Curious code in autostart_array

[Pete Zaitcev]

Hi, guys:

My copy of 2.6.17-rc5 has the following code in autostart_array():
                mdp_disk_t *desc = sb->disks + i;
                dev_t dev = MKDEV(desc->major, desc->minor);

                if (!dev)
                        continue;
                if (dev == startdev)
                        continue;
                if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
                        continue;

Under what conditions do you think the last if() statement can fire?
What is its purpose? This looks like an attempt to detect bit clipping.
But what exactly?

Cheers,
-- Pete
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