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[S390] cio: Issue SenseID per path. 

We may receive a unit check for every path when we issue a SenseID.
Unfortunately, the channel subsystem will try on a different path
every time if we use a lpm of 0xff, which will exhaust our retry
counter.

Therefore, revert SenseID to its previous per-path behaviour and
just leave out the suspend multipath reconnect.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Cornelia Huck 2007-12-04 16:09:01 +01:00 committed by Martin Schwidefsky
parent 09b56adc98
commit c94dec99f9
1 changed files with 28 additions and 9 deletions
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37
drivers/s390/cio/device_id.c
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@ -113,6 +113,7 @@ __ccw_device_sense_id_start(struct ccw_device *cdev)
{
struct subchannel *sch;
struct ccw1 *ccw;
int ret;
sch = to_subchannel(cdev->dev.parent);
/* Setup sense channel program. */
@ -124,9 +125,25 @@ __ccw_device_sense_id_start(struct ccw_device *cdev)
/* Reset device status. */
memset(&cdev->private->irb, 0, sizeof(struct irb));
cdev->private->flags.intretry = 0;
return cio_start(sch, ccw, LPM_ANYPATH);
/* Try on every path. */
ret = -ENODEV;
while (cdev->private->imask != 0) {
if ((sch->opm & cdev->private->imask) != 0 &&
cdev->private->iretry > 0) {
cdev->private->iretry--;
/* Reset internal retry indication. */
cdev->private->flags.intretry = 0;
ret = cio_start (sch, cdev->private->iccws,
cdev->private->imask);
/* ret is 0, -EBUSY, -EACCES or -ENODEV */
if (ret != -EACCES)
return ret;
}
cdev->private->imask >>= 1;
cdev->private->iretry = 5;
}
return ret;
}
void
@ -136,7 +153,8 @@ ccw_device_sense_id_start(struct ccw_device *cdev)
memset (&cdev->private->senseid, 0, sizeof (struct senseid));
cdev->private->senseid.cu_type = 0xFFFF;
cdev->private->iretry = 3;
cdev->private->imask = 0x80;
cdev->private->iretry = 5;
ret = __ccw_device_sense_id_start(cdev);
if (ret && ret != -EBUSY)
ccw_device_sense_id_done(cdev, ret);
@ -252,13 +270,14 @@ ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event)
ccw_device_sense_id_done(cdev, ret);
break;
case -EACCES: /* channel is not operational. */
sch->lpm &= ~cdev->private->imask;
cdev->private->imask >>= 1;
cdev->private->iretry = 5;
/* fall through. */
case -EAGAIN: /* try again. */
cdev->private->iretry--;
if (cdev->private->iretry > 0) {
ret = __ccw_device_sense_id_start(cdev);
if (ret == 0 || ret == -EBUSY)
break;
}
ret = __ccw_device_sense_id_start(cdev);
if (ret == 0 || ret == -EBUSY)
break;
/* fall through. */
default: /* Sense ID failed. Try asking VM. */
if (MACHINE_IS_VM) {