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iwlwifi: mvm: change scan timeout to a delayed work 

Some transports may sleep when writing to registers, which is done
when calling iwl_force_nmi().  So we can't call iwl_force_nmi() in a
timer context.  To solve that, convert the scan timeout timer to a
delayed work.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Luca Coelho 2016-05-03 12:18:33 +03:00
parent f43495fd5e
commit 69e046423a
4 changed files with 14 additions and 15 deletions
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1
drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
View File

@ -1200,6 +1200,7 @@ static void iwl_mvm_mac_stop(struct ieee80211_hw *hw)
flush_work(&mvm->add_stream_wk);
cancel_delayed_work_sync(&mvm->fw_dump_wk);
cancel_delayed_work_sync(&mvm->cs_tx_unblock_dwork);
cancel_delayed_work_sync(&mvm->scan_timeout_dwork);
iwl_mvm_free_fw_dump_desc(mvm);
mutex_lock(&mvm->mutex);

4
drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
View File

@ -802,7 +802,7 @@ struct iwl_mvm {
struct iwl_mcast_filter_cmd *mcast_filter_cmd;
enum iwl_mvm_scan_type scan_type;
enum iwl_mvm_sched_scan_pass_all_states sched_scan_pass_all;
struct timer_list scan_timer;
struct delayed_work scan_timeout_dwork;
/* max number of simultaneous scans the FW supports */
unsigned int max_scans;
@ -1415,7 +1415,7 @@ int iwl_mvm_scan_size(struct iwl_mvm *mvm);
int iwl_mvm_scan_stop(struct iwl_mvm *mvm, int type, bool notify);
int iwl_mvm_max_scan_ie_len(struct iwl_mvm *mvm);
void iwl_mvm_report_scan_aborted(struct iwl_mvm *mvm);
void iwl_mvm_scan_timeout(unsigned long data);
void iwl_mvm_scan_timeout_wk(struct work_struct *work);
/* Scheduled scan */
void iwl_mvm_rx_lmac_scan_complete_notif(struct iwl_mvm *mvm,

6
drivers/net/wireless/intel/iwlwifi/mvm/ops.c
View File

@ -608,6 +608,7 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
INIT_WORK(&mvm->d0i3_exit_work, iwl_mvm_d0i3_exit_work);
INIT_DELAYED_WORK(&mvm->fw_dump_wk, iwl_mvm_fw_error_dump_wk);
INIT_DELAYED_WORK(&mvm->tdls_cs.dwork, iwl_mvm_tdls_ch_switch_work);
INIT_DELAYED_WORK(&mvm->scan_timeout_dwork, iwl_mvm_scan_timeout_wk);
INIT_WORK(&mvm->add_stream_wk, iwl_mvm_add_new_dqa_stream_wk);
spin_lock_init(&mvm->d0i3_tx_lock);
@ -766,9 +767,6 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
iwl_mvm_tof_init(mvm);
setup_timer(&mvm->scan_timer, iwl_mvm_scan_timeout,
(unsigned long)mvm);
return op_mode;
out_unregister:
@ -822,8 +820,6 @@ static void iwl_op_mode_mvm_stop(struct iwl_op_mode *op_mode)
iwl_mvm_tof_clean(mvm);
del_timer_sync(&mvm->scan_timer);
mutex_destroy(&mvm->mutex);
mutex_destroy(&mvm->d0i3_suspend_mutex);

18
drivers/net/wireless/intel/iwlwifi/mvm/scan.c
View File

@ -399,7 +399,7 @@ void iwl_mvm_rx_lmac_scan_complete_notif(struct iwl_mvm *mvm,
ieee80211_scan_completed(mvm->hw,
scan_notif->status == IWL_SCAN_OFFLOAD_ABORTED);
iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
del_timer(&mvm->scan_timer);
cancel_delayed_work(&mvm->scan_timeout_dwork);
} else {
IWL_ERR(mvm,
"got scan complete notification but no scan is running\n");
@ -1222,15 +1222,16 @@ static int iwl_mvm_check_running_scans(struct iwl_mvm *mvm, int type)
return -EIO;
}
#define SCAN_TIMEOUT (16 * HZ)
#define SCAN_TIMEOUT 20000
void iwl_mvm_scan_timeout(unsigned long data)
void iwl_mvm_scan_timeout_wk(struct work_struct *work)
{
struct iwl_mvm *mvm = (struct iwl_mvm *)data;
struct delayed_work *delayed_work = to_delayed_work(work);
struct iwl_mvm *mvm = container_of(delayed_work, struct iwl_mvm,
scan_timeout_dwork);
IWL_ERR(mvm, "regular scan timed out\n");
del_timer(&mvm->scan_timer);
iwl_force_nmi(mvm->trans);
}
@ -1313,7 +1314,8 @@ int iwl_mvm_reg_scan_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
mvm->scan_status |= IWL_MVM_SCAN_REGULAR;
iwl_mvm_ref(mvm, IWL_MVM_REF_SCAN);
mod_timer(&mvm->scan_timer, jiffies + SCAN_TIMEOUT);
queue_delayed_work(system_wq, &mvm->scan_timeout_dwork,
msecs_to_jiffies(SCAN_TIMEOUT));
return 0;
}
@ -1432,7 +1434,7 @@ void iwl_mvm_rx_umac_scan_complete_notif(struct iwl_mvm *mvm,
if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_REGULAR) {
ieee80211_scan_completed(mvm->hw, aborted);
iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
del_timer(&mvm->scan_timer);
cancel_delayed_work(&mvm->scan_timeout_dwork);
} else if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_SCHED) {
ieee80211_sched_scan_stopped(mvm->hw);
mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_DISABLED;
@ -1628,7 +1630,7 @@ out:
* to release the scan reference here.
*/
iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
del_timer(&mvm->scan_timer);
cancel_delayed_work(&mvm->scan_timeout_dwork);
if (notify)
ieee80211_scan_completed(mvm->hw, true);
} else if (notify) {