linux-kernel - Re: [PATCH v1 2/4] firmware loader: simplify holding module for request

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Message-ID: <20140107172342.GA31842@core.coreip.homeip.net>
Date:	Tue, 7 Jan 2014 09:23:42 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/4] firmware loader: simplify holding module for
 request_firmware

On Tue, Jan 07, 2014 at 10:53:57PM +0800, Ming Lei wrote:
> Hi Dmitry,
> 
> On Tue, Jan 7, 2014 at 3:56 PM, Dmitry Torokhov
> <dmitry.torokhov@...il.com> wrote:
> > Hi Ming,
> >
> > On Thu, Jun 06, 2013 at 08:01:48PM +0800, Ming Lei wrote:
> >> module reference doesn't cover direct loading path, so this patch
> >> simply holds the module in the whole life time of request_firmware()
> >> to fix the problem.
> >
> > This does not make sense to me. If request_firmware() is executing that
> > means some other module references it and module refcount already
> > reflects that.
> 
> Yes, you are right, holding this module references in both
> request_firmware() and request_firmware_direct() shouldn't
> be necessary.
> 
> >
> > We needed to pin module before Tejun's work ensuring that currently open
> > sysfs entries won't keep related kobjects pinned after kernel marked
> > them inactive. We can probably delete __module_get()/module_put() from
> > firmware_class.c now.
> 
> But holding the reference for request_firmware_nowait() is needed.

Ah, yes, of course.

Thanks.

-- 
Dmitry
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