[PATCH] pcnet32: remove unnecessary save/restore register accesses.

Delete unnecessary save/restore of rap in interrupt handler and statistics.

tested ia32 and ppc64.

Signed-off-by:  Don Fry <brazilnut@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 1 insertions, 6 deletions

diff --git a/drivers/net/pcnet32.c b/drivers/net/pcnet32.c
index 5e26fe806e..98b7ab2816 100644
--- a/drivers/net/pcnet32.c
+++ b/drivers/net/pcnet32.c
@@ -2262,7 +2262,7 @@ pcnet32_interrupt(int irq, void *dev_id, struct pt_regs *regs)
         struct net_device *dev = dev_id;
         struct pcnet32_private *lp;
         unsigned long ioaddr;
-        u16 csr0, rap;
+        u16 csr0;
         int boguscnt = max_interrupt_work;
         int must_restart;
 
@@ -2278,7 +2278,6 @@ pcnet32_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
         spin_lock(&lp->lock);
 
-        rap = lp->a.read_rap(ioaddr);
         while ((csr0 = lp->a.read_csr(ioaddr, 0)) & 0x8f00 && --boguscnt >= 0) {
                 if (csr0 == 0xffff) {
                         break;  /* PCMCIA remove happened */
@@ -2434,7 +2433,6 @@ pcnet32_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
         /* Set interrupt enable. */
         lp->a.write_csr(ioaddr, 0, 0x0040);
-        lp->a.write_rap(ioaddr, rap);
 
         if (netif_msg_intr(lp))
                 printk(KERN_DEBUG "%s: exiting interrupt, csr0=%#4.4x.\n",
@@ -2647,13 +2645,10 @@ static struct net_device_stats *pcnet32_get_stats(struct net_device *dev)
 {
         struct pcnet32_private *lp = dev->priv;
         unsigned long ioaddr = dev->base_addr;
-        u16 saved_addr;
         unsigned long flags;
 
         spin_lock_irqsave(&lp->lock, flags);
-        saved_addr = lp->a.read_rap(ioaddr);
         lp->stats.rx_missed_errors = lp->a.read_csr(ioaddr, 112);
-        lp->a.write_rap(ioaddr, saved_addr);
         spin_unlock_irqrestore(&lp->lock, flags);
 
         return &lp->stats;