KVM: s390: virtio-ccw: Handle command rejects. (19e4735b) · Commits · e / devices / android_kernel_oneplus_sm7250

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>

drivers/s390/kvm/virtio_ccw.c

+9 −2

Original line number	Diff line number	Diff line
		@@ -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: