diff options
| author |   Cornelia Huck <cornelia.huck@de.ibm.com> | 2007-12-04 16:09:01 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-12-04 16:09:57 +0100 |
| commit | c94dec99f9759c41cadf0f2781846da5b40a98f6 (patch) | |
| tree | 01f0a223aaa7788bc0b5408cb025b21705e04793 /drivers | |
| parent | Linux 2.6.24-rc4 (diff) | |
| download | linux-dev-c94dec99f9759c41cadf0f2781846da5b40a98f6.tar.xz linux-dev-c94dec99f9759c41cadf0f2781846da5b40a98f6.zip | |
[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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/cio/device_id.c | 37 |
1 files changed, 28 insertions, 9 deletions
diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c index 2f6bf462425e..156f3f9786b5 100644 --- a/drivers/s390/cio/device_id.c +++ b/drivers/s390/cio/device_id.c @@ -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) { |