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@xxxxxxxxxxxxxxx
Signed-off-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
---
drivers/net/wireless/iwlwifi/iwl-agn.c | 3 ---
drivers/net/wireless/iwlwifi/iwl-mac80211.c | 10 +++++++++-
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 28422c0..6375e5a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -862,7 +862,6 @@ 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;
@@ -871,8 +870,6 @@ 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;
/*
diff --git a/drivers/net/wireless/iwlwifi/iwl-mac80211.c b/drivers/net/wireless/iwlwifi/iwl-mac80211.c
index 9212ee3..4e8786d 100644
--- a/drivers/net/wireless/iwlwifi/iwl-mac80211.c
+++ b/drivers/net/wireless/iwlwifi/iwl-mac80211.c
@@ -1241,6 +1241,7 @@ 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);
@@ -1262,6 +1263,13 @@ 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)) {
@@ -1288,7 +1296,7 @@ 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;
--
1.7.1
--
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