Hi Bryan,
On Tue, 1 Jun 2021 at 04:47, Bryan O'Donoghue
<bryan.odonoghue@xxxxxxxxxx> 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@xxxxxxxxxx>
> Tested-by: Benjamin Li <benl@xxxxxxxxxxxx>
> ---
> 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
