[S390] cio chpid offline.

After setting a path to a dasd offline at the SE, I/O hangs on that
dasd for 5 minutes, then continues.
I/O for which an interrupt will not be reported after the channel
path has been disabled was not terminated by the common I/O layer,
causing the dasd MIH to hit after 5 minutes.

Be more aggressive in terminating I/O after setting a channel path
offline. Also make sure to generate a fake irb if the device
driver issues an I/O request after being notified of the killed
I/O and clear residual information from the irb before trying to
start the delayed verification.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index 49ec562d7f60..5ec8ef1df9fa 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -861,6 +861,8 @@ ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
         irb = (struct irb *) __LC_IRB;
         /* Accumulate status. We don't do basic sense. */
         ccw_device_accumulate_irb(cdev, irb);
+        /* Remember to clear irb to avoid residuals. */
+        memset(&cdev->private->irb, 0, sizeof(struct irb));
         /* Try to start delayed device verification. */
         ccw_device_online_verify(cdev, 0);
         /* Note: Don't call handler for cio initiated clear! */