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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>
This commit is contained in:
Stanislaw Gruszka 2016-12-19 11:52:57 +01:00 committed by Kalle Valo
parent 31369c323b
commit c7d1c77781
4 changed files with 15 additions and 0 deletions
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4
drivers/net/wireless/ralink/rt2x00/rt2x00.h
View File

@ -833,6 +833,10 @@ 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

1
drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
View File

@ -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);

5
drivers/net/wireless/ralink/rt2x00/rt2x00link.c
View File

@ -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.
*/

5
drivers/net/wireless/ralink/rt2x00/rt2x00mac.c
View File

@ -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);