From c338ba3ca5bef2df2082d9e8d336ff7b2880c326 Mon Sep 17 00:00:00 2001 From: "Abbas, Mohamed" Date: Wed, 21 Jan 2009 10:58:02 -0800 Subject: [PATCH] iwlwifi: fix rs_get_rate WARN_ON() In ieee80211_sta structure there is u64 supp_rates[IEEE80211_NUM_BANDS] this is filled with all support rate from assoc_resp. If we associate with G-band AP only supp_rates of G-band will be set the other band supp_rates will be set to 0. If the user type this command this will cause mac80211 to set to new channel, mac80211 does not disassociate in setting new channel, so the active band is now A-band. then in handling the new essid mac80211 will kick in the assoc steps which involve sending disassociation frame. in this mac80211 will WARN_ON sta->supp_rates[A_BAND] == 0. This fixes: http://www.intellinuxwireless.org/bugzilla/show_bug.cgi?id=1822 http://www.kerneloops.org/searchweek.php?search=rs_get_rate Signed-off-by: mohamed abbas Signed-off-by: Reinette Chatre Signed-off-by: John W. Linville --- drivers/net/wireless/iwlwifi/iwl-3945-rs.c | 14 +++++++++++--- drivers/net/wireless/iwlwifi/iwl-agn-rs.c | 14 ++++++++++++-- 2 files changed, 23 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c index 9b60a0c5de5f..21c841847d88 100644 --- a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c +++ b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c @@ -638,12 +638,16 @@ static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, s8 scale_action = 0; unsigned long flags; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; - u16 fc, rate_mask; + u16 fc; + u16 rate_mask = 0; struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_r; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); IWL_DEBUG_RATE("enter\n"); + if (sta) + rate_mask = sta->supp_rates[sband->band]; + /* Send management frames and broadcast/multicast data using lowest * rate. */ fc = le16_to_cpu(hdr->frame_control); @@ -651,11 +655,15 @@ static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, is_multicast_ether_addr(hdr->addr1) || !sta || !priv_sta) { IWL_DEBUG_RATE("leave: No STA priv data to update!\n"); - info->control.rates[0].idx = rate_lowest_index(sband, sta); + if (!rate_mask) + info->control.rates[0].idx = + rate_lowest_index(sband, NULL); + else + info->control.rates[0].idx = + rate_lowest_index(sband, sta); return; } - rate_mask = sta->supp_rates[sband->band]; index = min(rs_sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT - 1); if (sband->band == IEEE80211_BAND_5GHZ) diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c index f3f17929ca0b..27f50471aed8 100644 --- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c +++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c @@ -944,7 +944,8 @@ static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband, } /* See if there's a better rate or modulation mode to try. */ - rs_rate_scale_perform(priv, hdr, sta, lq_sta); + if (sta && sta->supp_rates[sband->band]) + rs_rate_scale_perform(priv, hdr, sta, lq_sta); out: return; } @@ -2101,14 +2102,23 @@ static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta, struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct iwl_lq_sta *lq_sta = priv_sta; int rate_idx; + u64 mask_bit = 0; IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n"); + if (sta) + mask_bit = sta->supp_rates[sband->band]; + /* Send management frames and broadcast/multicast data using lowest * rate. */ if (!ieee80211_is_data(hdr->frame_control) || is_multicast_ether_addr(hdr->addr1) || !sta || !lq_sta) { - info->control.rates[0].idx = rate_lowest_index(sband, sta); + if (!mask_bit) + info->control.rates[0].idx = + rate_lowest_index(sband, NULL); + else + info->control.rates[0].idx = + rate_lowest_index(sband, sta); return; } -- 2.30.2