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, 4 insertions, 23 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index 29dba86c8cf..552f0e94f80 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -266,9 +266,7 @@ static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 {
         struct queue_entry *entry = (struct queue_entry *)urb->context;
         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
-        struct sk_buff *skb;
-        struct skb_frame_desc *skbdesc;
-        struct rxdone_entry_desc rxdesc;
+        struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
         u8 rxd[32];
 
         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
@@ -284,36 +282,19 @@ static void rt2x00usb_interrupt_rxdone(struct urb *urb)
                 goto skip_entry;
 
         /*
-         * Fill in skb descriptor
+         * Fill in desc fields of the skb descriptor
          */
-        skbdesc = get_skb_frame_desc(entry->skb);
-        memset(skbdesc, 0, sizeof(*skbdesc));
-        skbdesc->entry = entry;
         skbdesc->desc = rxd;
         skbdesc->desc_len = entry->queue->desc_size;
 
-        memset(&rxdesc, 0, sizeof(rxdesc));
-        rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
-
-        /*
-         * Allocate a new sk buffer to replace the current one.
-         * If allocation fails, we should drop the current frame
-         * so we can recycle the existing sk buffer for the new frame.
-         */
-        skb = rt2x00queue_alloc_skb(entry->queue);
-        if (!skb)
-                goto skip_entry;
-
         /*
          * Send the frame to rt2x00lib for further processing.
          */
-        rt2x00lib_rxdone(entry, &rxdesc);
+        rt2x00lib_rxdone(rt2x00dev, entry);
 
         /*
-         * Replace current entry's skb with the newly allocated one,
-         * and reinitialize the urb.
+         * Reinitialize the urb.
          */
-        entry->skb = skb;
         urb->transfer_buffer = entry->skb->data;
         urb->transfer_buffer_length = entry->skb->len;