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[S390] dasd: fix fixpoint divide exception in define_extent 

If an IO request is build on an alias device without prefix enabled
we try to calculate with zero data from the alias device. This
triggers a BUG statement with fixpoint divide exception.
This case is very unlikely and can only happen if the pathgroup is
lost with an alias device already in use.
Prevent the alias device from being used in this case.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Haberland 2011-12-27 11:27:28 +01:00 committed by Martin Schwidefsky
parent b206181d63
commit b38f27e842
2 changed files with 11 additions and 1 deletions
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10
drivers/s390/block/dasd_alias.c
View File

@ -705,6 +705,16 @@ struct dasd_device *dasd_alias_get_start_dev(struct dasd_device *base_device)
if (lcu->pav == NO_PAV || if (lcu->pav == NO_PAV ||
lcu->flags & (NEED_UAC_UPDATE | UPDATE_PENDING)) lcu->flags & (NEED_UAC_UPDATE | UPDATE_PENDING))
return NULL; return NULL;
if (unlikely(!(private->features.feature[8] & 0x01))) {
/*
* PAV enabled but prefix not, very unlikely
* seems to be a lost pathgroup
* use base device to do IO
*/
DBF_DEV_EVENT(DBF_ERR, base_device, "%s",
"Prefix not enabled with PAV enabled\n");
return NULL;
}
spin_lock_irqsave(&lcu->lock, flags); spin_lock_irqsave(&lcu->lock, flags);
alias_device = group->next; alias_device = group->next;

2
drivers/s390/block/dasd_eckd.c
View File

@ -2397,7 +2397,7 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
sizeof(struct PFX_eckd_data)); sizeof(struct PFX_eckd_data));
} else { } else {
if (define_extent(ccw++, cqr->data, first_trk, if (define_extent(ccw++, cqr->data, first_trk,
last_trk, cmd, startdev) == -EAGAIN) { last_trk, cmd, basedev) == -EAGAIN) {
/* Clock not in sync and XRC is enabled. /* Clock not in sync and XRC is enabled.
* Try again later. * Try again later.
*/ */