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[PATCH] s390: dasd wait for clear i/o interrupt 

The sleep_on function clears a running cqr without waiting for the related
interrupt.  This can lead to a panic at the time the interrupt is processed
because the related memory might already be freed.  Wait for clear-interrupt
and de-queue cqr prior to return.

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Horst Hummel 2006-02-01 03:06:37 -08:00 committed by Linus Torvalds
parent 57467195d1
commit c2ba444d1d
1 changed files with 33 additions and 12 deletions
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45
drivers/s390/block/dasd.c
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@ -674,11 +674,8 @@ dasd_term_IO(struct dasd_ccw_req * cqr)
rc = ccw_device_clear(device->cdev, (long) cqr);
switch (rc) {
case 0: /* termination successful */
if (cqr->retries > 0) {
cqr->retries--;
cqr->status = DASD_CQR_CLEAR;
} else
cqr->status = DASD_CQR_FAILED;
cqr->retries--;
cqr->status = DASD_CQR_CLEAR;
cqr->stopclk = get_clock();
DBF_DEV_EVENT(DBF_DEBUG, device,
"terminate cqr %p successful",
@ -1307,7 +1304,7 @@ dasd_tasklet(struct dasd_device * device)
/* Now call the callback function of requests with final status */
list_for_each_safe(l, n, &final_queue) {
cqr = list_entry(l, struct dasd_ccw_req, list);
list_del(&cqr->list);
list_del_init(&cqr->list);
if (cqr->callback != NULL)
(cqr->callback)(cqr, cqr->callback_data);
}
@ -1392,7 +1389,9 @@ _wait_for_wakeup(struct dasd_ccw_req *cqr)
device = cqr->device;
spin_lock_irq(get_ccwdev_lock(device->cdev));
rc = cqr->status == DASD_CQR_DONE || cqr->status == DASD_CQR_FAILED;
rc = ((cqr->status == DASD_CQR_DONE ||
cqr->status == DASD_CQR_FAILED) &&
list_empty(&cqr->list));
spin_unlock_irq(get_ccwdev_lock(device->cdev));
return rc;
}
@ -1456,15 +1455,37 @@ dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr)
while (!finished) {
rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr));
if (rc != -ERESTARTSYS) {
/* Request status is either done or failed. */
rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
/* Request is final (done or failed) */
rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO;
break;
}
spin_lock_irq(get_ccwdev_lock(device->cdev));
if (cqr->status == DASD_CQR_IN_IO &&
device->discipline->term_IO(cqr) == 0) {
list_del(&cqr->list);
switch (cqr->status) {
case DASD_CQR_IN_IO:
/* terminate runnig cqr */
if (device->discipline->term_IO) {
cqr->retries = -1;
device->discipline->term_IO(cqr);
/*nished =
* wait (non-interruptible) for final status
* because signal ist still pending
*/
spin_unlock_irq(get_ccwdev_lock(device->cdev));
wait_event(wait_q, _wait_for_wakeup(cqr));
spin_lock_irq(get_ccwdev_lock(device->cdev));
rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO;
finished = 1;
}
break;
case DASD_CQR_QUEUED:
/* request */
list_del_init(&cqr->list);
rc = -EIO;
finished = 1;
break;
default:
/* cqr with 'non-interruptable' status - just wait */
break;
}
spin_unlock_irq(get_ccwdev_lock(device->cdev));
}