scsi: aacraid: fixed firmware assert issue

Before issuing IOP reset, INTX mode is selected. This is triggering MSGU
lockup and ended in basecode assert. Use DROP_IO command when IOP reset is
sent in preparation for interrupt mode switch.

Link: https://lore.kernel.org/r/1571120524-6037-4-git-send-email-balsundar.p@microsemi.com
Signed-off-by: Balsundar P <balsundar.p@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/aacraid/aacraid.h

@@ -1673,6 +1673,7 @@ struct aac_dev
 	u8			adapter_shutdown;
 	u32			handle_pci_error;
 	bool			init_reset;
+	u8			soft_reset_support;
 };
 
 #define aac_adapter_interrupt(dev) \

drivers/scsi/aacraid/comminit.c

@@ -571,6 +571,11 @@ struct aac_dev *aac_init_adapter(struct aac_dev *dev)
 		else
 			dev->sa_firmware = 0;
 
+		if (status[4] & le32_to_cpu(AAC_EXTOPT_SOFT_RESET))
+			dev->soft_reset_support = 1;
+		else
+			dev->soft_reset_support = 0;
+
 		if ((dev->comm_interface == AAC_COMM_MESSAGE) &&
 		    (status[2] > dev->base_size)) {
 			aac_adapter_ioremap(dev, 0);

drivers/scsi/aacraid/src.c

@@ -733,10 +733,20 @@ static bool aac_is_ctrl_up_and_running(struct aac_dev *dev)
 	return ctrl_up;
 }
 
+static void aac_src_drop_io(struct aac_dev *dev)
+{
+	if (!dev->soft_reset_support)
+		return;
+
+	aac_adapter_sync_cmd(dev, DROP_IO,
+			0, 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL);
+}
+
 static void aac_notify_fw_of_iop_reset(struct aac_dev *dev)
 {
 	aac_adapter_sync_cmd(dev, IOP_RESET_ALWAYS, 0, 0, 0, 0, 0, 0, NULL,
 						NULL, NULL, NULL, NULL);
+	aac_src_drop_io(dev);
 }
 
 static void aac_send_iop_reset(struct aac_dev *dev)