linux-kernel - Re: [RFC PATCH 05/13] driver core: firmware loader: introduce firmware

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Message-ID: <20120726100806.GC30717@aftab.osrc.amd.com>
Date:	Thu, 26 Jul 2012 12:08:06 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 05/13] driver core: firmware loader: introduce
 firmware_buf

On Thu, Jul 26, 2012 at 10:51:55AM +0800, Ming Lei wrote:
> On Wed, Jul 25, 2012 at 9:59 PM, Borislav Petkov <bp@...64.org> wrote:
> 
> > This is subtle: the caller of fw_free_buf might forget to assign NULL to
> > the buf ptr.
> 
> Who is the caller? Since it is always called inside firmware loader, we should
> make sure that.
> 
> > Why not pass struct firmware_priv *fw_priv to the function instead and ...
> 
> No, it shouldn't. The lifetime of fw_priv is just same with request_firmware or
> its work_func pair, but firmware_buf may live much longer than fw_priv. You
> will see that fw_free_buf is the release function of kref in firmware_buf.

Actually, this is all moot since you're changing all this in later
patches. I'm staring at the code after patch 10/13 and the check is
gone.

So nevermind.

[ … ]

> Suppose you are right, it shouldn't be done in this patch since this
> patch just converts to firmware_buf.

Wherever you find its suitable.

Thanks.

-- 
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Boris.

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