[SCSI] stex: change wait loop code

The original wait loop may be much longer than intended time.
Use more accurate timer_after for it. Also adjust wait value to
avoid unnecessary long waiting.
Signed-off-by: Ed Lin <ed.lin@promise.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/stex.c

@@ -76,9 +76,10 @@ enum {
 	MU_STATE_STARTED			= 4,
 	MU_STATE_RESETTING			= 5,
 
-	MU_MAX_DELAY_TIME			= 240000,
+	MU_MAX_DELAY				= 120,
 	MU_HANDSHAKE_SIGNATURE			= 0x55aaaa55,
 	MU_HANDSHAKE_SIGNATURE_HALF		= 0x5a5a0000,
+	MU_HARD_RESET_WAIT			= 30000,
 	HMU_PARTNER_TYPE			= 2,
 
 	/* firmware returned values */
@@ -910,23 +911,22 @@ static int stex_handshake(struct st_hba *hba)
 	struct handshake_frame *h;
 	dma_addr_t status_phys;
 	u32 data;
-	int i;
+	unsigned long before;
 
 	if (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
 		writel(MU_INBOUND_DOORBELL_HANDSHAKE, base + IDBL);
 		readl(base + IDBL);
-		for (i = 0; readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE
-			&& i < MU_MAX_DELAY_TIME; i++) {
-			rmb();
-			msleep(1);
-		}
-
-		if (i == MU_MAX_DELAY_TIME) {
+		before = jiffies;
+		while (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
+			if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
 				printk(KERN_ERR DRV_NAME
 					"(%s): no handshake signature\n",
 					pci_name(hba->pdev));
 				return -1;
 			}
+			rmb();
+			msleep(1);
+		}
 	}
 
 	udelay(10);
@@ -965,18 +965,17 @@ static int stex_handshake(struct st_hba *hba)
 	readl(base + IDBL); /* flush */
 
 	udelay(10);
-	for (i = 0; readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE
-		&& i < MU_MAX_DELAY_TIME; i++) {
-		rmb();
-		msleep(1);
-	}
-
-	if (i == MU_MAX_DELAY_TIME) {
+	before = jiffies;
+	while (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
+		if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
 			printk(KERN_ERR DRV_NAME
 				"(%s): no signature after handshake frame\n",
 				pci_name(hba->pdev));
 			return -1;
 		}
+		rmb();
+		msleep(1);
+	}
 
 	writel(0, base + IMR0);
 	readl(base + IMR0);
@@ -1059,7 +1058,7 @@ static void stex_hard_reset(struct st_hba *hba)
 	pci_bctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
 	pci_write_config_byte(bus->self, PCI_BRIDGE_CONTROL, pci_bctl);
 
-	for (i = 0; i < MU_MAX_DELAY_TIME; i++) {
+	for (i = 0; i < MU_HARD_RESET_WAIT; i++) {
 		pci_read_config_word(hba->pdev, PCI_COMMAND, &pci_cmd);
 		if (pci_cmd != 0xffff && (pci_cmd & PCI_COMMAND_MASTER))
 			break;