rt2x00: Replace statically allocated DMA buffers with mapped skb's.

The current PCI drivers require a lot of pre-allocated DMA buffers. Reduce this
by using dynamically mapped skb's (using pci_map_single) instead of the pre-
allocated DMA buffers that are allocated at device start-up time.

At the same time move common RX path code into rt2x00lib from rt2x00pci and
rt2x00usb, as the RX paths now are now almost the same.

Signed-off-by: Gertjan van Wingerde <gwingerde@kpnplanet.nl>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index 2a7f30620356..c9f6d4844139 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -1030,11 +1030,12 @@ static void rt61pci_init_rxentry(struct rt2x00_dev *rt2x00dev,
                                  struct queue_entry *entry)
 {
         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
+        struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
         u32 word;
 
         rt2x00_desc_read(entry_priv->desc, 5, &word);
         rt2x00_set_field32(&word, RXD_W5_BUFFER_PHYSICAL_ADDRESS,
-                           entry_priv->data_dma);
+                           skbdesc->skb_dma);
         rt2x00_desc_write(entry_priv->desc, 5, word);
 
         rt2x00_desc_read(entry_priv->desc, 0, &word);
@@ -1522,7 +1523,6 @@ static void rt61pci_write_tx_desc(struct rt2x00_dev *rt2x00dev,
                                     struct txentry_desc *txdesc)
 {
         struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
-        struct queue_entry_priv_pci *entry_priv = skbdesc->entry->priv_data;
         __le32 *txd = skbdesc->desc;
         u32 word;
 
@@ -1557,7 +1557,7 @@ static void rt61pci_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 
         rt2x00_desc_read(txd, 6, &word);
         rt2x00_set_field32(&word, TXD_W6_BUFFER_PHYSICAL_ADDRESS,
-                           entry_priv->data_dma);
+                           skbdesc->skb_dma);
         rt2x00_desc_write(txd, 6, word);
 
         if (skbdesc->desc_len > TXINFO_SIZE) {
@@ -2302,9 +2302,10 @@ static int rt61pci_probe_hw(struct rt2x00_dev *rt2x00dev)
         rt61pci_probe_hw_mode(rt2x00dev);
 
         /*
-         * This device requires firmware.
+         * This device requires firmware and DMA mapped skbs.
          */
         __set_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags);
+        __set_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags);
 
         /*
          * Set the rssi offset.