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mac80211: allow driver to return error from sched_scan_stop

Browse source 
In order to solve races with sched_scan_stop, it is necessary
for the driver to be able to return an error to propagate that
to cfg80211 so it doesn't send an event.

Reviewed-by: Alexander Bondar <alexander.bondar@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2014-02-17 10:48:17 +01:00
parent d9b8396a52
commit 37e3308cb2
5 changed files with 19 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

6
drivers/net/wireless/iwlwifi/mvm/mac80211.c
View file

@ -1746,14 +1746,16 @@ out:
return ret; return ret;
} }
static void iwl_mvm_mac_sched_scan_stop(struct ieee80211_hw *hw, static int iwl_mvm_mac_sched_scan_stop(struct ieee80211_hw *hw,
struct ieee80211_vif *vif) struct ieee80211_vif *vif)
{ {
struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
mutex_lock(&mvm->mutex); mutex_lock(&mvm->mutex);
iwl_mvm_sched_scan_stop(mvm); iwl_mvm_sched_scan_stop(mvm);
mutex_unlock(&mvm->mutex); mutex_unlock(&mvm->mutex);
return 0;
} }
static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw, static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw,

6
drivers/net/wireless/ti/wlcore/main.c
View file

@ -3668,8 +3668,8 @@ out:
return ret; return ret;
} }
static void wl1271_op_sched_scan_stop(struct ieee80211_hw *hw, static int wl1271_op_sched_scan_stop(struct ieee80211_hw *hw,
struct ieee80211_vif *vif) struct ieee80211_vif *vif)
{ {
struct wl1271 *wl = hw->priv; struct wl1271 *wl = hw->priv;
struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif); struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
@ -3691,6 +3691,8 @@ static void wl1271_op_sched_scan_stop(struct ieee80211_hw *hw,
wl1271_ps_elp_sleep(wl); wl1271_ps_elp_sleep(wl);
out: out:
mutex_unlock(&wl->mutex); mutex_unlock(&wl->mutex);
return 0;
} }
static int wl1271_op_set_frag_threshold(struct ieee80211_hw *hw, u32 value) static int wl1271_op_set_frag_threshold(struct ieee80211_hw *hw, u32 value)

3
include/net/mac80211.h
View file

@ -2460,6 +2460,7 @@ enum ieee80211_roc_type {
* This process will continue until sched_scan_stop is called. * This process will continue until sched_scan_stop is called.
* *
* @sched_scan_stop: Tell the hardware to stop an ongoing scheduled scan. * @sched_scan_stop: Tell the hardware to stop an ongoing scheduled scan.
* In this case, ieee80211_sched_scan_stopped() must not be called.
* *
* @sw_scan_start: Notifier function that is called just before a software scan * @sw_scan_start: Notifier function that is called just before a software scan
* is started. Can be NULL, if the driver doesn't need this notification. * is started. Can be NULL, if the driver doesn't need this notification.
@ -2807,7 +2808,7 @@ struct ieee80211_ops {
struct ieee80211_vif *vif, struct ieee80211_vif *vif,
struct cfg80211_sched_scan_request *req, struct cfg80211_sched_scan_request *req,
struct ieee80211_sched_scan_ies *ies); struct ieee80211_sched_scan_ies *ies);
void (*sched_scan_stop)(struct ieee80211_hw *hw, int (*sched_scan_stop)(struct ieee80211_hw *hw,
struct ieee80211_vif *vif); struct ieee80211_vif *vif);
void (*sw_scan_start)(struct ieee80211_hw *hw); void (*sw_scan_start)(struct ieee80211_hw *hw);
void (*sw_scan_complete)(struct ieee80211_hw *hw); void (*sw_scan_complete)(struct ieee80211_hw *hw);

12
net/mac80211/driver-ops.h
View file

@ -354,16 +354,20 @@ drv_sched_scan_start(struct ieee80211_local *local,
return ret; return ret;
} }
static inline void drv_sched_scan_stop(struct ieee80211_local *local, static inline int drv_sched_scan_stop(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata) struct ieee80211_sub_if_data *sdata)
{ {
int ret;
might_sleep(); might_sleep();
check_sdata_in_driver(sdata); check_sdata_in_driver(sdata);
trace_drv_sched_scan_stop(local, sdata); trace_drv_sched_scan_stop(local, sdata);
local->ops->sched_scan_stop(&local->hw, &sdata->vif); ret = local->ops->sched_scan_stop(&local->hw, &sdata->vif);
trace_drv_return_void(local); trace_drv_return_int(local, ret);
return ret;
} }
static inline void drv_sw_scan_start(struct ieee80211_local *local) static inline void drv_sw_scan_start(struct ieee80211_local *local)

2
net/mac80211/scan.c
View file

@ -1056,7 +1056,7 @@ int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata)
local->sched_scan_req = NULL; local->sched_scan_req = NULL;
if (rcu_access_pointer(local->sched_scan_sdata)) if (rcu_access_pointer(local->sched_scan_sdata))
drv_sched_scan_stop(local, sdata); ret = drv_sched_scan_stop(local, sdata);
out: out:
mutex_unlock(&local->mtx); mutex_unlock(&local->mtx);