something useless after P_LVL2 read
-	   because chipsets cannot guarantee that STPCLK# signal
-	   gets asserted in time to freeze execution properly. */
+	/*
+	 * Dummy wait op - must do something useless after P_LVL2 read
+	 * because chipsets cannot guarantee that STPCLK# signal gets
+	 * asserted in time to freeze execution properly
+	 *
+	 * This workaround has been in place since the original ACPI
+	 * implementation was merged, circa 2002.
+	 *
+	 * If a profile is pointing to this instruction, please first
+	 * consider moving your system to a more modern idle
+	 * mechanism.
+	 */
 	inl(acpi_gbl_FADT.xpm_timer_block.address);
 }
 
@@ -546,16 +559,18 @@ static void wait_for_freeze(void)
  */
 static void __cpuidle acpi_idle_do_entry(struct acpi_processor_cx *cx)
 {
+	perf_lopwr_cb(true);
+
 	if (cx->entry_method == ACPI_CSTATE_FFH) {
 		/* Call into architectural FFH based C-state */
 		acpi_processor_ffh_cstate_enter(cx);
 	} else if (cx->entry_method == ACPI_CSTATE_HALT) {
 		acpi_safe_halt();
 	} else {
-		/* IO port based C-state */
-		inb(cx->address);
-		wait_for_freeze();
+		io_idle(cx->address);
 	}
+
+	perf_lopwr_cb(false);
 }
 
 /**
@@ -563,7 +578,7 @@ static void __cpuidle acpi_idle_do_entry(struct acpi_processor_cx *cx)
  * @dev: the target CPU
  * @index: the index of suggested state
  */
-static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
+static void acpi_idle_play_dead(struct cpuidle_device *dev, int index)
 {
 	struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
 
@@ -572,23 +587,17 @@ static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
 	while (1) {
 
 		if (cx->entry_method == ACPI_CSTATE_HALT)
-			safe_halt();
+			raw_safe_halt();
 		else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) {
-			inb(cx->address);
-			wait_for_freeze();
+			io_idle(cx->address);
+		} else if (cx->entry_method == ACPI_CSTATE_FFH) {
+			acpi_processor_ffh_play_dead(cx);
 		} else
-			return -ENODEV;
-
-#if defined(CONFIG_X86) && defined(CONFIG_HOTPLUG_CPU)
-		cond_wakeup_cpu0();
-#endif
+			return;
 	}
-
-	/* Never reached */
-	return 0;
 }
 
-static bool acpi_idle_fallback_to_c1(struct acpi_processor *pr)
+static __always_inline bool acpi_idle_fallback_to_c1(struct acpi_processor *pr)
 {
 	return IS_ENABLED(CONFIG_HOTPLUG_CPU) && !pr->flags.has_cst &&
 		!(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED);
@@ -604,7 +613,7 @@ static DEFINE_RAW_SPINLOCK(c3_lock);
  * @cx: Target state context
  * @index: index of target state
  */
-static int acpi_idle_enter_bm(struct cpuidle_driver *drv,
+static int __cpuidle acpi_idle_enter_bm(struct cpuidle_driver *drv,
 			       struct acpi_processor *pr,
 			       struct acpi_processor_cx *cx,
 			       int index)
@@ -623,6 +632,8 @@ static int acpi_idle_enter_bm(struct cpuidle_driver *drv,
 	 */
 	bool dis_bm = pr->flags.bm_control;
 
+	instrumentation_begin();
+
 	/* If we can skip BM, demote to a safe state. */
 	if (!cx->bm_sts_skip && acpi_idle_bm_check()) {
 		dis_bm = false;
@@ -644,11 +655,11 @@ static int acpi_idle_enter_bm(struct cpuidle_driver *drv,
 		raw_spin_unlock(&c3_lock);
 	}
 
-	rcu_idle_enter();
+	ct_cpuidle_enter();
 
 	acpi_idle_do_entry(cx);
 
-	rcu_idle_exit();
+	ct_cpuidle_exit();
 
 	/* Re-enable bus master arbitration */
 	if (dis_bm) {
@@ -658,10 +669,12 @@ static int acpi_idle_enter_bm(struct cpuidle_driver *drv,
 		raw_spin_unlock(&c3_lock);
 	}
 
+	instrumentation_end();
+
 	return index;
 }
 
-static int acpi_idle_enter(struct cpuidle_device *dev,
+static int __cpuidle acpi_idle_enter(struct cpuidle_device *dev,
 			   struct cpuidle_driver *drv, int index)
 {
 	struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
@@ -690,7 +703,7 @@ static int acpi_idle_enter(struct cpuidle_device *dev,
 	return index;
 }
 
-static int acpi_idle_enter_s2idle(struct cpuidle_device *dev,
+static int __cpuidle acpi_idle_enter_s2idle(struct cpuidle_device *dev,
 				  struct cpuidle_driver *drv, int index)
 {
 	struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
@@ -719,18 +732,16 @@ static int acpi_idle_enter_s2idle(struct cpuidle_device *dev,
 	return 0;
 }
 
-static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
-					   struct cpuidle_device *dev)
+static void acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
+					    struct cpuidle_device *dev)
 {
 	int i, count = ACPI_IDLE_STATE_START;
 	struct acpi_processor_cx *cx;
-	struct cpuidle_state *state;
 
 	if (max_cstate == 0)
 		max_cstate = 1;
 
 	for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
-		state = &acpi_idle_driver.states[count];
 		cx = &pr->power.states[i];
 
 		if (!cx->valid)
@@ -738,27 +749,13 @@ static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
 
 		per_cpu(acpi_cstate[count], dev->cpu) = cx;
 
-		if (lapic_timer_needs_broadcast(pr, cx))
-			state->flags |= CPUIDLE_FLAG_TIMER_STOP;
-
-		if (cx->type == ACPI_STATE_C3) {
-			state->flags |= CPUIDLE_FLAG_TLB_FLUSHED;
-			if (pr->flags.bm_check)
-				state->flags |= CPUIDLE_FLAG_RCU_IDLE;
-		}
-
 		count++;
 		if (count == CPUIDLE_STATE_MAX)
 			break;
 	}
-
-	if (!count)
-		return -EINVAL;
-
-	return 0;
 }
 
-static int acpi_processor_setup_cstates(struct acpi_processor *pr)
+static void acpi_processor_setup_cstates(struct acpi_processor *pr)
 {
 	int i, count;
 	struct acpi_processor_cx *cx;
@@ -783,16 +780,18 @@ static int acpi_processor_setup_cstates(struct acpi_processor *pr)
 
 		state = &drv->states[count];
 		snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
-		strlcpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
+		strscpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
 		state->exit_latency = cx->latency;
 		state->target_residency = cx->latency * latency_factor;
 		state->enter = acpi_idle_enter;
 
 		state->flags = 0;
-		if (cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2) {
-			state->enter_dead = acpi_idle_play_dead;
+
+		state->enter_dead = acpi_idle_play_dead;
+
+		if (cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2)
 			drv->safe_state_index = count;
-		}
+
 		/*
 		 * Halt-induced C1 is not good for ->enter_s2idle, because it
 		 * re-enables interrupts on exit.  Moreover, C1 is generally not
@@ -803,17 +802,21 @@ static int acpi_processor_setup_cstates(struct acpi_processor *pr)
 		if (cx->type != ACPI_STATE_C1 && !acpi_idle_fallback_to_c1(pr))
 			state->enter_s2idle = acpi_idle_enter_s2idle;
 
+		if (lapic_timer_needs_broadcast(pr, cx))
+			state->flags |= CPUIDLE_FLAG_TIMER_STOP;
+
+		if (cx->type == ACPI_STATE_C3) {
+			state->flags |= CPUIDLE_FLAG_TLB_FLUSHED;
+			if (pr->flags.bm_check)
+				state->flags |= CPUIDLE_FLAG_RCU_IDLE;
+		}
+
 		count++;
 		if (count == CPUIDLE_STATE_MAX)
 			break;
 	}
 
 	drv->state_count = count;
-
-	if (!count)
-		return -EINVAL;
-
-	return 0;
 }
 
 static inline void acpi_processor_cstate_first_run_checks(void)
@@ -950,7 +953,7 @@ static int acpi_processor_evaluate_lpi(acpi_handle handle,
 
 		obj = pkg_elem + 9;
 		if (obj->type == ACPI_TYPE_STRING)
-			strlcpy(lpi_state->desc, obj->string.pointer,
+			strscpy(lpi_state->desc, obj->string.pointer,
 				ACPI_CX_DESC_LEN);
 
 		lpi_state->index = state_idx;
@@ -983,11 +986,6 @@ end:
 	return ret;
 }
 
-/*
- * flat_state_cnt - the number of composite LPI states after the process of flattening
- */
-static int flat_state_cnt;
-
 /**
  * combine_lpi_states - combine local and parent LPI states to form a composite LPI state
  *
@@ -1016,7 +1014,7 @@ static bool combine_lpi_states(struct acpi_lpi_state *local,
 	result->arch_flags = parent->arch_flags;
 	result->index = parent->index;
 
-	strlcpy(result->desc, local->desc, ACPI_CX_DESC_LEN);
+	strscpy(result->desc, local->desc, ACPI_CX_DESC_LEN);
 	strlcat(result->desc, "+", ACPI_CX_DESC_LEN);
 	strlcat(result->desc, parent->desc, ACPI_CX_DESC_LEN);
 	return true;
@@ -1030,9 +1028,10 @@ static void stash_composite_state(struct acpi_lpi_states_array *curr_level,
 	curr_level->composite_states[curr_level->composite_states_size++] = t;
 }
 
-static int flatten_lpi_states(struct acpi_processor *pr,
-			      struct acpi_lpi_states_array *curr_level,
-			      struct acpi_lpi_states_array *prev_level)
+static unsigned int flatten_lpi_states(struct acpi_processor *pr,
+				       unsigned int flat_state_cnt,
+				       struct acpi_lpi_states_array *curr_level,
+				       struct acpi_lpi_states_array *prev_level)
 {
 	int i, j, state_count = curr_level->size;
 	struct acpi_lpi_state *p, *t = curr_level->entries;
@@ -1072,7 +1071,12 @@ static int flatten_lpi_states(struct acpi_processor *pr,
 	}
 
 	kfree(curr_level->entries);
-	return 0;
+	return flat_state_cnt;
+}
+
+int __weak acpi_processor_ffh_lpi_probe(unsigned int cpu)
+{
+	return -EOPNOTSUPP;
 }
 
 static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
@@ -1082,6 +1086,12 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
 	acpi_handle handle = pr->handle, pr_ahandle;
 	struct acpi_device *d = NULL;
 	struct acpi_lpi_states_array info[2], *tmp, *prev, *curr;
+	unsigned int state_count;
+
+	/* make sure our architecture has support */
+	ret = acpi_processor_ffh_lpi_probe(pr->id);
+	if (ret == -EOPNOTSUPP)
+		return ret;
 
 	if (!osc_pc_lpi_support_confirmed)
 		return -EOPNOTSUPP;
@@ -1089,18 +1099,20 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
 	if (!acpi_has_method(handle, "_LPI"))
 		return -EINVAL;
 
-	flat_state_cnt = 0;
 	prev = &info[0];
 	curr = &info[1];
 	handle = pr->handle;
 	ret = acpi_processor_evaluate_lpi(handle, prev);
 	if (ret)
 		return ret;
-	flatten_lpi_states(pr, prev, NULL);
+	state_count = flatten_lpi_states(pr, 0, prev, NULL);
 
 	status = acpi_get_parent(handle, &pr_ahandle);
 	while (ACPI_SUCCESS(status)) {
-		acpi_bus_get_device(pr_ahandle, &d);
+		d = acpi_fetch_acpi_dev(pr_ahandle);
+		if (!d)
+			break;
+
 		handle = pr_ahandle;
 
 		if (strcmp(acpi_device_hid(d), ACPI_PROCESSOR_CONTAINER_HID))
@@ -1115,18 +1127,19 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
 			break;
 
 		/* flatten all the LPI states in this level of hierarchy */
-		flatten_lpi_states(pr, curr, prev);
+		state_count = flatten_lpi_states(pr, state_count, curr, prev);
 
 		tmp = prev, prev = curr, curr = tmp;
 
 		status = acpi_get_parent(handle, &pr_ahandle);
 	}
 
-	pr->power.count = flat_state_cnt;
 	/* reset the index after flattening */
-	for (i = 0; i < pr->power.count; i++)
+	for (i = 0; i < state_count; i++)
 		pr->power.lpi_states[i].index = i;
 
+	pr->power.count = state_count;
+
 	/* Tell driver that _LPI is supported. */
 	pr->flags.has_lpi = 1;
 	pr->flags.power = 1;
@@ -1134,11 +1147,6 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
 	return 0;
 }
 
-int __weak acpi_processor_ffh_lpi_probe(unsigned int cpu)
-{
-	return -ENODEV;
-}
-
 int __weak acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi)
 {
 	return -ENODEV;
@@ -1185,11 +1193,12 @@ static int acpi_processor_setup_lpi_states(struct acpi_processor *pr)
 
 		state = &drv->states[i];
 		snprintf(state->name, CPUIDLE_NAME_LEN, "LPI-%d", i);
-		strlcpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN);
+		strscpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN);
 		state->exit_latency = lpi->wake_latency;
 		state->target_residency = lpi->min_residency;
-		if (lpi->arch_flags)
-			state->flags |= CPUIDLE_FLAG_TIMER_STOP;
+		state->flags |= arch_get_idle_state_flags(lpi->arch_flags);
+		if (i != 0 && lpi->entry_method == ACPI_CSTATE_FFH)
+			state->flags |= CPUIDLE_FLAG_RCU_IDLE;
 		state->enter = acpi_idle_lpi_enter;
 		drv->safe_state_index = i;
 	}
@@ -1222,7 +1231,8 @@ static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
 	if (pr->flags.has_lpi)
 		return acpi_processor_setup_lpi_states(pr);
 
-	return acpi_processor_setup_cstates(pr);
+	acpi_processor_setup_cstates(pr);
+	return 0;
 }
 
 /**
@@ -1242,7 +1252,8 @@ static int acpi_processor_setup_cpuidle_dev(struct acpi_processor *pr,
 	if (pr->flags.has_lpi)
 		return acpi_processor_ffh_lpi_probe(pr->id);
 
-	return acpi_processor_setup_cpuidle_cx(pr, dev);
+	acpi_processor_setup_cpuidle_cx(pr, dev);
+	return 0;
 }
 
 static int acpi_processor_get_power_info(struct acpi_processor *pr)
@@ -1301,7 +1312,7 @@ int acpi_processor_power_state_has_changed(struct acpi_processor *pr)
 	if (pr->id == 0 && cpuidle_get_driver() == &acpi_idle_driver) {
 
 		/* Protect against cpu-hotplug */
-		get_online_cpus();
+		cpus_read_lock();
 		cpuidle_pause_and_lock();
 
 		/* Disable all cpuidle devices */
@@ -1330,7 +1341,7 @@ int acpi_processor_power_state_has_changed(struct acpi_processor *pr)
 			}
 		}
 		cpuidle_resume_and_unlock();
-		put_online_cpus();
+		cpus_read_unlock();
 	}
 
 	return 0;
@@ -1381,6 +1392,9 @@ int acpi_processor_power_init(struct acpi_processor *pr)
 		if (retval) {
 			if (acpi_processor_registered == 0)
 				cpuidle_unregister_driver(&acpi_idle_driver);
+
+			per_cpu(acpi_cpuidle_device, pr->id) = NULL;
+			kfree(dev);
 			return retval;
 		}
 		acpi_processor_registered++;
@@ -1400,8 +1414,12 @@ int acpi_processor_power_exit(struct acpi_processor *pr)
 		acpi_processor_registered--;
 		if (acpi_processor_registered == 0)
 			cpuidle_unregister_driver(&acpi_idle_driver);
+
+		kfree(dev);
 	}
 
 	pr->flags.power_setup_done = 0;
 	return 0;
 }
+
+MODULE_IMPORT_NS("ACPI_PROCESSOR_IDLE");