1 files changed, 64 insertions, 43 deletions

diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c
index 918b8b89cf9a..dc4d87f77f6c 100644
--- a/drivers/s390/cio/device_id.c
+++ b/drivers/s390/cio/device_id.c
@@ -26,17 +26,18 @@
 #include "ioasm.h"
 #include "io_sch.h"
 
-/*
- * Input :
- *   devno - device number
- *   ps	   - pointer to sense ID data area
- * Output : none
+/**
+ * vm_vdev_to_cu_type - Convert vm virtual device into control unit type
+ *			for certain devices.
+ * @class: virtual device class
+ * @type: virtual device type
+ *
+ * Returns control unit type if a match was made or %0xffff otherwise.
  */
-static void
-VM_virtual_device_info (__u16 devno, struct senseid *ps)
+static int vm_vdev_to_cu_type(int class, int type)
 {
 	static struct {
-		int vrdcvcla, vrdcvtyp, cu_type;
+		int class, type, cu_type;
 	} vm_devices[] = {
 		{ 0x08, 0x01, 0x3480 },
 		{ 0x08, 0x02, 0x3430 },
@@ -68,8 +69,26 @@ VM_virtual_device_info (__u16 devno, struct senseid *ps)
 		{ 0x40, 0xc0, 0x5080 },
 		{ 0x80, 0x00, 0x3215 },
 	};
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(vm_devices); i++)
+		if (class == vm_devices[i].class && type == vm_devices[i].type)
+			return vm_devices[i].cu_type;
+
+	return 0xffff;
+}
+
+/**
+ * diag_get_dev_info - retrieve device information via DIAG X'210'
+ * @devno: device number
+ * @ps: pointer to sense ID data area
+ *
+ * Returns zero on success, non-zero otherwise.
+ */
+static int diag_get_dev_info(u16 devno, struct senseid *ps)
+{
 	struct diag210 diag_data;
-	int ccode, i;
+	int ccode;
 
 	CIO_TRACE_EVENT (4, "VMvdinf");
 
@@ -79,21 +98,21 @@ VM_virtual_device_info (__u16 devno, struct senseid *ps)
 	};
 
 	ccode = diag210 (&diag_data);
-	ps->reserved = 0xff;
+	if ((ccode == 0) || (ccode == 2)) {
+		ps->reserved = 0xff;
 
-	/* Special case for bloody osa devices. */
-	if (diag_data.vrdcvcla == 0x02 &&
-	    diag_data.vrdcvtyp == 0x20) {
-		ps->cu_type = 0x3088;
-		ps->cu_model = 0x60;
-		return;
-	}
-	for (i = 0; i < ARRAY_SIZE(vm_devices); i++)
-		if (diag_data.vrdcvcla == vm_devices[i].vrdcvcla &&
-		    diag_data.vrdcvtyp == vm_devices[i].vrdcvtyp) {
-			ps->cu_type = vm_devices[i].cu_type;
-			return;
+		/* Special case for osa devices. */
+		if (diag_data.vrdcvcla == 0x02 && diag_data.vrdcvtyp == 0x20) {
+			ps->cu_type = 0x3088;
+			ps->cu_model = 0x60;
+			return 0;
 		}
+		ps->cu_type = vm_vdev_to_cu_type(diag_data.vrdcvcla,
+						diag_data.vrdcvtyp);
+		if (ps->cu_type != 0xffff)
+			return 0;
+	}
+
 	CIO_MSG_EVENT(0, "DIAG X'210' for device %04X returned (cc = %d):"
 		      "vdev class : %02X, vdev type : %04X \n ...  "
 		      "rdev class : %02X, rdev type : %04X, "
@@ -102,6 +121,8 @@ VM_virtual_device_info (__u16 devno, struct senseid *ps)
 		      diag_data.vrdcvcla, diag_data.vrdcvtyp,
 		      diag_data.vrdcrccl, diag_data.vrdccrty,
 		      diag_data.vrdccrmd);
+
+	return -ENODEV;
 }
 
 /*
@@ -130,6 +151,7 @@ __ccw_device_sense_id_start(struct ccw_device *cdev)
 	/* Try on every path. */
 	ret = -ENODEV;
 	while (cdev->private->imask != 0) {
+		cdev->private->senseid.cu_type = 0xFFFF;
 		if ((sch->opm & cdev->private->imask) != 0 &&
 		    cdev->private->iretry > 0) {
 			cdev->private->iretry--;
@@ -153,7 +175,6 @@ ccw_device_sense_id_start(struct ccw_device *cdev)
 	int ret;
 
 	memset (&cdev->private->senseid, 0, sizeof (struct senseid));
-	cdev->private->senseid.cu_type = 0xFFFF;
 	cdev->private->imask = 0x80;
 	cdev->private->iretry = 5;
 	ret = __ccw_device_sense_id_start(cdev);
@@ -173,13 +194,7 @@ ccw_device_check_sense_id(struct ccw_device *cdev)
 
 	sch = to_subchannel(cdev->dev.parent);
 	irb = &cdev->private->irb;
-	/* Did we get a proper answer ? */
-	if (cdev->private->senseid.cu_type != 0xFFFF && 
-	    cdev->private->senseid.reserved == 0xFF) {
-		if (irb->scsw.count < sizeof (struct senseid) - 8)
-			cdev->private->flags.esid = 1;
-		return 0; /* Success */
-	}
+
 	/* Check the error cases. */
 	if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
 		/* Retry Sense ID if requested. */
@@ -231,6 +246,15 @@ ccw_device_check_sense_id(struct ccw_device *cdev)
 				      sch->schid.ssid, sch->schid.sch_no);
 		return -EACCES;
 	}
+
+	/* Did we get a proper answer ? */
+	if (irb->scsw.cc == 0 && cdev->private->senseid.cu_type != 0xFFFF &&
+	    cdev->private->senseid.reserved == 0xFF) {
+		if (irb->scsw.count < sizeof(struct senseid) - 8)
+			cdev->private->flags.esid = 1;
+		return 0; /* Success */
+	}
+
 	/* Hmm, whatever happened, try again. */
 	CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on "
 		      "subchannel 0.%x.%04x returns status %02X%02X\n",
@@ -283,20 +307,17 @@ ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event)
 			break;
 		/* fall through. */
 	default:		/* Sense ID failed. Try asking VM. */
-		if (MACHINE_IS_VM) {
-			VM_virtual_device_info (cdev->private->dev_id.devno,
+		if (MACHINE_IS_VM)
+			ret = diag_get_dev_info(cdev->private->dev_id.devno,
 						&cdev->private->senseid);
-			if (cdev->private->senseid.cu_type != 0xFFFF) {
-				/* Got the device information from VM. */
-				ccw_device_sense_id_done(cdev, 0);
-				return;
-			}
-		}
-		/*
-		 * If we can't couldn't identify the device type we
-		 *  consider the device "not operational".
-		 */
-		ccw_device_sense_id_done(cdev, -ENODEV);
+		else
+			/*
+			 * If we can't couldn't identify the device type we
+			 *  consider the device "not operational".
+			 */
+			ret = -ENODEV;
+
+		ccw_device_sense_id_done(cdev, ret);
 		break;
 	}
 }