diff options
Diffstat (limited to 'drivers/s390/cio/css.c')
| -rw-r--r-- | drivers/s390/cio/css.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index 2520a44fb93d..4d98a0fddedf 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -237,11 +237,25 @@ get_subchannel_by_schid(struct subchannel_id schid) return dev ? to_subchannel(dev) : NULL; } +/** + * css_sch_is_valid() - check if a subchannel is valid + * @schib: subchannel information block for the subchannel + */ +int css_sch_is_valid(struct schib *schib) +{ + if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) + return 0; + return 1; +} +EXPORT_SYMBOL_GPL(css_sch_is_valid); + static int css_get_subchannel_status(struct subchannel *sch) { struct schib schib; - if (stsch(sch->schid, &schib) || !schib.pmcw.dnv) + if (stsch(sch->schid, &schib)) + return CIO_GONE; + if (!css_sch_is_valid(&schib)) return CIO_GONE; if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev)) return CIO_REVALIDATE; @@ -349,7 +363,7 @@ static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) /* Will be done on the slow path. */ return -EAGAIN; } - if (stsch_err(schid, &schib) || !schib.pmcw.dnv) { + if (stsch_err(schid, &schib) || !css_sch_is_valid(&schib)) { /* Unusable - ignore. */ return 0; } |