add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/virt/kvm/coalesced_mmio.c
..
..
@@ -187,15 +187,17 @@
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 			r = kvm_io_bus_unregister_dev(kvm,
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 				zone->pio ? KVM_PIO_BUS : KVM_MMIO_BUS, &dev->dev);
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+			kvm_iodevice_destructor(&dev->dev);
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+
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 			/*
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 			 * On failure, unregister destroys all devices on the
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 			 * bus _except_ the target device, i.e. coalesced_zones
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-			 * has been modified.  No need to restart the walk as
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-			 * there aren't any zones left.
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+			 * has been modified.  Bail after destroying the target
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+			 * device, there's no need to restart the walk as there
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+			 * aren't any zones left.
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 			 */
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 			if (r)
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 				break;
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-			kvm_iodevice_destructor(&dev->dev);
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 		}
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 	}
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