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iwlagn: fix race condition when reprogram sta

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During reprogram stations, do not send link quality command.
uCode will crash if receive link quality command for invalid station

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
This commit is contained in:
Wey-Yi Guy 2010-11-17 14:17:53 -08:00
parent 61790c5f3c
commit 40b97c2fe9
1 changed files with 13 additions and 0 deletions
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13
drivers/net/wireless/iwlwifi/iwl-sta.c
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@ -647,6 +647,7 @@ void iwl_reprogram_ap_sta(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
memcpy(&lq, priv->stations[sta_id].lq, sizeof(lq));
active = priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE;
priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
spin_unlock_irqrestore(&priv->sta_lock, flags);
if (active) {
@ -657,6 +658,10 @@ void iwl_reprogram_ap_sta(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
IWL_ERR(priv, "failed to remove STA %pM (%d)\n",
priv->stations[sta_id].sta.sta.addr, ret);
}
spin_lock_irqsave(&priv->sta_lock, flags);
priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
spin_unlock_irqrestore(&priv->sta_lock, flags);
ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
if (ret)
IWL_ERR(priv, "failed to re-add STA %pM (%d)\n",
@ -777,6 +782,14 @@ int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
return -EINVAL;
spin_lock_irqsave(&priv->sta_lock, flags_spin);
if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
return -EINVAL;
}
spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
iwl_dump_lq_cmd(priv, lq);
BUG_ON(init && (cmd.flags & CMD_ASYNC));