From f4d6082d53c588036a1c37891cb7d65088be13f5 Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Wed, 5 Mar 2008 11:31:00 -0800 Subject: [PATCH] iwlwifi: fix locking unbalance in 4965 rate scale This patch fixes locking unbalance after adding rcu locking for sta Signed-off-by: Tomas Winkler Signed-off-by: Reinette Chatre Signed-off-by: John W. Linville --- drivers/net/wireless/iwlwifi/iwl-4965-rs.c | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-4965-rs.c b/drivers/net/wireless/iwlwifi/iwl-4965-rs.c index 306fbdc..25e7386 100644 --- a/drivers/net/wireless/iwlwifi/iwl-4965-rs.c +++ b/drivers/net/wireless/iwlwifi/iwl-4965-rs.c @@ -852,19 +852,18 @@ static void rs_tx_status(void *priv_rate, struct net_device *dev, sta = sta_info_get(local, hdr->addr1); - if (!sta || !sta->rate_ctrl_priv) { - rcu_read_unlock(); - return; - } + if (!sta || !sta->rate_ctrl_priv) + goto out; + lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv; if (!priv->lq_mngr.lq_ready) - return; + goto out; if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq_sta->ibss_sta_added) - return; + goto out; table = &lq_sta->lq; active_index = lq_sta->active_tbl; @@ -915,8 +914,7 @@ static void rs_tx_status(void *priv_rate, struct net_device *dev, tx_resp->control.tx_rate->bitrate)) { IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_mcs.rate_n_flags); - rcu_read_unlock(); - return; + goto out; } /* Update frame history window with "failure" for each Tx retry. */ @@ -1025,6 +1023,7 @@ static void rs_tx_status(void *priv_rate, struct net_device *dev, /* See if there's a better rate or modulation mode to try. */ rs_rate_scale_perform(priv, dev, hdr, sta); +out: rcu_read_unlock(); return; } @@ -2229,8 +2228,7 @@ static void rs_get_rate(void *priv_rate, struct net_device *dev, if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) || !sta || !sta->rate_ctrl_priv) { sel->rate = rate_lowest(local, sband, sta); - rcu_read_unlock(); - return; + goto out; } lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv; @@ -2257,14 +2255,15 @@ static void rs_get_rate(void *priv_rate, struct net_device *dev, goto done; } - done: +done: if ((i < 0) || (i > IWL_RATE_COUNT)) { sel->rate = rate_lowest(local, sband, sta); - return; + goto out; } - rcu_read_unlock(); sel->rate = &priv->ieee_rates[i]; +out: + rcu_read_unlock(); } static void *rs_alloc_sta(void *priv, gfp_t gfp) -- 2.7.4