iwlagn: avoid crash if vif is not assigned

For reasons that aren't entirely clear to me,
we sometimes get here during hardware reset
without the interface being set. Don't crash,
but keep a warning.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c b/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
index 2d927a94074da155ed24e5c9be03598725567839..fbaa8d293654738c6ebcea4f1aa965172544bf95 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
@@ -507,6 +507,11 @@ void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
 
        mutex_lock(&priv->mutex);
 
+       if (WARN_ON(!ctx->vif)) {
+               mutex_unlock(&priv->mutex);
+               return;
+       }
+
        if (changes & BSS_CHANGED_BEACON_INT)
                force = true;