[S390] cio: provide fake irb for transport mode IO

If a driver wants to do command mode IO while CIO is doing
online path verification we ignore this request and provide
a fake irb when we are done and the driver can do IO again.

For transport mode IO we have no such mechanism, giving the
driver no other chance then to retry the action until we are
done. This is not very reliable.

Provide a fake irb for transport mode IO as well.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 41c21ad0d5f2..ec7fb6d3b479 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -198,7 +198,7 @@ int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
         if (cdev->private->state == DEV_STATE_VERIFY) {
                 /* Remember to fake irb when finished. */
                 if (!cdev->private->flags.fake_irb) {
-                        cdev->private->flags.fake_irb = 1;
+                        cdev->private->flags.fake_irb = FAKE_CMD_IRB;
                         cdev->private->intparm = intparm;
                         return 0;
                 } else
@@ -605,6 +605,16 @@ int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
         sch = to_subchannel(cdev->dev.parent);
         if (!sch->schib.pmcw.ena)
                 return -EINVAL;
+        if (cdev->private->state == DEV_STATE_VERIFY) {
+                /* Remember to fake irb when finished. */
+                if (!cdev->private->flags.fake_irb) {
+                        cdev->private->flags.fake_irb = FAKE_TM_IRB;
+                        cdev->private->intparm = intparm;
+                        return 0;
+                } else
+                        /* There's already a fake I/O around. */
+                        return -EBUSY;
+        }
         if (cdev->private->state != DEV_STATE_ONLINE)
                 return -EIO;
         /* Adjust requested path mask to exclude unusable paths. */