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s390/css: stop stsch loop after cc 3 

Receiving cc=3 from store subchannel means 2 things:
* the subchannel is not provided
* there are no further subchannels in this subchannel set

With this patch we abort the store subchannel loop after cc=3 (or an
exception) and clear the subsequent bits in the subchannel id set.

Reported-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Acked-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2012-10-15 12:24:56 +02:00 committed by Martin Schwidefsky
parent aa92b33c6b
commit cec8546638
3 changed files with 16 additions and 2 deletions
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7
drivers/s390/cio/css.c
View File

@ -377,7 +377,11 @@ 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) || !css_sch_is_valid(&schib)) {
if (stsch_err(schid, &schib)) {
/* Subchannel is not provided. */
return -ENXIO;
}
if (!css_sch_is_valid(&schib)) {
/* Unusable - ignore. */
return 0;
}
@ -536,6 +540,7 @@ static int slow_eval_unknown_fn(struct subchannel_id schid, void *data)
case -ENOMEM:
case -EIO:
/* These should abort looping */
idset_sch_del_subseq(slow_subchannel_set, schid);
break;
default:
rc = 0;

8
drivers/s390/cio/idset.c
View File

@ -90,6 +90,14 @@ void idset_sch_del(struct idset *set, struct subchannel_id schid)
idset_del(set, schid.ssid, schid.sch_no);
}
/* Clear ids starting from @schid up to end of subchannel set. */
void idset_sch_del_subseq(struct idset *set, struct subchannel_id schid)
{
int pos = schid.ssid * set->num_id + schid.sch_no;
bitmap_clear(set->bitmap, pos, set->num_id - schid.sch_no);
}
int idset_sch_contains(struct idset *set, struct subchannel_id schid)
{
return idset_contains(set, schid.ssid, schid.sch_no);

3
drivers/s390/cio/idset.h
View File

@ -1,5 +1,5 @@
/*
* Copyright IBM Corp. 2007
* Copyright IBM Corp. 2007, 2012
* Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
*/
@ -17,6 +17,7 @@ void idset_fill(struct idset *set);
struct idset *idset_sch_new(void);
void idset_sch_add(struct idset *set, struct subchannel_id id);
void idset_sch_del(struct idset *set, struct subchannel_id id);
void idset_sch_del_subseq(struct idset *set, struct subchannel_id schid);
int idset_sch_contains(struct idset *set, struct subchannel_id id);
int idset_sch_get_first(struct idset *set, struct subchannel_id *id);
int idset_is_empty(struct idset *set);