Re: [PATCH 2/3] MEMSTICK: add support for legacy memorysticks

[Andrew Morton]

On Mon, 20 Sep 2010 18:16:03 -0700 (PDT) Alex Dubov <oakad@xxxxxxxxx> wrote:

> However, do you have a quick
> advice for a case, were idr_pre_get happens outside spin-locked section,
> as opposed to mutex one?

It sucks, but...

again:
	if (idr_pre_get(..., GFP_KERNEL) == NULL)
		return -ENOMEM;		/* We're really out-of-memory */
	spin_lock(lock);
	if (idr_get_new(...) == -EAGAIN) {
		spin_unlock(lock);
		goto again;		/* Someone stole our preallocation! */
	}
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