Merge git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6:
  iwlwifi: fix device id registration for 6000 series 2x2 devices
  ath5k: update channel in sw state after stopping RX and TX
  rtl8187: use DMA-aware buffers with usb_control_msg
  mac80211: avoid NULL ptr deref when finding max_rates in PID and minstrel
  airo: airo_get_encode{,ext} potential buffer overflow

Pulled directly by Linus because Davem is off playing shuffle-board at
some Alaskan cruise, and the NULL ptr deref issue hits people and should
get merged sooner rather than later.

David - make us proud on the shuffle-board tournament!

7 files changed, 89 insertions, 31 deletions

diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index c36d3a3d655f..d73475739127 100644
--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -6501,7 +6501,10 @@ static int airo_get_encode(struct net_device *dev,
 
         /* Copy the key to the user buffer */
         dwrq->length = get_wep_key(local, index, &buf[0], sizeof(buf));
-        memcpy(extra, buf, dwrq->length);
+        if (dwrq->length != -1)
+                memcpy(extra, buf, dwrq->length);
+        else
+                dwrq->length = 0;
 
         return 0;
 }
@@ -6659,7 +6662,10 @@ static int airo_get_encodeext(struct net_device *dev,
         
         /* Copy the key to the user buffer */
         ext->key_len = get_wep_key(local, idx, &buf[0], sizeof(buf));
-        memcpy(extra, buf, ext->key_len);
+        if (ext->key_len != -1)
+                memcpy(extra, buf, ext->key_len);
+        else
+                ext->key_len = 0;
 
         return 0;
 }
diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
index a08bc8a4fb69..32df27a9c7a2 100644
--- a/drivers/net/wireless/ath5k/base.c
+++ b/drivers/net/wireless/ath5k/base.c
@@ -214,7 +214,7 @@ static struct pci_driver ath5k_pci_driver = {
  * Prototypes - MAC 802.11 stack related functions
  */
 static int ath5k_tx(struct ieee80211_hw *hw, struct sk_buff *skb);
-static int ath5k_reset(struct ath5k_softc *sc, bool stop, bool change_channel);
+static int ath5k_reset(struct ath5k_softc *sc, struct ieee80211_channel *chan);
 static int ath5k_reset_wake(struct ath5k_softc *sc);
 static int ath5k_start(struct ieee80211_hw *hw);
 static void ath5k_stop(struct ieee80211_hw *hw);
@@ -1038,16 +1038,13 @@ ath5k_chan_set(struct ath5k_softc *sc, struct ieee80211_channel *chan)
         if (chan->center_freq != sc->curchan->center_freq ||
                 chan->hw_value != sc->curchan->hw_value) {
 
-                sc->curchan = chan;
-                sc->curband = &sc->sbands[chan->band];
-
                 /*
                  * To switch channels clear any pending DMA operations;
                  * wait long enough for the RX fifo to drain, reset the
                  * hardware at the new frequency, and then re-enable
                  * the relevant bits of the h/w.
                  */
-                return ath5k_reset(sc, true, true);
+                return ath5k_reset(sc, chan);
         }
 
         return 0;
@@ -2314,7 +2311,7 @@ ath5k_init(struct ath5k_softc *sc)
         sc->imask = AR5K_INT_RXOK | AR5K_INT_RXERR | AR5K_INT_RXEOL |
                 AR5K_INT_RXORN | AR5K_INT_TXDESC | AR5K_INT_TXEOL |
                 AR5K_INT_FATAL | AR5K_INT_GLOBAL;
-        ret = ath5k_reset(sc, false, false);
+        ret = ath5k_reset(sc, NULL);
         if (ret)
                 goto done;
 
@@ -2599,18 +2596,25 @@ drop_packet:
         return NETDEV_TX_OK;
 }
 
+/*
+ * Reset the hardware.  If chan is not NULL, then also pause rx/tx
+ * and change to the given channel.
+ */
 static int
-ath5k_reset(struct ath5k_softc *sc, bool stop, bool change_channel)
+ath5k_reset(struct ath5k_softc *sc, struct ieee80211_channel *chan)
 {
         struct ath5k_hw *ah = sc->ah;
         int ret;
 
         ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "resetting\n");
 
-        if (stop) {
+        if (chan) {
                 ath5k_hw_set_imr(ah, 0);
                 ath5k_txq_cleanup(sc);
                 ath5k_rx_stop(sc);
+
+                sc->curchan = chan;
+                sc->curband = &sc->sbands[chan->band];
         }
         ret = ath5k_hw_reset(ah, sc->opmode, sc->curchan, true);
         if (ret) {
@@ -2648,7 +2652,7 @@ ath5k_reset_wake(struct ath5k_softc *sc)
 {
         int ret;
 
-        ret = ath5k_reset(sc, true, true);
+        ret = ath5k_reset(sc, sc->curchan);
         if (!ret)
                 ieee80211_wake_queues(sc->hw);
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-6000.c b/drivers/net/wireless/iwlwifi/iwl-6000.c
index edfa5e149f71..bd438d8acf55 100644
--- a/drivers/net/wireless/iwlwifi/iwl-6000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-6000.c
@@ -101,8 +101,8 @@ struct iwl_cfg iwl6000_2agn_cfg = {
         .eeprom_ver = EEPROM_5000_EEPROM_VERSION,
         .eeprom_calib_ver = EEPROM_5000_TX_POWER_VERSION,
         .mod_params = &iwl50_mod_params,
-        .valid_tx_ant = ANT_BC,
-        .valid_rx_ant = ANT_BC,
+        .valid_tx_ant = ANT_AB,
+        .valid_rx_ant = ANT_AB,
         .need_pll_cfg = false,
 };
 
@@ -117,8 +117,8 @@ struct iwl_cfg iwl6050_2agn_cfg = {
         .eeprom_ver = EEPROM_5000_EEPROM_VERSION,
         .eeprom_calib_ver = EEPROM_5000_TX_POWER_VERSION,
         .mod_params = &iwl50_mod_params,
-        .valid_tx_ant = ANT_BC,
-        .valid_rx_ant = ANT_BC,
+        .valid_tx_ant = ANT_AB,
+        .valid_rx_ant = ANT_AB,
         .need_pll_cfg = false,
 };
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 1ef4192207a5..3bb28db4a40f 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -3636,7 +3636,9 @@ static struct pci_device_id iwl_hw_card_ids[] = {
         {IWL_PCI_DEVICE(0x0085, 0x1112, iwl6000_2ag_cfg)},
         {IWL_PCI_DEVICE(0x0082, 0x1122, iwl6000_2ag_cfg)},
         {IWL_PCI_DEVICE(0x422B, PCI_ANY_ID, iwl6000_3agn_cfg)},
+        {IWL_PCI_DEVICE(0x422C, PCI_ANY_ID, iwl6000_2agn_cfg)},
         {IWL_PCI_DEVICE(0x4238, PCI_ANY_ID, iwl6000_3agn_cfg)},
+        {IWL_PCI_DEVICE(0x4239, PCI_ANY_ID, iwl6000_2agn_cfg)},
         {IWL_PCI_DEVICE(0x0082, PCI_ANY_ID, iwl6000_2agn_cfg)},
         {IWL_PCI_DEVICE(0x0085, PCI_ANY_ID, iwl6000_3agn_cfg)},
         {IWL_PCI_DEVICE(0x0086, PCI_ANY_ID, iwl6050_3agn_cfg)},
diff --git a/drivers/net/wireless/rtl818x/rtl8187.h b/drivers/net/wireless/rtl818x/rtl8187.h
index 9718f61809cf..edeff82a4d06 100644
--- a/drivers/net/wireless/rtl818x/rtl8187.h
+++ b/drivers/net/wireless/rtl818x/rtl8187.h
@@ -120,6 +120,12 @@ struct rtl8187_priv {
                 __le64 buf;
                 struct sk_buff_head queue;
         } b_tx_status; /* This queue is used by both -b and non-b devices */
+        struct mutex io_mutex;
+        union {
+                u8 bits8;
+                __le16 bits16;
+                __le32 bits32;
+        } *io_dmabuf;
 };
 
 void rtl8187_write_phy(struct ieee80211_hw *dev, u8 addr, u32 data);
@@ -129,10 +135,14 @@ static inline u8 rtl818x_ioread8_idx(struct rtl8187_priv *priv,
 {
         u8 val;
 
+        mutex_lock(&priv->io_mutex);
         usb_control_msg(priv->udev, usb_rcvctrlpipe(priv->udev, 0),
                         RTL8187_REQ_GET_REG, RTL8187_REQT_READ,
-                        (unsigned long)addr, idx & 0x03, &val,
-                        sizeof(val), HZ / 2);
+                        (unsigned long)addr, idx & 0x03,
+                        &priv->io_dmabuf->bits8, sizeof(val), HZ / 2);
+
+        val = priv->io_dmabuf->bits8;
+        mutex_unlock(&priv->io_mutex);
 
         return val;
 }
@@ -147,10 +157,14 @@ static inline u16 rtl818x_ioread16_idx(struct rtl8187_priv *priv,
 {
         __le16 val;
 
+        mutex_lock(&priv->io_mutex);
         usb_control_msg(priv->udev, usb_rcvctrlpipe(priv->udev, 0),
                         RTL8187_REQ_GET_REG, RTL8187_REQT_READ,
-                        (unsigned long)addr, idx & 0x03, &val,
-                        sizeof(val), HZ / 2);
+                        (unsigned long)addr, idx & 0x03,
+                        &priv->io_dmabuf->bits16, sizeof(val), HZ / 2);
+
+        val = priv->io_dmabuf->bits16;
+        mutex_unlock(&priv->io_mutex);
 
         return le16_to_cpu(val);
 }
@@ -165,10 +179,14 @@ static inline u32 rtl818x_ioread32_idx(struct rtl8187_priv *priv,
 {
         __le32 val;
 
+        mutex_lock(&priv->io_mutex);
         usb_control_msg(priv->udev, usb_rcvctrlpipe(priv->udev, 0),
                         RTL8187_REQ_GET_REG, RTL8187_REQT_READ,
-                        (unsigned long)addr, idx & 0x03, &val,
-                        sizeof(val), HZ / 2);
+                        (unsigned long)addr, idx & 0x03,
+                        &priv->io_dmabuf->bits32, sizeof(val), HZ / 2);
+
+        val = priv->io_dmabuf->bits32;
+        mutex_unlock(&priv->io_mutex);
 
         return le32_to_cpu(val);
 }
@@ -181,10 +199,15 @@ static inline u32 rtl818x_ioread32(struct rtl8187_priv *priv, __le32 *addr)
 static inline void rtl818x_iowrite8_idx(struct rtl8187_priv *priv,
                                         u8 *addr, u8 val, u8 idx)
 {
+        mutex_lock(&priv->io_mutex);
+
+        priv->io_dmabuf->bits8 = val;
         usb_control_msg(priv->udev, usb_sndctrlpipe(priv->udev, 0),
                         RTL8187_REQ_SET_REG, RTL8187_REQT_WRITE,
-                        (unsigned long)addr, idx & 0x03, &val,
-                        sizeof(val), HZ / 2);
+                        (unsigned long)addr, idx & 0x03,
+                        &priv->io_dmabuf->bits8, sizeof(val), HZ / 2);
+
+        mutex_unlock(&priv->io_mutex);
 }
 
 static inline void rtl818x_iowrite8(struct rtl8187_priv *priv, u8 *addr, u8 val)
@@ -195,12 +218,15 @@ static inline void rtl818x_iowrite8(struct rtl8187_priv *priv, u8 *addr, u8 val)
 static inline void rtl818x_iowrite16_idx(struct rtl8187_priv *priv,
                                          __le16 *addr, u16 val, u8 idx)
 {
-        __le16 buf = cpu_to_le16(val);
+        mutex_lock(&priv->io_mutex);
 
+        priv->io_dmabuf->bits16 = cpu_to_le16(val);
         usb_control_msg(priv->udev, usb_sndctrlpipe(priv->udev, 0),
                         RTL8187_REQ_SET_REG, RTL8187_REQT_WRITE,
-                        (unsigned long)addr, idx & 0x03, &buf, sizeof(buf),
-                        HZ / 2);
+                        (unsigned long)addr, idx & 0x03,
+                        &priv->io_dmabuf->bits16, sizeof(val), HZ / 2);
+
+        mutex_unlock(&priv->io_mutex);
 }
 
 static inline void rtl818x_iowrite16(struct rtl8187_priv *priv, __le16 *addr,
@@ -212,12 +238,15 @@ static inline void rtl818x_iowrite16(struct rtl8187_priv *priv, __le16 *addr,
 static inline void rtl818x_iowrite32_idx(struct rtl8187_priv *priv,
                                          __le32 *addr, u32 val, u8 idx)
 {
-        __le32 buf = cpu_to_le32(val);
+        mutex_lock(&priv->io_mutex);
 
+        priv->io_dmabuf->bits32 = cpu_to_le32(val);
         usb_control_msg(priv->udev, usb_sndctrlpipe(priv->udev, 0),
                         RTL8187_REQ_SET_REG, RTL8187_REQT_WRITE,
-                        (unsigned long)addr, idx & 0x03, &buf, sizeof(buf),
-                        HZ / 2);
+                        (unsigned long)addr, idx & 0x03,
+                        &priv->io_dmabuf->bits32, sizeof(val), HZ / 2);
+
+        mutex_unlock(&priv->io_mutex);
 }
 
 static inline void rtl818x_iowrite32(struct rtl8187_priv *priv, __le32 *addr,
diff --git a/drivers/net/wireless/rtl818x/rtl8187_dev.c b/drivers/net/wireless/rtl818x/rtl8187_dev.c
index fd81884b9c7d..bac6cfba6abd 100644
--- a/drivers/net/wireless/rtl818x/rtl8187_dev.c
+++ b/drivers/net/wireless/rtl818x/rtl8187_dev.c
@@ -1329,6 +1329,14 @@ static int __devinit rtl8187_probe(struct usb_interface *intf,
         priv = dev->priv;
         priv->is_rtl8187b = (id->driver_info == DEVICE_RTL8187B);
 
+        /* allocate "DMA aware" buffer for register accesses */
+        priv->io_dmabuf = kmalloc(sizeof(*priv->io_dmabuf), GFP_KERNEL);
+        if (!priv->io_dmabuf) {
+                err = -ENOMEM;
+                goto err_free_dev;
+        }
+        mutex_init(&priv->io_mutex);
+
         SET_IEEE80211_DEV(dev, &intf->dev);
         usb_set_intfdata(intf, dev);
         priv->udev = udev;
@@ -1495,7 +1503,7 @@ static int __devinit rtl8187_probe(struct usb_interface *intf,
         err = ieee80211_register_hw(dev);
         if (err) {
                 printk(KERN_ERR "rtl8187: Cannot register device\n");
-                goto err_free_dev;
+                goto err_free_dmabuf;
         }
         mutex_init(&priv->conf_mutex);
         skb_queue_head_init(&priv->b_tx_status.queue);
@@ -1506,6 +1514,8 @@ static int __devinit rtl8187_probe(struct usb_interface *intf,
 
         return 0;
 
+ err_free_dmabuf:
+        kfree(priv->io_dmabuf);
  err_free_dev:
         ieee80211_free_hw(dev);
         usb_set_intfdata(intf, NULL);
@@ -1526,6 +1536,7 @@ static void __devexit rtl8187_disconnect(struct usb_interface *intf)
         priv = dev->priv;
         usb_reset_device(priv->udev);
         usb_put_dev(interface_to_usbdev(intf));
+        kfree(priv->io_dmabuf);
         ieee80211_free_hw(dev);
 }
 
diff --git a/drivers/net/wireless/rtl818x/rtl8187_rtl8225.c b/drivers/net/wireless/rtl818x/rtl8187_rtl8225.c
index 78df281b297a..a09819386a1e 100644
--- a/drivers/net/wireless/rtl818x/rtl8187_rtl8225.c
+++ b/drivers/net/wireless/rtl818x/rtl8187_rtl8225.c
@@ -88,9 +88,15 @@ static void rtl8225_write_8051(struct ieee80211_hw *dev, u8 addr, __le16 data)
         rtl818x_iowrite16(priv, &priv->map->RFPinsOutput, reg80);
         udelay(10);
 
+        mutex_lock(&priv->io_mutex);
+
+        priv->io_dmabuf->bits16 = data;
         usb_control_msg(priv->udev, usb_sndctrlpipe(priv->udev, 0),
                         RTL8187_REQ_SET_REG, RTL8187_REQT_WRITE,
-                        addr, 0x8225, &data, sizeof(data), HZ / 2);
+                        addr, 0x8225, &priv->io_dmabuf->bits16, sizeof(data),
+                        HZ / 2);
+
+        mutex_unlock(&priv->io_mutex);
 
         rtl818x_iowrite16(priv, &priv->map->RFPinsOutput, reg80 | (1 << 2));
         udelay(10);