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authorPeter Oberparleiter <peter.oberparleiter@de.ibm.com>2006-02-20 18:28:13 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-20 20:00:12 -0800
commitaa88861fc3184a7d830954661dd281de4ae8d2ba (patch)
treeac1ff810dd3b8426c727aba3ea57bb6381978f7d /drivers
parent15c73691780252a5571bfa7902b4dc227ec66c84 (diff)
[PATCH] s390: dasd reference counting
When using the dasd diag discipline, the base discipline module (eckd or fba) can be unloaded, even though the dasd driver requires both discipline modules (base and diag) to work correctly. Implement reference counting for both base and diag discipline modules in order to fix this. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/s390/block/dasd.c21
-rw-r--r--drivers/s390/block/dasd_int.h1
2 files changed, 21 insertions, 1 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 08c88fcd8963..06bb992a4c6c 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -156,7 +156,12 @@ dasd_state_known_to_new(struct dasd_device * device)
/* disable extended error reporting for this device */
dasd_disable_eer(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);
@@ -1880,9 +1885,10 @@ 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;
@@ -1890,6 +1896,7 @@ 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
@@ -1901,6 +1908,16 @@ 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);
@@ -1909,6 +1926,8 @@ 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;
}
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index d1b08fa13fd2..5efac1b97ece 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -321,6 +321,7 @@ struct dasd_device {
/* Device discipline stuff. */
struct dasd_discipline *discipline;
+ struct dasd_discipline *base_discipline;
char *private;
/* Device state and target state. */