iwlwifi: don't use stack memory for kmem cache name

Since the kmem cache API doesn't internally allocate
the name but just points to the name that was passed
in we can't use stack memory for it. Move the name
into the transport struct.
Reported-by: Stanislaw Gruszka <sgruszka@redhat.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/iwlwifi/iwl-trans.h

@@ -458,6 +458,7 @@ struct iwl_trans {
 	/* The following fields are internal only */
 	struct kmem_cache *dev_cmd_pool;
 	size_t dev_cmd_headroom;
+	char dev_cmd_pool_name[50];
 
 	/* pointer to trans specific struct */
 	/*Ensure that this pointer will always be aligned to sizeof pointer */

drivers/net/wireless/iwlwifi/pcie/trans.c

@@ -2080,7 +2080,6 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
 {
 	struct iwl_trans_pcie *trans_pcie;
 	struct iwl_trans *trans;
-	char cmd_pool_name[100];
 	u16 pci_cmd;
 	int err;
 
@@ -2178,12 +2177,12 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
 	init_waitqueue_head(&trans->wait_command_queue);
 	spin_lock_init(&trans->reg_lock);
 
-	snprintf(cmd_pool_name, sizeof(cmd_pool_name), "iwl_cmd_pool:%s",
-		 dev_name(trans->dev));
+	snprintf(trans->dev_cmd_pool_name, sizeof(trans->dev_cmd_pool_name),
+		 "iwl_cmd_pool:%s", dev_name(trans->dev));
 
 	trans->dev_cmd_headroom = 0;
 	trans->dev_cmd_pool =
-		kmem_cache_create(cmd_pool_name,
+		kmem_cache_create(trans->dev_cmd_pool_name,
 				  sizeof(struct iwl_device_cmd)
 				  + trans->dev_cmd_headroom,
 				  sizeof(void *),