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authorRalph Wuerthner <rwuerthn@de.ibm.com>2006-10-04 20:02:05 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2006-10-04 20:02:05 +0200
commit4e56296d471a827fdd244cfdb6a1e62fc3af7af0 (patch)
tree8532577922b2dfe337701544305c19726c82443f /drivers/s390
parentf1ee3281bedbbca70a1f53bc715ea6f27c616052 (diff)
[S390] zcrypt device registration/unregistration race.
Fix a race condition during AP device registration and unregistration. Signed-off-by: Ralph Wuerthner <rwuerthn@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/crypto/ap_bus.c23
1 files changed, 12 insertions, 11 deletions
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 6ed0985c0c9..cd30f37fcea 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -449,8 +449,6 @@ static int ap_device_probe(struct device *dev)
ap_dev->drv = ap_drv;
rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
- if (rc)
- ap_dev->unregistered = 1;
return rc;
}
@@ -487,14 +485,7 @@ static int ap_device_remove(struct device *dev)
struct ap_device *ap_dev = to_ap_dev(dev);
struct ap_driver *ap_drv = ap_dev->drv;
- spin_lock_bh(&ap_dev->lock);
- __ap_flush_queue(ap_dev);
- /**
- * set ->unregistered to 1 while holding the lock. This prevents
- * new messages to be put on the queue from now on.
- */
- ap_dev->unregistered = 1;
- spin_unlock_bh(&ap_dev->lock);
+ ap_flush_queue(ap_dev);
if (ap_drv->remove)
ap_drv->remove(ap_dev);
return 0;
@@ -763,6 +754,7 @@ static void ap_scan_bus(void *data)
break;
ap_dev->qid = qid;
ap_dev->queue_depth = queue_depth;
+ ap_dev->unregistered = 1;
spin_lock_init(&ap_dev->lock);
INIT_LIST_HEAD(&ap_dev->pendingq);
INIT_LIST_HEAD(&ap_dev->requestq);
@@ -784,7 +776,12 @@ static void ap_scan_bus(void *data)
/* Add device attributes. */
rc = sysfs_create_group(&ap_dev->device.kobj,
&ap_dev_attr_group);
- if (rc)
+ if (!rc) {
+ spin_lock_bh(&ap_dev->lock);
+ ap_dev->unregistered = 0;
+ spin_unlock_bh(&ap_dev->lock);
+ }
+ else
device_unregister(&ap_dev->device);
}
}
@@ -970,6 +967,8 @@ void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
rc = __ap_queue_message(ap_dev, ap_msg);
if (!rc)
wake_up(&ap_poll_wait);
+ if (rc == -ENODEV)
+ ap_dev->unregistered = 1;
} else {
ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
rc = 0;
@@ -1028,6 +1027,8 @@ static int __ap_poll_all(struct device *dev, void *data)
spin_lock(&ap_dev->lock);
if (!ap_dev->unregistered) {
rc = ap_poll_queue(to_ap_dev(dev), (unsigned long *) data);
+ if (rc)
+ ap_dev->unregistered = 1;
} else
rc = 0;
spin_unlock(&ap_dev->lock);