iwlagn: add get_dev to iwl_bus_ops

Bus specific layer must know how to return the struct device* of the device.
Implement that as a callback of iwl_bus_ops and use that callback instead of
using the priv->pdev pointer which is meant to disappear soon.

Since the struct device * is needed in hot path, iwl_bus holds a pointer to it
instead of calling get_dev all the time.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c
index b774517..3efa706 100644
--- a/drivers/net/wireless/iwlwifi/iwl-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-rx.c
@@ -182,7 +182,7 @@
 int iwl_rx_queue_alloc(struct iwl_priv *priv)
 {
 	struct iwl_rx_queue *rxq = &priv->rxq;
-	struct device *dev = &priv->pci_dev->dev;
+	struct device *dev = priv->bus.dev;
 	int i;
 
 	spin_lock_init(&rxq->lock);
@@ -213,7 +213,7 @@
 	return 0;
 
 err_rb:
-	dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
+	dma_free_coherent(dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 			  rxq->bd_dma);
 err_bd:
 	return -ENOMEM;