diff options
author | Juuso Oikarinen <juuso.oikarinen@nokia.com> | 2011-05-02 12:42:36 +0800 |
---|---|---|
committer | Andy Green <andy.green@linaro.org> | 2011-05-02 12:42:36 +0800 |
commit | faff5457a0e9d3cd728a7acb021136324dca990c (patch) | |
tree | 71f485e21ad0bf0ff7c212054259ae3688d8b08b /drivers/net/wireless/wl12xx/main.c | |
parent | e2aee203d2fd5a5fb91a0ab2299e7732d3cb812a (diff) |
wl12xx: Handle duplicate calling of remove interface
Because of the hardware recovery mechanism, its possible the
__wl1271_op_remove_interface is called twice. Currently, this leads to a
kernel crash even before a kernel WARNing can be issued.
Fix this.
Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
Diffstat (limited to 'drivers/net/wireless/wl12xx/main.c')
-rw-r--r-- | drivers/net/wireless/wl12xx/main.c | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/drivers/net/wireless/wl12xx/main.c b/drivers/net/wireless/wl12xx/main.c index 2a821f22915..af7ecc69d98 100644 --- a/drivers/net/wireless/wl12xx/main.c +++ b/drivers/net/wireless/wl12xx/main.c @@ -1306,6 +1306,16 @@ 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; @@ -1374,6 +1384,7 @@ 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 */ @@ -1411,14 +1422,16 @@ 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); @@ -1430,6 +1443,10 @@ 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); @@ -1466,7 +1483,6 @@ 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); @@ -1475,6 +1491,13 @@ 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; |