[PATCH] powerpc/cell spidernet

Remove a dummy register read that is not needed.
This reduces CPU usage notably during transmit.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: James K Lewis <jklewis@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index f8d7d0d91a6dca9251bbb2a256408924d4b9005c..6bb8f1f9437c48fa7e3b09b6995d15b3acbf69d3 100644 (file)
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -759,8 +759,6 @@ spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
        unsigned long flags;
        int status;
 
-       spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR);
-
        while (chain->tail != chain->head) {
                spin_lock_irqsave(&chain->lock, flags);
                descr = chain->tail;