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

Greg KH
2011-10-08T00:13:28Z

On Fri, Oct 07, 2011 at 07:28:33PM -0400, Valdis.Kletnieks@vt.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@kroah.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