scst: Remove scst_device.dev_unregistering again

See also:
- commit 2e386ef7c1 ("Merge branch svn-trunk")
- commit 3fc775c75a / r6589 ("EXTENDED COPY support")
- commit 6c46b1a5a0 ("scst: Remove the dev_unregistering member variable")

scst/include/scst.h

@@ -2801,14 +2801,6 @@ struct scst_device {
 	/* Set, if a strictly serialized cmd is waiting blocked */
 	unsigned int strictly_serialized_cmd_waiting:1;
 
-	/*
-	 * Set, if this device is being unregistered. Useful to let sysfs
-	 * attributes know when they should exit immediately to prevent
-	 * possible deadlocks with their device unregistration waiting for
-	 * their kobj last put.
-	 */
-	unsigned int dev_unregistering:1;
-
 	/*
 	 * Set if ext blocking is pending. It is just shortcut for
 	 * !list_empty(&dev->ext_blockers_list) to save a cache miss.

scst/src/scst_main.c

@@ -1522,7 +1522,6 @@ out:
 	return res;
 
 out_unreg:
-	dev->dev_unregistering = 1;
 	list_del(&dev->dev_list_entry);
 	scst_assign_dev_handler(dev, &scst_null_devtype);
 	goto out_pr_clear_dev;
@@ -1577,8 +1576,6 @@ void scst_unregister_virtual_device(int id)
 		goto out_unlock;
 	}
 
-	dev->dev_unregistering = 1;
-
 	scst_cm_on_dev_unregister(dev);
 
 	list_del_init(&dev->dev_list_entry);