linux-kernel - Re: [PATCH 1/5] drivercore: add new error value for deferred probe

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Date:	Fri, 7 Oct 2011 17:12:37 -0700
From:	Greg KH <greg@...ah.com>
To:	Valdis.Kletnieks@...edu
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	"G, Manjunath Kondaiah" <manjugk@...com>,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dilan Lee <dilee@...dia.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Manjunath GKondaiah <manjunath.gkondaiah@...aro.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 1/5] drivercore: add new error value for deferred probe

On Fri, Oct 07, 2011 at 07:28:33PM -0400, Valdis.Kletnieks@...edu wrote:
> On Fri, 07 Oct 2011 16:12:45 MDT, Grant Likely said:
> > On Fri, Oct 7, 2011 at 12:43 AM, Greg KH <greg@...ah.com> wrote:
> > > On Fri, Oct 07, 2011 at 10:33:06AM +0500, G, Manjunath Kondaiah wrote:
> 
> > >> +#define EPROBE_DEFER 517     /* restart probe again after some time */
> > >
> > > Can we really do this?
> 
> > According to Arnd, yes this is okay.
> 
> > >  Isn't this some user/kernel api here?
> 
> > > What's wrong with just "overloading" on top of an existing error code?
> > > Surely one of the other 516 types could be used here, right?
> 
> > overloading makes it really hard to find the users at a later date.
> 
> Would proposing '#define EPROBE_DEFER EAGAIN' be acceptable to everybody? That
> would allow overloading EAGAIN, but still make it easy to tell the usages apart
> if we need to separate them later...

Yes, please do that, it is what USB does for it's internal error code
handling.

greg k-h
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