[PATCH mt76 6/6] wifi: mt76: mt7996: fix issues with manually triggered radar detection

[Lorenzo Bianconi]

> From: StanleyYP Wang <StanleyYP.Wang at mediatek.com>
> 
> Disallow triggering radar detection on non-DFS channels to prevent paused
> TX queues from failing to resume, as a channel switch is not performed in
> this case.

I guess we are missing a Fixes tag here.

> 
> Signed-off-by: StanleyYP Wang <StanleyYP.Wang at mediatek.com>
> Signed-off-by: Shayne Chen <shayne.chen at mediatek.com>
> ---
>  .../wireless/mediatek/mt76/mt7996/debugfs.c   | 22 +++++++++++++++----
>  1 file changed, 18 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c b/drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c
> index 76d623b2cafb..e26bed6b97e7 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c
> @@ -226,14 +226,23 @@ mt7996_radar_trigger(void *data, u64 val)
>  #define RADAR_BACKGROUND	2
>  	struct mt7996_dev *dev = data;
>  	struct mt7996_phy *phy = mt7996_band_phy(dev, NL80211_BAND_5GHZ);
> -	int rdd_idx;
> +	struct cfg80211_chan_def *chandef;
> +	int rdd_idx, ret;
>  
>  	if (!phy || !val || val > RADAR_BACKGROUND)
>  		return -EINVAL;
>  
> -	if (val == RADAR_BACKGROUND && !dev->rdd2_phy) {
> -		dev_err(dev->mt76.dev, "Background radar is not enabled\n");
> -		return -EINVAL;
> +	if (test_bit(MT76_SCANNING, &phy->mt76->state))
> +		return -EBUSY;
> +
> +	if (val == RADAR_BACKGROUND) {
> +		if (!dev->rdd2_phy || !cfg80211_chandef_valid(&dev->rdd2_chandef)) {
> +			dev_err(dev->mt76.dev, "Background radar is not enabled\n");

nit: I guess it is better to specify a different error message if rdd2_chandef
is  invalid.

Regards,
Lorenzo

> +			return -EINVAL;
> +		}
> +		chandef = &dev->rdd2_chandef;
> +	} else {
> +		chandef = &phy->mt76->chandef;
>  	}
>  
>  	rdd_idx = mt7996_get_rdd_idx(phy, val == RADAR_BACKGROUND);
> @@ -242,6 +251,11 @@ mt7996_radar_trigger(void *data, u64 val)
>  		return -EINVAL;
>  	}
>  
> +	ret = cfg80211_chandef_dfs_required(dev->mt76.hw->wiphy, chandef,
> +					    NL80211_IFTYPE_AP);
> +	if (ret <= 0)
> +		return ret;
> +
>  	return mt7996_mcu_rdd_cmd(dev, RDD_RADAR_EMULATE, rdd_idx, 0);
>  }
>  
> -- 
> 2.51.0
> 
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