scsi: aacraid: Rework SOFT reset code

Now the driver issues a soft reset and waits for the controller to be up
and running by periodically checking on the status of the controller
health registers. Also prevents ARC adapters from issuing soft reset if
IOP resets failed.
Signed-off-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Reviewed-by: David Carroll <david.carroll@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/aacraid/src.c

@@ -754,8 +754,8 @@ static void aac_send_hardware_soft_reset(struct aac_dev *dev)
 
 static int aac_src_restart_adapter(struct aac_dev *dev, int bled, u8 reset_type)
 {
-	unsigned long status, start;
 	bool is_ctrl_up;
+	int ret = 0;
 
 	if (bled < 0)
 		goto invalid_out;
@@ -785,24 +785,21 @@ static int aac_src_restart_adapter(struct aac_dev *dev, int bled, u8 reset_type)
 		else
 			goto set_startup;
 
-		/*
-		 * Check to see if KERNEL_UP_AND_RUNNING
-		 * Wait for the adapter to be up and running.
-		 * If !KERNEL_UP_AND_RUNNING issue HW Soft Reset
-		 */
-		status = src_readl(dev, MUnit.OMR);
-		if (dev->sa_firmware
-		 && !(status & KERNEL_UP_AND_RUNNING)) {
-			start = jiffies;
-			do {
-				status = src_readl(dev, MUnit.OMR);
-				if (time_after(jiffies,
-				 start+HZ*SOFT_RESET_TIME)) {
-					aac_send_hardware_soft_reset(dev);
-					start = jiffies;
+		if (!dev->sa_firmware) {
+			ret = -ENODEV;
+			goto out;
 		}
-			} while (!(status & KERNEL_UP_AND_RUNNING));
+
+		aac_send_hardware_soft_reset(dev);
+		dev->msi_enabled = 0;
+
+		is_ctrl_up = aac_is_ctrl_up_and_running(dev);
+		if (!is_ctrl_up) {
+			dev_err(&dev->pdev->dev, "SOFT reset failed\n");
+			ret = -ENODEV;
+			goto out;
 		}
+
 		break;
 	case HW_SOFT_RESET:
 		if (dev->sa_firmware) {
@@ -818,13 +815,14 @@ static int aac_src_restart_adapter(struct aac_dev *dev, int bled, u8 reset_type)
 invalid_out:
 
 	if (src_readl(dev, MUnit.OMR) & KERNEL_PANIC)
-		return -ENODEV;
+		ret = -ENODEV;
 
 set_startup:
 	if (startup_timeout < 300)
 		startup_timeout = 300;
 
-	return 0;
+out:
+	return ret;
 }
 
 /**