rt2x00: Force full register config after start()

rt2x00 will only perform configuration changes from
mac80211 when the configuration option has changed.
This means it keeps track of the current active configuration
and will check these values when the config() callback function
is used.

However this causes breakage when the interface has been
brought down and up again, since all stored active values
aren't reset while the registers might have.
This is for example the case with rt61pci antenna registers which
will jump to invalid values when the interface has been started.

To make sure a full configuration takes place after the start()
callback function, a new flag is added which will be checked
during config() and skips the "what's changed" phase.

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

diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 73495f0ee139ff38a342bee64d3d16e143c7eeba..db2dc976d831cdafa75fb060b0576e301dc78bcb 100644 (file)
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -600,6 +600,7 @@ enum rt2x00_flags {
        DEVICE_STARTED_SUSPEND,
        DEVICE_ENABLED_RADIO,
        DEVICE_DISABLED_RADIO_HW,
+       DEVICE_DIRTY_CONFIG,
 
        /*
         * Driver features

diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 8c93eb8353b0bc4c2b49d47926b5357263ab20ec..f42283ad7b023b697e4aa9375b5c01557ae54f2b 100644 (file)
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -1013,6 +1013,7 @@ int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
        rt2x00dev->intf_associated = 0;
 
        __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
+       __set_bit(DEVICE_DIRTY_CONFIG, &rt2x00dev->flags);
 
        return 0;
 }
@@ -1237,9 +1238,9 @@ int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
        /*
         * Reconfigure device.
         */
-       rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
-       if (!rt2x00dev->hw->conf.radio_enabled)
-               rt2x00lib_disable_radio(rt2x00dev);
+       retval = rt2x00mac_config(rt2x00dev->hw, &rt2x00dev->hw->conf);
+       if (retval)
+               goto exit;
 
        /*
         * Iterator over each active interface to

diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c
index 1f83d5fbf6b018494a1cca0a087b6002f684ea00..042ab00d8bd213beaa803a36dcac49ddc21dc335 100644 (file)
--- a/drivers/net/wireless/rt2x00/rt2x00mac.c
+++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
@@ -310,6 +310,7 @@ EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
 {
        struct rt2x00_dev *rt2x00dev = hw->priv;
+       int force_reconfig;
 
        /*
         * Mac80211 might be calling this function while we are trying
@@ -329,7 +330,17 @@ int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
                        rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
        }
 
-       rt2x00lib_config(rt2x00dev, conf, 0);
+       /*
+        * When the DEVICE_DIRTY_CONFIG flag is set, the device has recently
+        * been started and the configuration must be forced upon the hardware.
+        * Otherwise registers will not be intialized correctly and could
+        * result in non-working hardware because essential registers aren't
+        * initialized.
+        */
+       force_reconfig =
+           __test_and_clear_bit(DEVICE_DIRTY_CONFIG, &rt2x00dev->flags);
+
+       rt2x00lib_config(rt2x00dev, conf, force_reconfig);
 
        /*
         * Reenable RX only if the radio should be on.