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

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Date:	Fri, 7 Oct 2011 11:00:22 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Greg KH <greg@...ah.com>
Cc:	"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,
	Grant Likely <grant.likely@...retlab.ca>,
	Dilan Lee <dilee@...dia.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 Thu, Oct 06, 2011 at 11:43:49PM -0700, Greg KH 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?  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?

There was some discussion of this in the previous patch round before the
code was changed - it does end up adding an externally visible error
code but it doesn't really make any difference, especially if we don't
propagate it externally.  We've already got some other codes in a
similar style, though I can't remember the examples that were quoted
offhand.  Adding the new code avoids confusion about exactly what the
intent of the driver is.
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