8 files changed, 107 insertions, 32 deletions

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index bba9b72e25f8..0710004055c8 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -156,6 +156,16 @@ int acpi_bus_get_private_data(acpi_handle handle, void **data)
 }
 EXPORT_SYMBOL(acpi_bus_get_private_data);
 
+void acpi_bus_no_hotplug(acpi_handle handle)
+{
+        struct acpi_device *adev = NULL;
+
+        acpi_bus_get_device(handle, &adev);
+        if (adev)
+                adev->flags.no_hotplug = true;
+}
+EXPORT_SYMBOL_GPL(acpi_bus_no_hotplug);
+
 static void acpi_print_osc_error(acpi_handle handle,
         struct acpi_osc_context *context, char *error)
 {
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 16d7b4ac94be..8d19f7c06010 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -839,9 +839,6 @@ static void cpufreq_init_policy(struct cpufreq_policy *policy)
 
         /* set default policy */
         ret = cpufreq_set_policy(policy, &new_policy);
-        policy->user_policy.policy = policy->policy;
-        policy->user_policy.governor = policy->governor;
-
         if (ret) {
                 pr_debug("setting policy failed\n");
                 if (cpufreq_driver->exit)
@@ -1016,15 +1013,17 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
         read_unlock_irqrestore(&cpufreq_driver_lock, flags);
 #endif
 
-        if (frozen)
-                /* Restore the saved policy when doing light-weight init */
-                policy = cpufreq_policy_restore(cpu);
-        else
+        /*
+         * Restore the saved policy when doing light-weight init and fall back
+         * to the full init if that fails.
+         */
+        policy = frozen ? cpufreq_policy_restore(cpu) : NULL;
+        if (!policy) {
+                frozen = false;
                 policy = cpufreq_policy_alloc();
-
-        if (!policy)
-                goto nomem_out;
-
+                if (!policy)
+                        goto nomem_out;
+        }
 
         /*
          * In the resume path, since we restore a saved policy, the assignment
@@ -1069,8 +1068,10 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
          */
         cpumask_and(policy->cpus, policy->cpus, cpu_online_mask);
 
-        policy->user_policy.min = policy->min;
-        policy->user_policy.max = policy->max;
+        if (!frozen) {
+                policy->user_policy.min = policy->min;
+                policy->user_policy.max = policy->max;
+        }
 
         blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
                                      CPUFREQ_START, policy);
@@ -1101,6 +1102,11 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
 
         cpufreq_init_policy(policy);
 
+        if (!frozen) {
+                policy->user_policy.policy = policy->policy;
+                policy->user_policy.governor = policy->governor;
+        }
+
         kobject_uevent(&policy->kobj, KOBJ_ADD);
         up_read(&cpufreq_rwsem);
 
@@ -1118,8 +1124,11 @@ err_get_freq:
         if (cpufreq_driver->exit)
                 cpufreq_driver->exit(policy);
 err_set_policy_cpu:
-        if (frozen)
+        if (frozen) {
+                /* Do not leave stale fallback data behind. */
+                per_cpu(cpufreq_cpu_data_fallback, cpu) = NULL;
                 cpufreq_policy_put_kobj(policy);
+        }
         cpufreq_policy_free(policy);
 
 nomem_out:
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 5f1cbae36961..f9d561e198ab 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -614,6 +614,11 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
         cpu = all_cpu_data[cpunum];
 
         intel_pstate_get_cpu_pstates(cpu);
+        if (!cpu->pstate.current_pstate) {
+                all_cpu_data[cpunum] = NULL;
+                kfree(cpu);
+                return -ENODATA;
+        }
 
         cpu->cpu = cpunum;
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
index 95c740454049..ba0183fb84f3 100644
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -51,6 +51,7 @@ static struct nouveau_dsm_priv {
         bool dsm_detected;
         bool optimus_detected;
         acpi_handle dhandle;
+        acpi_handle other_handle;
         acpi_handle rom_handle;
 } nouveau_dsm_priv;
 
@@ -260,9 +261,10 @@ static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
         if (!dhandle)
                 return false;
 
-        if (!acpi_has_method(dhandle, "_DSM"))
+        if (!acpi_has_method(dhandle, "_DSM")) {
+                nouveau_dsm_priv.other_handle = dhandle;
                 return false;
-
+        }
         if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
                 retval |= NOUVEAU_DSM_HAS_MUX;
 
@@ -338,6 +340,16 @@ static bool nouveau_dsm_detect(void)
                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
                         acpi_method_name);
                 nouveau_dsm_priv.dsm_detected = true;
+                /*
+                 * On some systems hotplug events are generated for the device
+                 * being switched off when _DSM is executed.  They cause ACPI
+                 * hotplug to trigger and attempt to remove the device from
+                 * the system, which causes it to break down.  Prevent that from
+                 * happening by setting the no_hotplug flag for the involved
+                 * ACPI device objects.
+                 */
+                acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle);
+                acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle);
                 ret = true;
         }
 
diff --git a/drivers/gpu/drm/radeon/radeon_atpx_handler.c b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
index 9d302eaeea15..485848f889f5 100644
--- a/drivers/gpu/drm/radeon/radeon_atpx_handler.c
+++ b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
@@ -33,6 +33,7 @@ static struct radeon_atpx_priv {
         bool atpx_detected;
         /* handle for device - and atpx */
         acpi_handle dhandle;
+        acpi_handle other_handle;
         struct radeon_atpx atpx;
 } radeon_atpx_priv;
 
@@ -451,9 +452,10 @@ static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
                 return false;
 
         status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
-        if (ACPI_FAILURE(status))
+        if (ACPI_FAILURE(status)) {
+                radeon_atpx_priv.other_handle = dhandle;
                 return false;
-
+        }
         radeon_atpx_priv.dhandle = dhandle;
         radeon_atpx_priv.atpx.handle = atpx_handle;
         return true;
@@ -530,6 +532,16 @@ static bool radeon_atpx_detect(void)
                 printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
                        acpi_method_name);
                 radeon_atpx_priv.atpx_detected = true;
+                /*
+                 * On some systems hotplug events are generated for the device
+                 * being switched off when ATPX is executed.  They cause ACPI
+                 * hotplug to trigger and attempt to remove the device from
+                 * the system, which causes it to break down.  Prevent that from
+                 * happening by setting the no_hotplug flag for the involved
+                 * ACPI device objects.
+                 */
+                acpi_bus_no_hotplug(radeon_atpx_priv.dhandle);
+                acpi_bus_no_hotplug(radeon_atpx_priv.other_handle);
                 return true;
         }
         return false;
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 1cf605f67673..e86439283a5d 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -279,7 +279,9 @@ static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data,
 
         status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
         if (ACPI_FAILURE(status)) {
-                acpi_handle_warn(handle, "can't evaluate _ADR (%#x)\n", status);
+                if (status != AE_NOT_FOUND)
+                        acpi_handle_warn(handle,
+                                "can't evaluate _ADR (%#x)\n", status);
                 return AE_OK;
         }
 
@@ -643,6 +645,24 @@ static void disable_slot(struct acpiphp_slot *slot)
         slot->flags &= (~SLOT_ENABLED);
 }
 
+static bool acpiphp_no_hotplug(acpi_handle handle)
+{
+        struct acpi_device *adev = NULL;
+
+        acpi_bus_get_device(handle, &adev);
+        return adev && adev->flags.no_hotplug;
+}
+
+static bool slot_no_hotplug(struct acpiphp_slot *slot)
+{
+        struct acpiphp_func *func;
+
+        list_for_each_entry(func, &slot->funcs, sibling)
+                if (acpiphp_no_hotplug(func_to_handle(func)))
+                        return true;
+
+        return false;
+}
 
 /**
  * get_slot_status - get ACPI slot status
@@ -701,7 +721,8 @@ static void trim_stale_devices(struct pci_dev *dev)
                 unsigned long long sta;
 
                 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
-                alive = ACPI_SUCCESS(status) && sta == ACPI_STA_ALL;
+                alive = (ACPI_SUCCESS(status) && sta == ACPI_STA_ALL)
+                        || acpiphp_no_hotplug(handle);
         }
         if (!alive) {
                 u32 v;
@@ -741,8 +762,9 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
                 struct pci_dev *dev, *tmp;
 
                 mutex_lock(&slot->crit_sect);
-                /* wake up all functions */
-                if (get_slot_status(slot) == ACPI_STA_ALL) {
+                if (slot_no_hotplug(slot)) {
+                        ; /* do nothing */
+                } else if (get_slot_status(slot) == ACPI_STA_ALL) {
                         /* remove stale devices if any */
                         list_for_each_entry_safe(dev, tmp, &bus->devices,
                                                  bus_list)
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 577074efbe62..f7ebdba14bde 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -330,29 +330,32 @@ static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
 static void pci_acpi_setup(struct device *dev)
 {
         struct pci_dev *pci_dev = to_pci_dev(dev);
-        acpi_handle handle = ACPI_HANDLE(dev);
-        struct acpi_device *adev;
+        struct acpi_device *adev = ACPI_COMPANION(dev);
 
-        if (acpi_bus_get_device(handle, &adev) || !adev->wakeup.flags.valid)
+        if (!adev)
+                return;
+
+        pci_acpi_add_pm_notifier(adev, pci_dev);
+        if (!adev->wakeup.flags.valid)
                 return;
 
         device_set_wakeup_capable(dev, true);
         acpi_pci_sleep_wake(pci_dev, false);
-
-        pci_acpi_add_pm_notifier(adev, pci_dev);
         if (adev->wakeup.flags.run_wake)
                 device_set_run_wake(dev, true);
 }
 
 static void pci_acpi_cleanup(struct device *dev)
 {
-        acpi_handle handle = ACPI_HANDLE(dev);
-        struct acpi_device *adev;
+        struct acpi_device *adev = ACPI_COMPANION(dev);
+
+        if (!adev)
+                return;
 
-        if (!acpi_bus_get_device(handle, &adev) && adev->wakeup.flags.valid) {
+        pci_acpi_remove_pm_notifier(adev);
+        if (adev->wakeup.flags.valid) {
                 device_set_wakeup_capable(dev, false);
                 device_set_run_wake(dev, false);
-                pci_acpi_remove_pm_notifier(adev);
         }
 }
 
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index c602c7718421..ddabed1f51c2 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -169,7 +169,8 @@ struct acpi_device_flags {
         u32 ejectable:1;
         u32 power_manageable:1;
         u32 match_driver:1;
-        u32 reserved:27;
+        u32 no_hotplug:1;
+        u32 reserved:26;
 };
 
 /* File System */
@@ -344,6 +345,7 @@ extern struct kobject *acpi_kobj;
 extern int acpi_bus_generate_netlink_event(const char*, const char*, u8, int);
 void acpi_bus_private_data_handler(acpi_handle, void *);
 int acpi_bus_get_private_data(acpi_handle, void **);
+void acpi_bus_no_hotplug(acpi_handle handle);
 extern int acpi_notifier_call_chain(struct acpi_device *, u32, u32);
 extern int register_acpi_notifier(struct notifier_block *);
 extern int unregister_acpi_notifier(struct notifier_block *);