staging: comedi: use refcount in comedi_driver_unregister()
Change `comedi_driver_unregister()` to call `comedi_dev_get_from_minor()` instead of `comedi_dev_from_minor()` when finding devices using the driver. This increments the reference count to prevent the device being removed while it is being checked to see if it is attached to the driver. Call `comedi_dev_put()` to decrement the reference afterwards. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -662,7 +662,7 @@ void comedi_driver_unregister(struct comedi_driver *driver)
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/* check for devices using this driver */
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for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
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struct comedi_device *dev = comedi_dev_from_minor(i);
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struct comedi_device *dev = comedi_dev_get_from_minor(i);
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if (!dev)
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continue;
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@ -676,6 +676,7 @@ void comedi_driver_unregister(struct comedi_driver *driver)
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comedi_device_detach(dev);
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}
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mutex_unlock(&dev->mutex);
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comedi_dev_put(dev);
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}
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}
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EXPORT_SYMBOL_GPL(comedi_driver_unregister);
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