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s390/zcrypt: fix device unregister race 

The ap_queue_messsage function will call device_unregister if the
unregistered field of the device has been set while trying to queue
a message. This races with other device_unregister calls, e.g. from
the ap_scan_bus. Remove the call to device_unregister from
ap_queue_message and let ap_scan_bus deal with it.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2015-07-17 15:01:08 +02:00
parent 889875a14f
commit 98733791e8
1 changed files with 0 additions and 2 deletions
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2
drivers/s390/crypto/ap_bus.c
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@ -1666,8 +1666,6 @@ void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
rc = -ENODEV;
}
spin_unlock_bh(&ap_dev->lock);
if (rc == -ENODEV)
device_unregister(&ap_dev->device);
}
EXPORT_SYMBOL(ap_queue_message);