1 files changed, 94 insertions, 89 deletions

diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
index 25ba3bd57e66..3c94f76d5525 100644
--- a/net/rfkill/rfkill.c
+++ b/net/rfkill/rfkill.c
@@ -51,51 +51,7 @@ struct rfkill_gsw_state {
 
 static struct rfkill_gsw_state rfkill_global_states[RFKILL_TYPE_MAX];
 static unsigned long rfkill_states_lockdflt[BITS_TO_LONGS(RFKILL_TYPE_MAX)];
-
-static BLOCKING_NOTIFIER_HEAD(rfkill_notifier_list);
-
-
-/**
- * register_rfkill_notifier - Add notifier to rfkill notifier chain
- * @nb: pointer to the new entry to add to the chain
- *
- * See blocking_notifier_chain_register() for return value and further
- * observations.
- *
- * Adds a notifier to the rfkill notifier chain.  The chain will be
- * called with a pointer to the relevant rfkill structure as a parameter,
- * refer to include/linux/rfkill.h for the possible events.
- *
- * Notifiers added to this chain are to always return NOTIFY_DONE.  This
- * chain is a blocking notifier chain: notifiers can sleep.
- *
- * Calls to this chain may have been done through a workqueue.  One must
- * assume unordered asynchronous behaviour, there is no way to know if
- * actions related to the event that generated the notification have been
- * carried out already.
- */
-int register_rfkill_notifier(struct notifier_block *nb)
-{
-        BUG_ON(!nb);
-        return blocking_notifier_chain_register(&rfkill_notifier_list, nb);
-}
-EXPORT_SYMBOL_GPL(register_rfkill_notifier);
-
-/**
- * unregister_rfkill_notifier - remove notifier from rfkill notifier chain
- * @nb: pointer to the entry to remove from the chain
- *
- * See blocking_notifier_chain_unregister() for return value and further
- * observations.
- *
- * Removes a notifier from the rfkill notifier chain.
- */
-int unregister_rfkill_notifier(struct notifier_block *nb)
-{
-        BUG_ON(!nb);
-        return blocking_notifier_chain_unregister(&rfkill_notifier_list, nb);
-}
-EXPORT_SYMBOL_GPL(unregister_rfkill_notifier);
+static bool rfkill_epo_lock_active;
 
 
 static void rfkill_led_trigger(struct rfkill *rfkill,
@@ -123,12 +79,9 @@ static void rfkill_led_trigger_activate(struct led_classdev *led)
 }
 #endif /* CONFIG_RFKILL_LEDS */
 
-static void notify_rfkill_state_change(struct rfkill *rfkill)
+static void rfkill_uevent(struct rfkill *rfkill)
 {
-        rfkill_led_trigger(rfkill, rfkill->state);
-        blocking_notifier_call_chain(&rfkill_notifier_list,
-                        RFKILL_STATE_CHANGED,
-                        rfkill);
+        kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
 }
 
 static void update_rfkill_state(struct rfkill *rfkill)
@@ -141,7 +94,7 @@ static void update_rfkill_state(struct rfkill *rfkill)
                         oldstate = rfkill->state;
                         rfkill->state = newstate;
                         if (oldstate != newstate)
-                                notify_rfkill_state_change(rfkill);
+                                rfkill_uevent(rfkill);
                 }
                 mutex_unlock(&rfkill->mutex);
         }
@@ -219,7 +172,7 @@ static int rfkill_toggle_radio(struct rfkill *rfkill,
         }
 
         if (force || rfkill->state != oldstate)
-                notify_rfkill_state_change(rfkill);
+                rfkill_uevent(rfkill);
 
         return retval;
 }
@@ -264,11 +217,14 @@ static void __rfkill_switch_all(const enum rfkill_type type,
  *
  * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
  * Please refer to __rfkill_switch_all() for details.
+ *
+ * Does nothing if the EPO lock is active.
  */
 void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
 {
         mutex_lock(&rfkill_global_mutex);
-        __rfkill_switch_all(type, state);
+        if (!rfkill_epo_lock_active)
+                __rfkill_switch_all(type, state);
         mutex_unlock(&rfkill_global_mutex);
 }
 EXPORT_SYMBOL(rfkill_switch_all);
@@ -289,6 +245,7 @@ void rfkill_epo(void)
 
         mutex_lock(&rfkill_global_mutex);
 
+        rfkill_epo_lock_active = true;
         list_for_each_entry(rfkill, &rfkill_list, node) {
                 mutex_lock(&rfkill->mutex);
                 rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
@@ -317,6 +274,7 @@ void rfkill_restore_states(void)
 
         mutex_lock(&rfkill_global_mutex);
 
+        rfkill_epo_lock_active = false;
         for (i = 0; i < RFKILL_TYPE_MAX; i++)
                 __rfkill_switch_all(i, rfkill_global_states[i].default_state);
         mutex_unlock(&rfkill_global_mutex);
@@ -324,6 +282,48 @@ void rfkill_restore_states(void)
 EXPORT_SYMBOL_GPL(rfkill_restore_states);
 
 /**
+ * rfkill_remove_epo_lock - unlock state changes
+ *
+ * Used by rfkill-input manually unlock state changes, when
+ * the EPO switch is deactivated.
+ */
+void rfkill_remove_epo_lock(void)
+{
+        mutex_lock(&rfkill_global_mutex);
+        rfkill_epo_lock_active = false;
+        mutex_unlock(&rfkill_global_mutex);
+}
+EXPORT_SYMBOL_GPL(rfkill_remove_epo_lock);
+
+/**
+ * rfkill_is_epo_lock_active - returns true EPO is active
+ *
+ * Returns 0 (false) if there is NOT an active EPO contidion,
+ * and 1 (true) if there is an active EPO contition, which
+ * locks all radios in one of the BLOCKED states.
+ *
+ * Can be called in atomic context.
+ */
+bool rfkill_is_epo_lock_active(void)
+{
+        return rfkill_epo_lock_active;
+}
+EXPORT_SYMBOL_GPL(rfkill_is_epo_lock_active);
+
+/**
+ * rfkill_get_global_state - returns global state for a type
+ * @type: the type to get the global state of
+ *
+ * Returns the current global state for a given wireless
+ * device type.
+ */
+enum rfkill_state rfkill_get_global_state(const enum rfkill_type type)
+{
+        return rfkill_global_states[type].current_state;
+}
+EXPORT_SYMBOL_GPL(rfkill_get_global_state);
+
+/**
  * rfkill_force_state - Force the internal rfkill radio state
  * @rfkill: pointer to the rfkill class to modify.
  * @state: the current radio state the class should be forced to.
@@ -357,7 +357,7 @@ int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state)
         rfkill->state = state;
 
         if (state != oldstate)
-                notify_rfkill_state_change(rfkill);
+                rfkill_uevent(rfkill);
 
         mutex_unlock(&rfkill->mutex);
 
@@ -431,9 +431,15 @@ static ssize_t rfkill_state_store(struct device *dev,
             state != RFKILL_STATE_SOFT_BLOCKED)
                 return -EINVAL;
 
-        if (mutex_lock_interruptible(&rfkill->mutex))
-                return -ERESTARTSYS;
-        error = rfkill_toggle_radio(rfkill, state, 0);
+        error = mutex_lock_killable(&rfkill->mutex);
+        if (error)
+                return error;
+
+        if (!rfkill_epo_lock_active)
+                error = rfkill_toggle_radio(rfkill, state, 0);
+        else
+                error = -EPERM;
+
         mutex_unlock(&rfkill->mutex);
 
         return error ? error : count;
@@ -472,12 +478,12 @@ static ssize_t rfkill_claim_store(struct device *dev,
          * Take the global lock to make sure the kernel is not in
          * the middle of rfkill_switch_all
          */
-        error = mutex_lock_interruptible(&rfkill_global_mutex);
+        error = mutex_lock_killable(&rfkill_global_mutex);
         if (error)
                 return error;
 
         if (rfkill->user_claim != claim) {
-                if (!claim) {
+                if (!claim && !rfkill_epo_lock_active) {
                         mutex_lock(&rfkill->mutex);
                         rfkill_toggle_radio(rfkill,
                                         rfkill_global_states[rfkill->type].current_state,
@@ -511,24 +517,48 @@ static void rfkill_release(struct device *dev)
 #ifdef CONFIG_PM
 static int rfkill_suspend(struct device *dev, pm_message_t state)
 {
+        struct rfkill *rfkill = to_rfkill(dev);
+
         /* mark class device as suspended */
         if (dev->power.power_state.event != state.event)
                 dev->power.power_state = state;
 
+        /* store state for the resume handler */
+        rfkill->state_for_resume = rfkill->state;
+
         return 0;
 }
 
 static int rfkill_resume(struct device *dev)
 {
         struct rfkill *rfkill = to_rfkill(dev);
+        enum rfkill_state newstate;
 
         if (dev->power.power_state.event != PM_EVENT_ON) {
                 mutex_lock(&rfkill->mutex);
 
                 dev->power.power_state.event = PM_EVENT_ON;
 
-                /* restore radio state AND notify everybody */
-                rfkill_toggle_radio(rfkill, rfkill->state, 1);
+                /*
+                 * rfkill->state could have been modified before we got
+                 * called, and won't be updated by rfkill_toggle_radio()
+                 * in force mode.  Sync it FIRST.
+                 */
+                if (rfkill->get_state &&
+                    !rfkill->get_state(rfkill->data, &newstate))
+                        rfkill->state = newstate;
+
+                /*
+                 * If we are under EPO, kick transmitter offline,
+                 * otherwise restore to pre-suspend state.
+                 *
+                 * Issue a notification in any case
+                 */
+                rfkill_toggle_radio(rfkill,
+                                rfkill_epo_lock_active ?
+                                        RFKILL_STATE_SOFT_BLOCKED :
+                                        rfkill->state_for_resume,
+                                1);
 
                 mutex_unlock(&rfkill->mutex);
         }
@@ -540,28 +570,6 @@ static int rfkill_resume(struct device *dev)
 #define rfkill_resume NULL
 #endif
 
-static int rfkill_blocking_uevent_notifier(struct notifier_block *nb,
-                                        unsigned long eventid,
-                                        void *data)
-{
-        struct rfkill *rfkill = (struct rfkill *)data;
-
-        switch (eventid) {
-        case RFKILL_STATE_CHANGED:
-                kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
-                break;
-        default:
-                break;
-        }
-
-        return NOTIFY_DONE;
-}
-
-static struct notifier_block rfkill_blocking_uevent_nb = {
-        .notifier_call  = rfkill_blocking_uevent_notifier,
-        .priority       = 0,
-};
-
 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
         struct rfkill *rfkill = to_rfkill(dev);
@@ -711,7 +719,7 @@ static void rfkill_led_trigger_register(struct rfkill *rfkill)
         int error;
 
         if (!rfkill->led_trigger.name)
-                rfkill->led_trigger.name = rfkill->dev.bus_id;
+                rfkill->led_trigger.name = dev_name(&rfkill->dev);
         if (!rfkill->led_trigger.activate)
                 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
         error = led_trigger_register(&rfkill->led_trigger);
@@ -752,8 +760,7 @@ int __must_check rfkill_register(struct rfkill *rfkill)
                         "badly initialized rfkill struct\n"))
                 return -EINVAL;
 
-        snprintf(dev->bus_id, sizeof(dev->bus_id),
-                 "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
+        dev_set_name(dev, "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
 
         rfkill_led_trigger_register(rfkill);
 
@@ -833,6 +840,7 @@ int rfkill_set_default(enum rfkill_type type, enum rfkill_state state)
 
         if (!test_and_set_bit(type, rfkill_states_lockdflt)) {
                 rfkill_global_states[type].default_state = state;
+                rfkill_global_states[type].current_state = state;
                 error = 0;
         } else
                 error = -EPERM;
@@ -864,14 +872,11 @@ static int __init rfkill_init(void)
                 return error;
         }
 
-        register_rfkill_notifier(&rfkill_blocking_uevent_nb);
-
         return 0;
 }
 
 static void __exit rfkill_exit(void)
 {
-        unregister_rfkill_notifier(&rfkill_blocking_uevent_nb);
         class_unregister(&rfkill_class);
 }