[PATCH] mt76: mac: run mt76x02_mac_work routine atomically

[Lorenzo Bianconi]

Grab mt76_dev mutex in mt76x02_mac_work handler since it runs
concurrently with mt76x{0,2}_set_channel routines

Signed-off-by: Lorenzo Bianconi <lorenzo.bianc...@redhat.com>
---
 drivers/net/wireless/mediatek/mt76/mt76x02_mac.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c 
b/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c
index 490368dc9325..64841f40cdcf 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c
@@ -784,6 +784,8 @@ void mt76x02_mac_work(struct work_struct *work)
                                               mac_work.work);
        int i, idx;
 
+       mutex_lock(&dev->mt76.mutex);
+
        mt76x02_update_channel(&dev->mt76);
        for (i = 0, idx = 0; i < 16; i++) {
                u32 val = mt76_rr(dev, MT_TX_AGG_CNT(i));
@@ -796,6 +798,8 @@ void mt76x02_mac_work(struct work_struct *work)
        if (!dev->beacon_mask)
                mt76x02_check_mac_err(dev);
 
+       mutex_unlock(&dev->mt76.mutex);
+
        mt76_tx_status_check(&dev->mt76, NULL, false);
 
        ieee80211_queue_delayed_work(mt76_hw(dev), &dev->mac_work,
-- 
2.19.2