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[S390] device_schedule_callback() for dcssblk.
Unregistering a device from within a device attribute handler leads to a deadlock. Need to use device_schedule_callback() to unregister device in error path. Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -193,6 +193,12 @@ dcssblk_segment_warn(int rc, char* seg_name)
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}
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}
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static void dcssblk_unregister_callback(struct device *dev)
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{
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device_unregister(dev);
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put_device(dev);
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}
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/*
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* device attribute for switching shared/nonshared (exclusive)
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* operation (show + store)
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@ -276,8 +282,7 @@ removeseg:
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blk_cleanup_queue(dev_info->dcssblk_queue);
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dev_info->gd->queue = NULL;
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put_disk(dev_info->gd);
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device_unregister(dev);
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put_device(dev);
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rc = device_schedule_callback(dev, dcssblk_unregister_callback);
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out:
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up_write(&dcssblk_devices_sem);
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return rc;
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