mac80211: add hardware restart function
Some hardware defects may require the hardware to be re-initialised
completely from scratch. Drivers would need much information (for
instance the current MAC address, crypto keys, beaconing information,
etc.) stored duplicated from mac80211 to be able to do this, so let
mac80211 help them.
The new ieee80211_restart_hw() function requires the same code as
resuming, so move that code into a new ieee80211_reconfig() function
in util.c and leave only the suspend code in pm.c.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 1ff8353..b361e2a 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -28,6 +28,7 @@
#include "rate.h"
#include "mesh.h"
#include "wme.h"
+#include "led.h"
/* privid for wiphys to determine whether they belong to us or not */
void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
@@ -966,3 +967,120 @@
}
return supp_rates;
}
+
+int ieee80211_reconfig(struct ieee80211_local *local)
+{
+ struct ieee80211_hw *hw = &local->hw;
+ struct ieee80211_sub_if_data *sdata;
+ struct ieee80211_if_init_conf conf;
+ struct sta_info *sta;
+ unsigned long flags;
+ int res;
+
+ /* restart hardware */
+ if (local->open_count) {
+ res = local->ops->start(hw);
+
+ ieee80211_led_radio(local, hw->conf.radio_enabled);
+ }
+
+ /* add interfaces */
+ list_for_each_entry(sdata, &local->interfaces, list) {
+ if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
+ sdata->vif.type != NL80211_IFTYPE_MONITOR &&
+ netif_running(sdata->dev)) {
+ conf.vif = &sdata->vif;
+ conf.type = sdata->vif.type;
+ conf.mac_addr = sdata->dev->dev_addr;
+ res = local->ops->add_interface(hw, &conf);
+ }
+ }
+
+ /* add STAs back */
+ if (local->ops->sta_notify) {
+ spin_lock_irqsave(&local->sta_lock, flags);
+ list_for_each_entry(sta, &local->sta_list, list) {
+ if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+ sdata = container_of(sdata->bss,
+ struct ieee80211_sub_if_data,
+ u.ap);
+
+ local->ops->sta_notify(hw, &sdata->vif,
+ STA_NOTIFY_ADD, &sta->sta);
+ }
+ spin_unlock_irqrestore(&local->sta_lock, flags);
+ }
+
+ /* Clear Suspend state so that ADDBA requests can be processed */
+
+ rcu_read_lock();
+
+ if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
+ list_for_each_entry_rcu(sta, &local->sta_list, list) {
+ clear_sta_flags(sta, WLAN_STA_SUSPEND);
+ }
+ }
+
+ rcu_read_unlock();
+
+ /* setup RTS threshold */
+ if (local->ops->set_rts_threshold)
+ local->ops->set_rts_threshold(hw, local->rts_threshold);
+
+ /* reconfigure hardware */
+ ieee80211_hw_config(local, ~0);
+
+ netif_addr_lock_bh(local->mdev);
+ ieee80211_configure_filter(local);
+ netif_addr_unlock_bh(local->mdev);
+
+ /* Finally also reconfigure all the BSS information */
+ list_for_each_entry(sdata, &local->interfaces, list) {
+ u32 changed = ~0;
+ if (!netif_running(sdata->dev))
+ continue;
+ switch (sdata->vif.type) {
+ case NL80211_IFTYPE_STATION:
+ /* disable beacon change bits */
+ changed &= ~IEEE80211_IFCC_BEACON;
+ /* fall through */
+ case NL80211_IFTYPE_ADHOC:
+ case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_MESH_POINT:
+ /*
+ * Driver's config_interface can fail if rfkill is
+ * enabled. Accommodate this return code.
+ * FIXME: When mac80211 has knowledge of rfkill
+ * state the code below can change back to:
+ * WARN(ieee80211_if_config(sdata, changed));
+ * ieee80211_bss_info_change_notify(sdata, ~0);
+ */
+ if (ieee80211_if_config(sdata, changed))
+ printk(KERN_DEBUG "%s: failed to configure interface during resume\n",
+ sdata->dev->name);
+ else
+ ieee80211_bss_info_change_notify(sdata, ~0);
+ break;
+ case NL80211_IFTYPE_WDS:
+ break;
+ case NL80211_IFTYPE_AP_VLAN:
+ case NL80211_IFTYPE_MONITOR:
+ /* ignore virtual */
+ break;
+ case NL80211_IFTYPE_UNSPECIFIED:
+ case __NL80211_IFTYPE_AFTER_LAST:
+ WARN_ON(1);
+ break;
+ }
+ }
+
+ /* add back keys */
+ list_for_each_entry(sdata, &local->interfaces, list)
+ if (netif_running(sdata->dev))
+ ieee80211_enable_keys(sdata);
+
+ ieee80211_wake_queues_by_reason(hw,
+ IEEE80211_QUEUE_STOP_REASON_SUSPEND);
+
+ return 0;
+}