libertas: convert libertas driver to use an event/cmdresp queue

This patch (co-developed by Dan Williams and Holger Schurig) uses a kfifo
object for events and a swapping buffer scheme for the command response to
preserve the zero-copy semantics of the CF driver and keep memory usage low.
The main thread should only ever touch the buffer indexed by priv->resp_idx,
while the interface code is free to write to the second buffer, then swap
priv->resp_idx under the driver spinlock.  The firmware specs only permit
one in-flight command, so there will only ever be one command response to
process at a time.

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/drivers/net/wireless/libertas/if_usb.h b/drivers/net/wireless/libertas/if_usb.h
index e4829a391eb9..5771a83a43f0 100644
--- a/drivers/net/wireless/libertas/if_usb.h
+++ b/drivers/net/wireless/libertas/if_usb.h
@@ -46,8 +46,6 @@ struct if_usb_card {
         struct lbs_private *priv;
 
         struct sk_buff *rx_skb;
-        uint32_t usb_event_cause;
-        uint8_t usb_int_cause;
 
         uint8_t ep_in;
         uint8_t ep_out;