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KVM: s390: virtio-ccw: Handle command rejects.

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A command reject for a ccw may happen if we run on a host not supporting
a certain feature. We want to be able to handle this as special case of
command failure, so let's split this off from the generic -EIO error code.

Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Cornelia Huck 2013-06-04 11:04:47 +02:00 committed by Christian Borntraeger
parent d208c79d63
commit 19e4735bd7
1 changed files with 9 additions and 2 deletions
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11
drivers/s390/kvm/virtio_ccw.c
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@ -642,8 +642,15 @@ static void virtio_ccw_int_handler(struct ccw_device *cdev,
(SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
/* OK */
}
if (irb_is_error(irb))
vcdev->err = -EIO; /* XXX - use real error */
if (irb_is_error(irb)) {
/* Command reject? */
if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
(irb->ecw[0] & SNS0_CMD_REJECT))
vcdev->err = -EOPNOTSUPP;
else
/* Map everything else to -EIO. */
vcdev->err = -EIO;
}
if (vcdev->curr_io & activity) {
switch (activity) {
case VIRTIO_CCW_DOING_READ_FEAT: