linux-kernel - Re: [PATCH 3/5] staging: vme: add functions for bridge module refcounting

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Date:	Tue, 23 Aug 2011 11:09:02 +0200
From:	Manohar Vanga <manohar.vanga@...n.ch>
To:	Martyn Welch <martyn.welch@...com>
CC:	"Emilio G. Cota" <cota@...ap.org>, <gregkh@...e.de>,
	<devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] staging: vme: add functions for bridge module
 refcounting

Hey Martyn,

Thanks for testing this out. Sorry for the inactivity last week, I have been
busy with some unrelated work. I will resend the patches by the end of this
week with the correct fixes.

Thanks again!

On Mon, Aug 22, 2011 at 01:24:59PM +0100, Martyn Welch wrote:
> On 13/08/11 08:47, Emilio G. Cota wrote:
> > On Fri, Aug 12, 2011 at 12:30:49 +0200, Manohar Vanga wrote:
> >> +	struct vme_bridge *bridge;
> >> +
> >> +	mutex_lock(&vme_buses_lock);
> >> +	list_for_each_entry(bridge, &vme_bus_list, bus_list) {
> >> +		if (bridge->num == bus_id) {
> >> +			if (!bridge->owner)
> >> +				dev_warn(bridge->parent,
> >> +					"bridge->owner not set\n");
> > 
> > Don't do this; it will throw a false warning if the kernel is
> > built without module support. Note that in that case
> > 
> > 	THIS_MODULE == (struct module *)0.
> > 
> > try_module_get() and module_put() do the right thing for all
> > possible configs. Trust them.
> > 
> 
> I can confirm that this does break when the bridge is compiled into the kernel.
> 
> Martyn
> 
> -- 
> Martyn Welch (Principal Software Engineer) | Registered in England and
> GE Intelligent Platforms                   | Wales (3828642) at 100
> T +44(0)1327322748                         | Barbirolli Square, Manchester,
> E martyn.welch@...com                      | M2 3AB  VAT:GB 927559189

-- 
/manohar
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