Re: [PATCH] ida: make ida_simple_get/put() IRQ safe
From: Tejun Heo
Date: Fri Oct 28 2011 - 19:11:56 EST
On Fri, Oct 28, 2011 at 04:01:15PM -0700, Andrew Morton wrote:
> On Wed, 26 Oct 2011 13:33:11 -0700
> Tejun Heo <tj@xxxxxxxxxx> wrote:
> > It's often convenient to be able to release resource from IRQ context.
> > Make ida_simple_*() use irqsave/restore spin ops so that they are IRQ
> > safe.
> The patch also accidentally makes ida_simple_get() callable from
> interrupt context. That's a somewhat unreliable operation due to
> -ENOMEM possibilities even with GFP_ATOMIC.
Hmmm... We can add a WARN_ON_ONCE() there but do we really care? If
the caller is using GFP_ATOMIC, it should be expecting unreliability.
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