static int cio_validate_msg_subchannel(struct subchannel *sch)
{
/* Initialization for message subchannels. */
if (!css_sch_is_valid(&sch->schib))
return -ENODEV;
/* Devno is valid. */
return cio_check_devno_blacklisted(sch);
}
static int cio_validate_msg_subchannel(struct subchannel *sch)
{
if (!css_sch_is_valid(&sch->schib))
return -ENODEV;
return cio_check_devno_blacklisted(sch);
}
/**
* cio_validate_subchannel - basic validation of subchannel
* @sch: subchannel structure to be filled out
* @schid: subchannel id
*
* Find out subchannel type and initialize struct subchannel.
* Return codes:
* 0 on success
* -ENXIO for non-defined subchannels
* -ENODEV for invalid subchannels or blacklisted devices
* -EIO for subchannels in an invalid subchannel set
*/
int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid)
{
char dbf_txt[15];
int ccode;
int err;
sprintf(dbf_txt, "valsch%x", schid.sch_no);
CIO_TRACE_EVENT(4, dbf_txt);
/*
* The first subchannel that is not-operational (ccode==3)
* indicates that there aren't any more devices available.
* If stsch gets an exception, it means the current subchannel set
* is not valid.
*/
ccode = stsch(schid, &sch->schib);
if (ccode) {
err = (ccode == 3) ? -ENXIO : ccode;
goto out;
}
sch->st = sch->schib.pmcw.st;
sch->schid = schid;
switch (sch->st) {
case SUBCHANNEL_TYPE_IO:
case SUBCHANNEL_TYPE_MSG:
if (!css_sch_is_valid(&sch->schib))
err = -ENODEV;
else
err = cio_check_devno_blacklisted(sch);
break;
default:
err = 0;
}
if (err)
goto out;
CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
sch->schid.ssid, sch->schid.sch_no, sch->st);
out:
return err;
}
