rt2x00: Simplify suspend/resume handling

With mac80211 handling all open interfaces during
suspend and resume we can simplify suspend/resume
within rt2x00lib.

The only thing rt2x00 needs to do is free up memory
during suspend and bring back the minimal required
components during resume.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 88 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index cd4447502d8b..e1b40545a9be 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -881,23 +881,17 @@ EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
 #ifdef CONFIG_PM
 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
 {
-        int retval;
-
         NOTICE(rt2x00dev, "Going to sleep.\n");
 
         /*
-         * Only continue if mac80211 has open interfaces.
+         * Prevent mac80211 from accessing driver while suspended.
          */
-        if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
-            !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
-                goto exit;
-
-        set_bit(DEVICE_STATE_STARTED_SUSPEND, &rt2x00dev->flags);
+        if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
+                return 0;
 
         /*
-         * Disable radio.
+         * Cleanup as much as possible.
          */
-        rt2x00lib_stop(rt2x00dev);
         rt2x00lib_uninitialize(rt2x00dev);
 
         /*
@@ -906,7 +900,6 @@ int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
         rt2x00leds_suspend(rt2x00dev);
         rt2x00debug_deregister(rt2x00dev);
 
-exit:
         /*
          * Set device mode to sleep for power management,
          * on some hardware this call seems to consistently fail.
@@ -918,8 +911,7 @@ exit:
          * the radio and the other components already disabled the
          * device is as good as disabled.
          */
-        retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
-        if (retval)
+        if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
                         "continue suspending.\n");
 
@@ -927,34 +919,8 @@ exit:
 }
 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
 
-static void rt2x00lib_resume_intf(void *data, u8 *mac,
-                                  struct ieee80211_vif *vif)
-{
-        struct rt2x00_dev *rt2x00dev = data;
-        struct rt2x00_intf *intf = vif_to_intf(vif);
-
-        spin_lock(&intf->lock);
-
-        rt2x00lib_config_intf(rt2x00dev, intf,
-                              vif->type, intf->mac, intf->bssid);
-
-
-        /*
-         * AP, Ad-hoc, and Mesh Point mode require a new beacon update.
-         */
-        if (vif->type == NL80211_IFTYPE_AP ||
-            vif->type == NL80211_IFTYPE_ADHOC ||
-            vif->type == NL80211_IFTYPE_MESH_POINT ||
-            vif->type == NL80211_IFTYPE_WDS)
-                intf->delayed_flags |= DELAYED_UPDATE_BEACON;
-
-        spin_unlock(&intf->lock);
-}
-
 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
 {
-        int retval;
-
         NOTICE(rt2x00dev, "Waking up.\n");
 
         /*
@@ -964,60 +930,11 @@ int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
         rt2x00leds_resume(rt2x00dev);
 
         /*
-         * Only continue if mac80211 had open interfaces.
-         */
-        if (!test_and_clear_bit(DEVICE_STATE_STARTED_SUSPEND, &rt2x00dev->flags))
-                return 0;
-
-        /*
-         * Reinitialize device and all active interfaces.
-         */
-        retval = rt2x00lib_start(rt2x00dev);
-        if (retval)
-                goto exit;
-
-        /*
-         * Reconfigure device.
-         */
-        retval = rt2x00mac_config(rt2x00dev->hw, ~0);
-        if (retval)
-                goto exit;
-
-        /*
-         * Iterator over each active interface to
-         * reconfigure the hardware.
-         */
-        ieee80211_iterate_active_interfaces(rt2x00dev->hw,
-                                            rt2x00lib_resume_intf, rt2x00dev);
-
-        /*
          * We are ready again to receive requests from mac80211.
          */
         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 
-        /*
-         * It is possible that during that mac80211 has attempted
-         * to send frames while we were suspending or resuming.
-         * In that case we have disabled the TX queue and should
-         * now enable it again
-         */
-        ieee80211_wake_queues(rt2x00dev->hw);
-
-        /*
-         * During interface iteration we might have changed the
-         * delayed_flags, time to handles the event by calling
-         * the work handler directly.
-         */
-        rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
-
         return 0;
-
-exit:
-        rt2x00lib_stop(rt2x00dev);
-        rt2x00lib_uninitialize(rt2x00dev);
-        rt2x00debug_deregister(rt2x00dev);
-
-        return retval;
 }
 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
 #endif /* CONFIG_PM */