Kang Yang <quic_kangyang@xxxxxxxxxxx> writes: > From: Wen Gong <quic_wgong@xxxxxxxxxxx> > > With previous patch "wifi: ath11k: move update channel list from update > reg worker to reg notifier", ath11k_reg_update_chan_list() will be > called during reg_process_self_managed_hint(). > > reg_process_self_managed_hint() will hold rtnl_lock all the time. > But ath11k_reg_update_chan_list() may increase the occupation time of > rtnl_lock, because wait flag is set and wait_for_completion_timeout() > will be called when 11d/hw scan is running. > > Should minimize the occupation time of rtnl_lock as much as possible. > > Move update channel list operation to a new worker, so that > wait_for_completion_timeout() won't be called and will not increase the > occupation time of rtnl_lock. Maybe the last two paragraphs could be merged (and edited) like this: We should minimize the occupation time of rtnl_lock as much as possible to avoid interfering with rest of the system. So move the update channel list operation to a new worker, so that wait_for_completion_timeout() won't be called and will not increase the occupation time of rtnl_lock. > --- a/drivers/net/wireless/ath/ath11k/core.h > +++ b/drivers/net/wireless/ath/ath11k/core.h > @@ -685,7 +685,7 @@ struct ath11k { > struct mutex conf_mutex; > /* protects the radio specific data like debug stats, ppdu_stats_info stats, > * vdev_stop_status info, scan data, ath11k_sta info, ath11k_vif info, > - * channel context data, survey info, test mode data. > + * channel context data, survey info, test mode data, channel_update_queue. > */ > spinlock_t data_lock; Usually is best to add a comment the data you are protecting, in this case the new fields in struct ath11k. > @@ -743,6 +743,8 @@ struct ath11k { > struct completion bss_survey_done; > > struct work_struct regd_update_work; > + struct work_struct channel_update_work; > + struct list_head channel_update_queue; So here add '/* protected with data_lock */' or similar before channel_update_queue. > @@ -231,8 +206,16 @@ int ath11k_reg_update_chan_list(struct ath11k *ar, bool wait) > } > } > > - ret = ath11k_wmi_send_scan_chan_list_cmd(ar, params); > - kfree(params); > + if (wait) { > + spin_lock_bh(&ar->data_lock); > + list_add_tail(¶ms->list, &ar->channel_update_queue); > + spin_unlock_bh(&ar->data_lock); > + > + queue_work(ar->ab->workqueue, &ar->channel_update_work); > + } else { > + ret = ath11k_wmi_send_scan_chan_list_cmd(ar, params); > + kfree(params); > + } You can avoid the else branch like this: if (wait) { spin_lock_bh(&ar->data_lock); list_add_tail(¶ms->list, &ar->channel_update_queue); spin_unlock_bh(&ar->data_lock); queue_work(ar->ab->workqueue, &ar->channel_update_work); return 0; } ret = ath11k_wmi_send_scan_chan_list_cmd(ar, params); kfree(params); -- https://patchwork.kernel.org/project/linux-wireless/list/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches