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

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Date:	Thu, 6 Oct 2011 23:43:49 -0700
From:	Greg KH <greg@...ah.com>
To:	"G, Manjunath Kondaiah" <manjugk@...com>
Cc:	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>,
	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 10:33:06AM +0500, G, Manjunath Kondaiah wrote:
> 
> Add new error value so that drivers can request deferred probe
> from drivercore.
> 
> Signed-off-by: G, Manjunath Kondaiah <manjugk@...com>
> Reported-by: Grant Likely <grant.likely@...retlab.ca>
> ---
> Cc: linux-omap@...r.kernel.org
> Cc: linux-mmc@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: Greg Kroah-Hartman <greg@...ah.com>
> Cc: Dilan Lee <dilee@...dia.com>
> Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> Cc: Manjunath GKondaiah <manjunath.gkondaiah@...aro.org>
> Cc: Arnd Bergmann <arnd@...db.de>
> 
>  include/linux/errno.h |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/errno.h b/include/linux/errno.h
> index 4668583..83d8fcf 100644
> --- a/include/linux/errno.h
> +++ b/include/linux/errno.h
> @@ -16,6 +16,7 @@
>  #define ERESTARTNOHAND	514	/* restart if no handler.. */
>  #define ENOIOCTLCMD	515	/* No ioctl command */
>  #define ERESTART_RESTARTBLOCK 516 /* restart by calling sys_restart_syscall */
> +#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?

greg k-h
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