linux-kernel - Re: module: fix module_refcount() return when running in a module exit routine

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Message-ID: <1421683644.2080.24.camel@HansenPartnership.com>
Date:	Mon, 19 Jan 2015 08:07:24 -0800
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: module: fix module_refcount() return when running in a module
 exit routine

On Mon, 2015-01-19 at 00:28 -0800, Christoph Hellwig wrote:
> On Mon, Jan 19, 2015 at 04:21:15PM +1030, Rusty Russell wrote:
> > The first one I think should be eliminated, and the second one is simply
> > an assertion before calling module_put() (which should probably be
> > eliminated).  The others are just printing information.
> 
> FYI, I've got a pathcset to eliminate the use of module_refcount in
> SCSI, which was a horrible hack to start with, but it needs a little more
> clarification / work, so I'd prefer to do it for 3.20.  Bart has a fix
> that eliminates it for 3.19, which piles aother bandaid over the bandaid
> that introduced the use module_refcount, and James doesn't seem to like
> it.

I don't like adding another refcount where one already exists because
it's pointless duplication.  Rusty's fix is fine because it captures the
intention of the use in scsi_device_get, so let's go with it.  You can
add an Acked-by from me to his patch.

James



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