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[S390] cio long busy in read configuration data. 

Trying to set a DASD root device online can fail under some circumstances
with the message "Read configuration data returned error -5". The cause
is that read configuration data incorrectly aborts with -EIO when it
encounters a temporary busy condition at a storage server.
Perform retry when encountering temporary busy conditions.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Peter Oberparleiter 2006-06-29 14:56:38 +02:00 committed by Martin Schwidefsky
parent d7d2370255
commit da039bd1e8
1 changed files with 6 additions and 1 deletions
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7
drivers/s390/cio/device_ops.c
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@ -270,7 +270,8 @@ ccw_device_wake_up(struct ccw_device *cdev, unsigned long ip, struct irb *irb)
* We didn't get channel end / device end. Check if path
* verification has been started; we can retry after it has
* finished. We also retry unit checks except for command reject
* or intervention required.
* or intervention required. Also check for long busy
* conditions.
*/
if (cdev->private->flags.doverify ||
cdev->private->state == DEV_STATE_VERIFY)
@ -279,6 +280,10 @@ ccw_device_wake_up(struct ccw_device *cdev, unsigned long ip, struct irb *irb)
!(irb->ecw[0] &
(SNS0_CMD_REJECT | SNS0_INTERVENTION_REQ)))
cdev->private->intparm = -EAGAIN;
else if ((irb->scsw.dstat & DEV_STAT_ATTENTION) &&
(irb->scsw.dstat & DEV_STAT_DEV_END) &&
(irb->scsw.dstat & DEV_STAT_UNIT_EXCEP))
cdev->private->intparm = -EAGAIN;
else
cdev->private->intparm = -EIO;