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References: <20210601024920.1424144-1-bryan.odonoghue@linaro.org> <20210601024920.1424144-3-bryan.odonoghue@linaro.org>
In-Reply-To: <20210601024920.1424144-3-bryan.odonoghue@linaro.org>
From:   Loic Poulain <loic.poulain@linaro.org>
Date:   Tue, 1 Jun 2021 09:09:19 +0200
Message-ID: <CAMZdPi9VOPdz_4nhjDC1o49eobRPZRkniKtWc4ZLOiGEH3nP6w@mail.gmail.com>
Subject: Re: [PATCH v4 02/12] wcn36xx: Run suspend for the first ieee80211_vif
To:     "Bryan O'Donoghue" <bryan.odonoghue@linaro.org>
Cc:     Kalle Valo <kvalo@codeaurora.org>, wcn36xx@lists.infradead.org,
        linux-wireless@vger.kernel.org, Shawn Guo <shawn.guo@linaro.org>,
        Benjamin Li <benl@squareup.com>,
        Bjorn Andersson <bjorn.andersson@linaro.org>
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Precedence: bulk

Hi Bryan,

On Tue, 1 Jun 2021 at 04:47, Bryan O'Donoghue
<bryan.odonoghue@linaro.org> wrote:
>
> A subsequent set of patches will extend out suspend/resume support in this
> driver, we cannot set the firmware up for multiple ipv4/ipv6 addresses and
> as such we can't iterate through a list of ieee80211_vif.
>
> Constrain the interaction with the firmware to the first ieee80211_vif on
> the suspend/resume/wowlan path.
>
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
> Tested-by: Benjamin Li <benl@squareup.com>
> ---
>  drivers/net/wireless/ath/wcn36xx/main.c | 30 ++++++++++++++++++++++---
>  1 file changed, 27 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
> index b361e40697a6..6802dce2a02b 100644
> --- a/drivers/net/wireless/ath/wcn36xx/main.c
> +++ b/drivers/net/wireless/ath/wcn36xx/main.c
> @@ -1088,15 +1088,34 @@ static int wcn36xx_sta_remove(struct ieee80211_hw *hw,
>
>  #ifdef CONFIG_PM
>
> +static struct ieee80211_vif *wcn36xx_get_first_assoc_vif(struct wcn36xx *wcn)
> +{
> +       struct wcn36xx_vif *vif_priv = NULL;
> +       struct ieee80211_vif *vif = NULL;
> +
> +       list_for_each_entry(vif_priv, &wcn->vif_list, list) {
> +               if (vif_priv->sta_assoc) {
> +                       vif = wcn36xx_priv_to_vif(vif_priv);
> +                       break;
> +               }
> +       }
> +       return vif;
> +}
> +
>  static int wcn36xx_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wow)
>  {
>         struct wcn36xx *wcn = hw->priv;
> -       int ret;
> +       struct ieee80211_vif *vif = NULL;
> +       int ret = 0;
>
>         wcn36xx_dbg(WCN36XX_DBG_MAC, "mac suspend\n");
>
>         flush_workqueue(wcn->hal_ind_wq);
> -       ret = wcn36xx_smd_set_power_params(wcn, true);
> +       mutex_lock(&wcn->conf_mutex);
> +       vif = wcn36xx_get_first_assoc_vif(wcn);
> +       if (vif)
> +               ret = wcn36xx_smd_set_power_params(wcn, true);
> +       mutex_unlock(&wcn->conf_mutex);
>
>         return ret;
>  }
> @@ -1104,11 +1123,16 @@ static int wcn36xx_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wow)
>  static int wcn36xx_resume(struct ieee80211_hw *hw)
>  {
>         struct wcn36xx *wcn = hw->priv;
> +       struct ieee80211_vif *vif = NULL;
>
>         wcn36xx_dbg(WCN36XX_DBG_MAC, "mac resume\n");
>
>         flush_workqueue(wcn->hal_ind_wq);
> -       wcn36xx_smd_set_power_params(wcn, false);
> +       mutex_lock(&wcn->conf_mutex);
> +       vif = wcn36xx_get_first_assoc_vif(wcn);
> +       if (vif)
> +               wcn36xx_smd_set_power_params(wcn, false);
> +

Where is the balanced mutex_unlock?

>         return 0;
>  }

Regards,
Loic