rt2x00: Check for specific changed flags when updating the erp config

Previously rt2x00 was always updating all erp related config variables
even though mac80211 might only have changed one. Hence, pass the
changed flags to the config_erp driver callback so that the driver
can limit the changes to the correct values.

This fixes an issue in AP mode where the beacon interval is not
initialized (and thus zero) but still sent to the hardware causing an
interrupt storm on rt2800pci hanging the system.

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

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c
index 235e037e6509..7862a840984a 100644
--- a/drivers/net/wireless/rt2x00/rt2x00mac.c
+++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
@@ -669,8 +669,10 @@ void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
          * When the erp information has changed, we should perform
          * additional configuration steps. For all other changes we are done.
          */
-        if (changes & ~(BSS_CHANGED_ASSOC | BSS_CHANGED_HT))
-                rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
+        if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
+                       BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
+                       BSS_CHANGED_BEACON_INT))
+                rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);