diff options
Diffstat (limited to 'drivers/s390/block/dasd.c')
| -rw-r--r-- | drivers/s390/block/dasd.c | 67 |
1 files changed, 53 insertions, 14 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index ef4c687e7c01..af1d5b404cee 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -7,7 +7,6 @@ * Bugreports.to..: <Linux390@de.ibm.com> * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 * - * $Revision: 1.172 $ */ #include <linux/config.h> @@ -153,7 +152,12 @@ static inline void dasd_state_known_to_new(struct dasd_device * device) { /* Forget the discipline information. */ + if (device->discipline) + module_put(device->discipline->owner); device->discipline = NULL; + if (device->base_discipline) + module_put(device->base_discipline->owner); + device->base_discipline = NULL; device->state = DASD_STATE_NEW; dasd_free_queue(device); @@ -675,11 +679,8 @@ 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", @@ -1308,7 +1309,7 @@ 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); } @@ -1393,7 +1394,9 @@ _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; } @@ -1457,15 +1460,37 @@ 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)); } @@ -1839,9 +1864,10 @@ dasd_generic_remove (struct ccw_device *cdev) */ int dasd_generic_set_online (struct ccw_device *cdev, - struct dasd_discipline *discipline) + struct dasd_discipline *base_discipline) { + struct dasd_discipline *discipline; struct dasd_device *device; int rc; @@ -1849,6 +1875,7 @@ dasd_generic_set_online (struct ccw_device *cdev, if (IS_ERR(device)) return PTR_ERR(device); + discipline = base_discipline; if (device->features & DASD_FEATURE_USEDIAG) { if (!dasd_diag_discipline_pointer) { printk (KERN_WARNING @@ -1860,6 +1887,16 @@ dasd_generic_set_online (struct ccw_device *cdev, } discipline = dasd_diag_discipline_pointer; } + if (!try_module_get(base_discipline->owner)) { + dasd_delete_device(device); + return -EINVAL; + } + if (!try_module_get(discipline->owner)) { + module_put(base_discipline->owner); + dasd_delete_device(device); + return -EINVAL; + } + device->base_discipline = base_discipline; device->discipline = discipline; rc = discipline->check_device(device); @@ -1868,6 +1905,8 @@ dasd_generic_set_online (struct ccw_device *cdev, "dasd_generic couldn't online device %s " "with discipline %s rc=%i\n", cdev->dev.bus_id, discipline->name, rc); + module_put(discipline->owner); + module_put(base_discipline->owner); dasd_delete_device(device); return rc; } |