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Date: Mon, 20 Sep 2010 18:25:37 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Alex Dubov <oakad@...oo.com>
Cc: Maxim Levitsky <maximlevitsky@...il.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] MEMSTICK: add support for legacy memorysticks
On Mon, 20 Sep 2010 18:16:03 -0700 (PDT) Alex Dubov <oakad@...oo.com> 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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