libata: pata_pdc2027x PLL detection minor cleanup

Minor cleanup to remove the unneeded rmb()s per Jeff's advice. Also removed the
pll_clock < 0 check since pll_clock now guaranteed to be >= 0 after Mikael's patch.
Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/pata_pdc2027x.c

@@ -561,12 +561,10 @@ static long pdc_read_counter(struct ata_host *host)
 retry:
 	bccrl = readl(mmio_base + PDC_BYTE_COUNT) & 0x7fff;
 	bccrh = readl(mmio_base + PDC_BYTE_COUNT + 0x100) & 0x7fff;
-	rmb();
 
 	/* Read the counter values again for verification */
 	bccrlv = readl(mmio_base + PDC_BYTE_COUNT) & 0x7fff;
 	bccrhv = readl(mmio_base + PDC_BYTE_COUNT + 0x100) & 0x7fff;
-	rmb();
 
 	counter = (bccrh << 15) | bccrl;
 
@@ -741,9 +739,6 @@ static int pdc_hardware_init(struct ata_host *host, unsigned int board_idx)
 	 */
 	pll_clock = pdc_detect_pll_input_clock(host);
 
-	if (pll_clock < 0) /* counter overflow? Try again. */
-		pll_clock = pdc_detect_pll_input_clock(host);
-
 	dev_printk(KERN_INFO, host->dev, "PLL input clock %ld kHz\n", pll_clock/1000);
 
 	/* Adjust PLL control register */