iwlwifi: make tx_cmd_pool kmem cache global

Otherwise we are not able to run more than one device per driver:

[   24.743045] kmem_cache_create: duplicate cache iwl_dev_cmd
[   24.743051] Pid: 3165, comm: NetworkManager Not tainted 3.3.0-rc2-wl+ #5
[   24.743054] Call Trace:
[   24.743066]  [<ffffffff811717d5>] kmem_cache_create+0x655/0x700
[   24.743101]  [<ffffffffa03b9f8b>] iwl_alive_notify+0x1cb/0x1f0 [iwlwifi]
[   24.743111]  [<ffffffffa03ba442>] iwl_load_ucode_wait_alive+0x1b2/0x220 [iwlwifi]
[   24.743142]  [<ffffffffa03ba893>] iwl_run_init_ucode+0x73/0x100 [iwlwifi]
[   24.743152]  [<ffffffffa03b8fa1>] __iwl_up+0x81/0x220 [iwlwifi]
[   24.743161]  [<ffffffffa03b91c0>] iwlagn_mac_start+0x80/0x190 [iwlwifi]
[   24.743188]  [<ffffffffa03307b3>] ieee80211_do_open+0x293/0x770 [mac80211]

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

5 files changed, 21 insertions, 22 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
index a19db4c0c9fa..97ebfd26212e 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
@@ -367,7 +367,7 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
         if (info->flags & IEEE80211_TX_CTL_AMPDU)
                 is_agg = true;
 
-        dev_cmd = kmem_cache_alloc(priv->tx_cmd_pool, GFP_ATOMIC);
+        dev_cmd = kmem_cache_alloc(iwl_tx_cmd_pool, GFP_ATOMIC);
 
         if (unlikely(!dev_cmd))
                 goto drop_unlock_priv;
@@ -458,7 +458,7 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
 
 drop_unlock_sta:
         if (dev_cmd)
-                kmem_cache_free(priv->tx_cmd_pool, dev_cmd);
+                kmem_cache_free(iwl_tx_cmd_pool, dev_cmd);
         spin_unlock(&priv->sta_lock);
 drop_unlock_priv:
         return -1;
@@ -1078,7 +1078,7 @@ int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb,
 
                         info = IEEE80211_SKB_CB(skb);
                         ctx = info->driver_data[0];
-                        kmem_cache_free(priv->tx_cmd_pool,
+                        kmem_cache_free(iwl_tx_cmd_pool,
                                         (info->driver_data[1]));
 
                         memset(&info->status, 0, sizeof(info->status));
@@ -1229,7 +1229,7 @@ int iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
                         WARN_ON_ONCE(1);
 
                 info = IEEE80211_SKB_CB(skb);
-                kmem_cache_free(priv->tx_cmd_pool, (info->driver_data[1]));
+                kmem_cache_free(iwl_tx_cmd_pool, (info->driver_data[1]));
 
                 if (freed == 1) {
                         /* this is the first skb we deliver in this batch */
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 64bc2859dd1b..7927e3e11097 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -1102,8 +1102,6 @@ static void iwl_uninit_drv(struct iwl_priv *priv)
 {
         iwl_free_geos(priv);
         iwl_free_channel_map(priv);
-        if (priv->tx_cmd_pool)
-                kmem_cache_destroy(priv->tx_cmd_pool);
         kfree(priv->scan_cmd);
         kfree(priv->beacon_cmd);
         kfree(rcu_dereference_raw(priv->noa_data));
@@ -1477,6 +1475,9 @@ const struct iwl_op_mode_ops iwl_dvm_ops = {
  * driver and module entry point
  *
  *****************************************************************************/
+
+struct kmem_cache *iwl_tx_cmd_pool;
+
 static int __init iwl_init(void)
 {
 
@@ -1484,20 +1485,27 @@ static int __init iwl_init(void)
         pr_info(DRV_DESCRIPTION ", " DRV_VERSION "\n");
         pr_info(DRV_COPYRIGHT "\n");
 
+        iwl_tx_cmd_pool = kmem_cache_create("iwl_dev_cmd",
+                                            sizeof(struct iwl_device_cmd),
+                                            sizeof(void *), 0, NULL);
+        if (!iwl_tx_cmd_pool)
+                return -ENOMEM;
+
         ret = iwlagn_rate_control_register();
         if (ret) {
                 pr_err("Unable to register rate control algorithm: %d\n", ret);
-                return ret;
+                goto error_rc_register;
         }
 
         ret = iwl_pci_register_driver();
-
         if (ret)
-                goto error_register;
+                goto error_pci_register;
         return ret;
 
-error_register:
+error_pci_register:
         iwlagn_rate_control_unregister();
+error_rc_register:
+        kmem_cache_destroy(iwl_tx_cmd_pool);
         return ret;
 }
 
@@ -1505,6 +1513,7 @@ static void __exit iwl_exit(void)
 {
         iwl_pci_unregister_driver();
         iwlagn_rate_control_unregister();
+        kmem_cache_destroy(iwl_tx_cmd_pool);
 }
 
 module_exit(iwl_exit);
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index f50bd4263b88..df7b165b290c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -1470,10 +1470,9 @@ void iwl_set_hw_rfkill_state(struct iwl_op_mode *op_mode, bool state)
 
 void iwl_free_skb(struct iwl_op_mode *op_mode, struct sk_buff *skb)
 {
-        struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
         struct ieee80211_tx_info *info;
 
         info = IEEE80211_SKB_CB(skb);
-        kmem_cache_free(priv->tx_cmd_pool, (info->driver_data[1]));
+        kmem_cache_free(iwl_tx_cmd_pool, (info->driver_data[1]));
         dev_kfree_skb_any(skb);
 }
diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index 1b05faea7965..aa4b3b122da4 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -725,7 +725,6 @@ struct iwl_priv {
         struct ieee80211_hw *hw;
         struct ieee80211_channel *ieee_channels;
         struct ieee80211_rate *ieee_rates;
-        struct kmem_cache *tx_cmd_pool;
 
         struct list_head calib_results;
 
@@ -983,6 +982,7 @@ struct iwl_priv {
         bool have_rekey_data;
 }; /*iwl_priv */
 
+extern struct kmem_cache *iwl_tx_cmd_pool;
 extern struct iwl_mod_params iwlagn_mod_params;
 
 static inline struct iwl_rxon_context *
diff --git a/drivers/net/wireless/iwlwifi/iwl-ucode.c b/drivers/net/wireless/iwlwifi/iwl-ucode.c
index 404fd8e7958b..d97cf44b75ba 100644
--- a/drivers/net/wireless/iwlwifi/iwl-ucode.c
+++ b/drivers/net/wireless/iwlwifi/iwl-ucode.c
@@ -318,15 +318,6 @@ static int iwl_alive_notify(struct iwl_priv *priv)
 {
         int ret;
 
-        if (!priv->tx_cmd_pool)
-                priv->tx_cmd_pool =
-                        kmem_cache_create("iwl_dev_cmd",
-                                          sizeof(struct iwl_device_cmd),
-                                          sizeof(void *), 0, NULL);
-
-        if (!priv->tx_cmd_pool)
-                return -ENOMEM;
-
         iwl_trans_fw_alive(trans(priv));
 
         priv->passive_no_rx = false;