提交 8db4c7e2 编写于 作者: S Stanislaw Gruszka 提交者: John W. Linville

iwlwifi: do not nulify ctx->vif on reset

ctx->vif is dereferenced in different part of iwlwifi code, so do not
nullify it.

This should address at least one of the possible reasons of WARNING at
iwlagn_mac_remove_interface, and perhaps some random crashes when
firmware reset is performed.

Cc: stable@vger.kernel.org
Signed-off-by: NStanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: NWey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
上级 83722bd4
......@@ -863,7 +863,6 @@ static void iwl_bg_run_time_calib_work(struct work_struct *work)
void iwlagn_prepare_restart(struct iwl_priv *priv)
{
struct iwl_rxon_context *ctx;
bool bt_full_concurrent;
u8 bt_ci_compliance;
u8 bt_load;
......@@ -872,8 +871,6 @@ void iwlagn_prepare_restart(struct iwl_priv *priv)
lockdep_assert_held(&priv->mutex);
for_each_context(priv, ctx)
ctx->vif = NULL;
priv->is_open = 0;
/*
......
......@@ -1244,6 +1244,7 @@ static int iwlagn_mac_add_interface(struct ieee80211_hw *hw,
struct iwl_rxon_context *tmp, *ctx = NULL;
int err;
enum nl80211_iftype viftype = ieee80211_vif_type_p2p(vif);
bool reset = false;
IWL_DEBUG_MAC80211(priv, "enter: type %d, addr %pM\n",
viftype, vif->addr);
......@@ -1265,6 +1266,13 @@ static int iwlagn_mac_add_interface(struct ieee80211_hw *hw,
tmp->interface_modes | tmp->exclusive_interface_modes;
if (tmp->vif) {
/* On reset we need to add the same interface again */
if (tmp->vif == vif) {
reset = true;
ctx = tmp;
break;
}
/* check if this busy context is exclusive */
if (tmp->exclusive_interface_modes &
BIT(tmp->vif->type)) {
......@@ -1291,7 +1299,7 @@ static int iwlagn_mac_add_interface(struct ieee80211_hw *hw,
ctx->vif = vif;
err = iwl_setup_interface(priv, ctx);
if (!err)
if (!err || reset)
goto out;
ctx->vif = NULL;
......
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