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@xxxxxxxxxx>
---
drivers/net/wireless/ralink/rt2x00/rt2x00.h | 4 ++++
drivers/net/wireless/ralink/rt2x00/rt2x00dev.c | 1 +
drivers/net/wireless/ralink/rt2x00/rt2x00link.c | 5 +++++
drivers/net/wireless/ralink/rt2x00/rt2x00mac.c | 5 +++++
4 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00.h b/drivers/net/wireless/ralink/rt2x00/rt2x00.h
index 01ce8a4..60dd4ac 100644
--- 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 550eaf1..e464bdc 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
@@ -1296,6 +1296,7 @@ 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
--- 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
--- 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);
--
1.7.1
