[PATCH] iwlwifi: Fix rate setting in probe request for HW sacn

This patch fixes setting of rates in probe request used in
HW scan. The bug was reported by Helmut Schaa <hschaa@suse.de>

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 52 insertions, 32 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index a1d2716556be..83019d1d7ccc 100644
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -1747,21 +1747,22 @@ static void iwl_unset_hw_setting(struct iwl_priv *priv)
  * return : set the bit for each supported rate insert in ie
  */
 static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
-                                    u16 basic_rate, int max_count)
+                                    u16 basic_rate, int *left)
 {
         u16 ret_rates = 0, bit;
         int i;
-        u8 *rates;
-
-        rates = &(ie[1]);
+        u8 *cnt = ie;
+        u8 *rates = ie + 1;
 
         for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
                 if (bit & supported_rate) {
                         ret_rates |= bit;
-                        rates[*ie] = iwl_rates[i].ieee |
-                            ((bit & basic_rate) ? 0x80 : 0x00);
-                        *ie = *ie + 1;
-                        if (*ie >= max_count)
+                        rates[*cnt] = iwl_rates[i].ieee |
+                                ((bit & basic_rate) ? 0x80 : 0x00);
+                        (*cnt)++;
+                        (*left)--;
+                        if ((*left <= 0) ||
+                            (*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
                                 break;
                 }
         }
@@ -1778,7 +1779,7 @@ static u16 iwl_fill_probe_req(struct iwl_priv *priv,
 {
         int len = 0;
         u8 *pos = NULL;
-        u16 ret_rates;
+        u16 active_rates, ret_rates, cck_rates;
 
         /* Make sure there is enough space for the probe request,
          * two mandatory IEs and the data */
@@ -1823,19 +1824,27 @@ static u16 iwl_fill_probe_req(struct iwl_priv *priv,
         left -= 2;
         if (left < 0)
                 return 0;
+
         /* ... fill it in... */
         *pos++ = WLAN_EID_SUPP_RATES;
         *pos = 0;
-        ret_rates = priv->active_rate = priv->rates_mask;
+
+        priv->active_rate = priv->rates_mask;
+        active_rates = priv->active_rate;
         priv->active_rate_basic = priv->rates_mask & IWL_BASIC_RATES_MASK;
 
-        iwl_supported_rate_to_ie(pos, priv->active_rate,
-                                 priv->active_rate_basic, left);
+        cck_rates = IWL_CCK_RATES_MASK & active_rates;
+        ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
+                        priv->active_rate_basic, &left);
+        active_rates &= ~ret_rates;
+
+        ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
+                                 priv->active_rate_basic, &left);
+        active_rates &= ~ret_rates;
+
         len += 2 + *pos;
         pos += (*pos) + 1;
-        ret_rates = ~ret_rates & priv->active_rate;
-
-        if (ret_rates == 0)
+        if (active_rates == 0)
                 goto fill_end;
 
         /* fill in supported extended rate */
@@ -1846,7 +1855,8 @@ static u16 iwl_fill_probe_req(struct iwl_priv *priv,
         /* ... fill it in... */
         *pos++ = WLAN_EID_EXT_SUPP_RATES;
         *pos = 0;
-        iwl_supported_rate_to_ie(pos, ret_rates, priv->active_rate_basic, left);
+        iwl_supported_rate_to_ie(pos, active_rates,
+                                 priv->active_rate_basic, &left);
         if (*pos > 0)
                 len += 2 + *pos;
 
diff --git a/drivers/net/wireless/iwlwifi/iwl4965-base.c b/drivers/net/wireless/iwlwifi/iwl4965-base.c
index acdf5507d3d0..5e1279263b22 100644
--- a/drivers/net/wireless/iwlwifi/iwl4965-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl4965-base.c
@@ -1800,21 +1800,22 @@ static void iwl_unset_hw_setting(struct iwl_priv *priv)
  * return : set the bit for each supported rate insert in ie
  */
 static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
-                                    u16 basic_rate, int max_count)
+                                    u16 basic_rate, int *left)
 {
         u16 ret_rates = 0, bit;
         int i;
-        u8 *rates;
-
-        rates = &(ie[1]);
+        u8 *cnt = ie;
+        u8 *rates = ie + 1;
 
         for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
                 if (bit & supported_rate) {
                         ret_rates |= bit;
-                        rates[*ie] = iwl_rates[i].ieee |
-                            ((bit & basic_rate) ? 0x80 : 0x00);
-                        *ie = *ie + 1;
-                        if (*ie >= max_count)
+                        rates[*cnt] = iwl_rates[i].ieee |
+                                ((bit & basic_rate) ? 0x80 : 0x00);
+                        (*cnt)++;
+                        (*left)--;
+                        if ((*left <= 0) ||
+                            (*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
                                 break;
                 }
         }
@@ -1837,7 +1838,7 @@ static u16 iwl_fill_probe_req(struct iwl_priv *priv,
 {
         int len = 0;
         u8 *pos = NULL;
-        u16 ret_rates;
+        u16 active_rates, ret_rates, cck_rates;
 
         /* Make sure there is enough space for the probe request,
          * two mandatory IEs and the data */
@@ -1882,19 +1883,27 @@ static u16 iwl_fill_probe_req(struct iwl_priv *priv,
         left -= 2;
         if (left < 0)
                 return 0;
+
         /* ... fill it in... */
         *pos++ = WLAN_EID_SUPP_RATES;
         *pos = 0;
-        ret_rates = priv->active_rate = priv->rates_mask;
+
+        priv->active_rate = priv->rates_mask;
+        active_rates = priv->active_rate;
         priv->active_rate_basic = priv->rates_mask & IWL_BASIC_RATES_MASK;
 
-        iwl_supported_rate_to_ie(pos, priv->active_rate,
-                                 priv->active_rate_basic, left);
+        cck_rates = IWL_CCK_RATES_MASK & active_rates;
+        ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
+                        priv->active_rate_basic, &left);
+        active_rates &= ~ret_rates;
+
+        ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
+                                 priv->active_rate_basic, &left);
+        active_rates &= ~ret_rates;
+
         len += 2 + *pos;
         pos += (*pos) + 1;
-        ret_rates = ~ret_rates & priv->active_rate;
-
-        if (ret_rates == 0)
+        if (active_rates == 0)
                 goto fill_end;
 
         /* fill in supported extended rate */
@@ -1905,7 +1914,8 @@ static u16 iwl_fill_probe_req(struct iwl_priv *priv,
         /* ... fill it in... */
         *pos++ = WLAN_EID_EXT_SUPP_RATES;
         *pos = 0;
-        iwl_supported_rate_to_ie(pos, ret_rates, priv->active_rate_basic, left);
+        iwl_supported_rate_to_ie(pos, active_rates,
+                                 priv->active_rate_basic, &left);
         if (*pos > 0)
                 len += 2 + *pos;