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s390/dasd: fix refcount for PAV reassignment 

commit 9d862ababb609439c5d6987f6d3ddd09e703aa0b upstream.

Add refcount to the DASD device when a summary unit check worker is
scheduled. This prevents that the device is set offline with worker
in place.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stefan Haberland 2015-12-15 10:45:05 +01:00 committed by Greg Kroah-Hartman
parent 9155d3f258
commit 509a4bccfe
1 changed files with 16 additions and 5 deletions
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21
drivers/s390/block/dasd_alias.c
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@ -264,8 +264,10 @@ void dasd_alias_disconnect_device_from_lcu(struct dasd_device *device)
spin_unlock_irqrestore(&lcu->lock, flags);
cancel_work_sync(&lcu->suc_data.worker);
spin_lock_irqsave(&lcu->lock, flags);
if (device == lcu->suc_data.device)
if (device == lcu->suc_data.device) {
dasd_put_device(device);
lcu->suc_data.device = NULL;
}
}
was_pending = 0;
if (device == lcu->ruac_data.device) {
@ -273,8 +275,10 @@ void dasd_alias_disconnect_device_from_lcu(struct dasd_device *device)
was_pending = 1;
cancel_delayed_work_sync(&lcu->ruac_data.dwork);
spin_lock_irqsave(&lcu->lock, flags);
if (device == lcu->ruac_data.device)
if (device == lcu->ruac_data.device) {
dasd_put_device(device);
lcu->ruac_data.device = NULL;
}
}
private->lcu = NULL;
spin_unlock_irqrestore(&lcu->lock, flags);
@ -549,8 +553,10 @@ static void lcu_update_work(struct work_struct *work)
if ((rc && (rc != -EOPNOTSUPP)) || (lcu->flags & NEED_UAC_UPDATE)) {
DBF_DEV_EVENT(DBF_WARNING, device, "could not update"
" alias data in lcu (rc = %d), retry later", rc);
schedule_delayed_work(&lcu->ruac_data.dwork, 30*HZ);
if (!schedule_delayed_work(&lcu->ruac_data.dwork, 30*HZ))
dasd_put_device(device);
} else {
dasd_put_device(device);
lcu->ruac_data.device = NULL;
lcu->flags &= ~UPDATE_PENDING;
}
@ -593,8 +599,10 @@ static int _schedule_lcu_update(struct alias_lcu *lcu,
*/
if (!usedev)
return -EINVAL;
dasd_get_device(usedev);
lcu->ruac_data.device = usedev;
schedule_delayed_work(&lcu->ruac_data.dwork, 0);
if (!schedule_delayed_work(&lcu->ruac_data.dwork, 0))
dasd_put_device(usedev);
return 0;
}
@ -926,6 +934,7 @@ static void summary_unit_check_handling_work(struct work_struct *work)
/* 3. read new alias configuration */
_schedule_lcu_update(lcu, device);
lcu->suc_data.device = NULL;
dasd_put_device(device);
spin_unlock_irqrestore(&lcu->lock, flags);
}
@ -985,6 +994,8 @@ void dasd_alias_handle_summary_unit_check(struct dasd_device *device,
}
lcu->suc_data.reason = reason;
lcu->suc_data.device = device;
dasd_get_device(device);
spin_unlock(&lcu->lock);
schedule_work(&lcu->suc_data.worker);
if (!schedule_work(&lcu->suc_data.worker))
dasd_put_device(device);
};