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[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>
This commit is contained in:
Don Fry 2006-09-13 10:15:43 -07:00 committed by Jeff Garzik
parent 38ed61d6c0
commit 5c99346a33
1 changed files with 1 additions and 6 deletions
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7
drivers/net/pcnet32.c
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@ -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;