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SubjectRe: more devfs fun (Piled Higher and Deeper)


On Sat, 27 Oct 2001, Alexander Viro wrote:

> devfs_rmdir() checks that directory is empty. Then it calls
> devfsd_notify_one(), which can block. Then it marks the entry
> unregistered and reports success.
>
> Guess what will happen if devfs_register() will happen at that
> moment...

Ugh... My apologies - race here is a bit different. Namely,
devfs_register() find a directory, starts creating a child,
blocks in kmalloc(), _then_ entire devfs_rmdir() happens and
devfs_register() merrily inserts a new child into dead directory.

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