mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
[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:
parent
57467195d1
commit
c2ba444d1d
1 changed files with 33 additions and 12 deletions
|
@ -674,11 +674,8 @@ dasd_term_IO(struct dasd_ccw_req * cqr)
|
||||||
rc = ccw_device_clear(device->cdev, (long) cqr);
|
rc = ccw_device_clear(device->cdev, (long) cqr);
|
||||||
switch (rc) {
|
switch (rc) {
|
||||||
case 0: /* termination successful */
|
case 0: /* termination successful */
|
||||||
if (cqr->retries > 0) {
|
cqr->retries--;
|
||||||
cqr->retries--;
|
cqr->status = DASD_CQR_CLEAR;
|
||||||
cqr->status = DASD_CQR_CLEAR;
|
|
||||||
} else
|
|
||||||
cqr->status = DASD_CQR_FAILED;
|
|
||||||
cqr->stopclk = get_clock();
|
cqr->stopclk = get_clock();
|
||||||
DBF_DEV_EVENT(DBF_DEBUG, device,
|
DBF_DEV_EVENT(DBF_DEBUG, device,
|
||||||
"terminate cqr %p successful",
|
"terminate cqr %p successful",
|
||||||
|
@ -1307,7 +1304,7 @@ dasd_tasklet(struct dasd_device * device)
|
||||||
/* Now call the callback function of requests with final status */
|
/* Now call the callback function of requests with final status */
|
||||||
list_for_each_safe(l, n, &final_queue) {
|
list_for_each_safe(l, n, &final_queue) {
|
||||||
cqr = list_entry(l, struct dasd_ccw_req, list);
|
cqr = list_entry(l, struct dasd_ccw_req, list);
|
||||||
list_del(&cqr->list);
|
list_del_init(&cqr->list);
|
||||||
if (cqr->callback != NULL)
|
if (cqr->callback != NULL)
|
||||||
(cqr->callback)(cqr, cqr->callback_data);
|
(cqr->callback)(cqr, cqr->callback_data);
|
||||||
}
|
}
|
||||||
|
@ -1392,7 +1389,9 @@ _wait_for_wakeup(struct dasd_ccw_req *cqr)
|
||||||
|
|
||||||
device = cqr->device;
|
device = cqr->device;
|
||||||
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
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));
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
||||||
return rc;
|
return rc;
|
||||||
}
|
}
|
||||||
|
@ -1456,15 +1455,37 @@ dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr)
|
||||||
while (!finished) {
|
while (!finished) {
|
||||||
rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr));
|
rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr));
|
||||||
if (rc != -ERESTARTSYS) {
|
if (rc != -ERESTARTSYS) {
|
||||||
/* Request status is either done or failed. */
|
/* Request is final (done or failed) */
|
||||||
rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
|
rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO;
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
spin_lock_irq(get_ccwdev_lock(device->cdev));
|
||||||
if (cqr->status == DASD_CQR_IN_IO &&
|
switch (cqr->status) {
|
||||||
device->discipline->term_IO(cqr) == 0) {
|
case DASD_CQR_IN_IO:
|
||||||
list_del(&cqr->list);
|
/* 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;
|
finished = 1;
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
/* cqr with 'non-interruptable' status - just wait */
|
||||||
|
break;
|
||||||
}
|
}
|
||||||
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
spin_unlock_irq(get_ccwdev_lock(device->cdev));
|
||||||
}
|
}
|
||||||
|
|
Loading…
Reference in a new issue