[PATCH RFC v3 3/6] wifi: ath12k: switch to using wiphy_lock() and remove ar->conf_mutex

[Kalle Valo]

Kalle Valo <kvalo at kernel.org> writes:

> From: Kalle Valo <quic_kvalo at quicinc.com>
>
> Switch from using driver specific ar->conf_mutex to wiphy->mtx. The benefits are:
>
> * one lock less and simplified locking
>
> * possibility to use wiphy_work_queue() without other locks
>
> Most of the mac80211 ops are called within wiphy_lock(), most notable exception
> being tx op. This can be checked with lockdep_assert_wiphy() from
> net/mac80211/driver-ops.[ch] and I veried that by manually going through all
> the ops in ath12k_ops which had lockdep_assert_wiphy().
>
> The conversion was simple:
>
> * All conf_mutex lock() and unlock() calls which
>   already were called under wiphy_lock() I replaced with
>   lockdep_assert_wiphy().
>
> * The rest of conf_mutex calls I replaced with wiphy_lock() and wiphy_unlock().
>
> * All lockdep_asset_held(conf_mutex) calls I replaced with
>   lockdep_assert_wiphy().
>
> One exception was in ath12k_core_post_reconfigure_recovery() where the wiphy
> lock needs to be taken before hw_mutex to avoid a lockdep warning.
>
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
>
> Signed-off-by: Kalle Valo <quic_kvalo at quicinc.com>

[...]

> @@ -6432,7 +6411,8 @@ static int ath12k_mac_vdev_create(struct ath12k *ar, struct ieee80211_vif *vif)
>  	int i;
>  	int ret, vdev_id;
>  
> -	lockdep_assert_held(&ar->conf_mutex);
> +	lockdep_assert_wiphy(ath12k_ar_to_hw(ar)->wiphy);
> +	lockdep_assert_wiphy(hw->wiphy);

The assert is twice, I'll fix that in v3.

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