rt2x00: add mutex to synchronize config and link tuner

Do not perform mac80211 config and link_tuner at the same time,
this can possibly result in wrong RF or BBP configuration.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00.h b/drivers/net/wireless/ralink/rt2x00/rt2x00.h
index 92bb8be..034a072 100644 (file)
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00.h
@@ -834,6 +834,10 @@ struct rt2x00_dev {
        struct mutex csr_mutex;
 
        /*
+        * Mutex to synchronize config and link tuner.
+        */
+       struct mutex conf_mutex;
+       /*
         * Current packet filter configuration for the device.
         * This contains all currently active FIF_* flags send
         * to us by mac80211 during configure_filter().

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c b/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
index 6afd215..8fcbc8d 100644 (file)
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
@@ -1313,6 +1313,7 @@ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 
        spin_lock_init(&rt2x00dev->irqmask_lock);
        mutex_init(&rt2x00dev->csr_mutex);
+       mutex_init(&rt2x00dev->conf_mutex);
        INIT_LIST_HEAD(&rt2x00dev->bar_list);
        spin_lock_init(&rt2x00dev->bar_list_lock);
 

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00link.c b/drivers/net/wireless/ralink/rt2x00/rt2x00link.c
index 73cbf23..2010a77 100644 (file)
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00link.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00link.c
@@ -363,6 +363,9 @@ static void rt2x00link_tuner(struct work_struct *work)
            test_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags))
                return;
 
+       /* Do not race with rt2x00mac_config(). */
+       mutex_lock(&rt2x00dev->conf_mutex);
+
        if (rt2x00dev->intf_sta_count)
                rt2x00link_tuner_sta(rt2x00dev, link);
 
@@ -375,6 +378,8 @@ static void rt2x00link_tuner(struct work_struct *work)
            (link->count % (VCO_SECONDS / LINK_TUNE_SECONDS)) == 0)
                rt2x00dev->ops->lib->vco_calibration(rt2x00dev);
 
+       mutex_unlock(&rt2x00dev->conf_mutex);
+
        /*
         * Increase tuner counter, and reschedule the next link tuner run.
         */

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00mac.c b/drivers/net/wireless/ralink/rt2x00/rt2x00mac.c
index d4b50fb..3cc1384 100644 (file)
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00mac.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00mac.c
@@ -320,6 +320,9 @@ int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
         */
        rt2x00queue_stop_queue(rt2x00dev->rx);
 
+       /* Do not race with with link tuner. */
+       mutex_lock(&rt2x00dev->conf_mutex);
+
        /*
         * When we've just turned on the radio, we want to reprogram
         * everything to ensure a consistent state
@@ -335,6 +338,8 @@ int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
         */
        rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
 
+       mutex_unlock(&rt2x00dev->conf_mutex);
+
        /* Turn RX back on */
        rt2x00queue_start_queue(rt2x00dev->rx);