diff options
| -rw-r--r-- | drivers/net/wireless/wl12xx/main.c | 29 | ||||
| -rw-r--r-- | drivers/net/wireless/wl12xx/wl12xx.h | 3 |
2 files changed, 28 insertions, 4 deletions
diff --git a/drivers/net/wireless/wl12xx/main.c b/drivers/net/wireless/wl12xx/main.c index 3f6517dda629..57d0af6cfa64 100644 --- a/drivers/net/wireless/wl12xx/main.c +++ b/drivers/net/wireless/wl12xx/main.c @@ -1304,6 +1304,16 @@ static int wl1271_op_add_interface(struct ieee80211_hw *hw, goto out; } + /* + * in some very corner case HW recovery scenarios its possible to + * get here before __wl1271_op_remove_interface is complete, so + * opt out if that is the case. + */ + if (test_bit(WL1271_FLAG_IF_INITIALIZED, &wl->flags)) { + ret = -EBUSY; + goto out; + } + switch (vif->type) { case NL80211_IFTYPE_STATION: wl->bss_type = BSS_TYPE_STA_BSS; @@ -1372,6 +1382,7 @@ power_off: wl->vif = vif; wl->state = WL1271_STATE_ON; + set_bit(WL1271_FLAG_IF_INITIALIZED, &wl->flags); wl1271_info("firmware booted (%s)", wl->chip.fw_ver_str); /* update hw/fw version info in wiphy struct */ @@ -1409,14 +1420,16 @@ static void __wl1271_op_remove_interface(struct wl1271 *wl) wl1271_debug(DEBUG_MAC80211, "mac80211 remove interface"); + /* because of hardware recovery, we may get here twice */ + if (wl->state != WL1271_STATE_ON) + return; + wl1271_info("down"); mutex_lock(&wl_list_mutex); list_del(&wl->list); mutex_unlock(&wl_list_mutex); - WARN_ON(wl->state != WL1271_STATE_ON); - /* enable dyn ps just in case (if left on due to fw crash etc) */ if (wl->bss_type == BSS_TYPE_STA_BSS) ieee80211_enable_dyn_ps(wl->vif); @@ -1428,6 +1441,10 @@ static void __wl1271_op_remove_interface(struct wl1271 *wl) ieee80211_scan_completed(wl->hw, true); } + /* + * this must be before the cancel_work calls below, so that the work + * functions don't perform further work. + */ wl->state = WL1271_STATE_OFF; mutex_unlock(&wl->mutex); @@ -1464,7 +1481,6 @@ static void __wl1271_op_remove_interface(struct wl1271 *wl) wl->time_offset = 0; wl->session_counter = 0; wl->rate_set = CONF_TX_RATE_MASK_BASIC; - wl->flags = 0; wl->vif = NULL; wl->filters = 0; wl1271_free_ap_keys(wl); @@ -1473,6 +1489,13 @@ static void __wl1271_op_remove_interface(struct wl1271 *wl) wl->ap_ps_map = 0; wl->block_size = 0; + /* + * this is performed after the cancel_work calls and the associated + * mutex_lock, so that wl1271_op_add_interface does not accidentally + * get executed before all these vars have been reset. + */ + wl->flags = 0; + for (i = 0; i < NUM_TX_QUEUES; i++) wl->tx_blocks_freed[i] = 0; diff --git a/drivers/net/wireless/wl12xx/wl12xx.h b/drivers/net/wireless/wl12xx/wl12xx.h index ba98e1853842..c12945958848 100644 --- a/drivers/net/wireless/wl12xx/wl12xx.h +++ b/drivers/net/wireless/wl12xx/wl12xx.h @@ -354,7 +354,8 @@ enum wl12xx_flags { WL1271_FLAG_PSPOLL_FAILURE, WL1271_FLAG_STA_STATE_SENT, WL1271_FLAG_FW_TX_BUSY, - WL1271_FLAG_AP_STARTED + WL1271_FLAG_AP_STARTED, + WL1271_FLAG_IF_INITIALIZED, }; struct wl1271_link { |
