linux-kernel - Re: [PATCH 2/10] sysdev: add error check in sysdev

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Date:	Tue, 17 Jul 2007 01:18:22 +0900
From:	"Akinobu Mita" <akinobu.mita@...il.com>
To:	"Cornelia Huck" <cornelia.huck@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, "Greg Kroah-Hartman" <gregkh@...e.de>
Subject: Re: [PATCH 2/10] sysdev: add error check in sysdev_register()

2007/7/17, Cornelia Huck <cornelia.huck@...ibm.com>:
> On Mon, 16 Jul 2007 22:51:38 +0900,
> Akinobu Mita <akinobu.mita@...il.com> wrote:
>
> > This patch enables to catch the errors returned by add() procedure of
> > sysdev driver in sysdev_register.
>
> > @@ -253,23 +254,50 @@ int sysdev_register(struct sys_device *
> >
> >               /* Notify global drivers */
> >               list_for_each_entry(drv, &sysdev_drivers, entry) {
> > -                     if (drv->add)
> > -                             drv->add(sysdev);
> > +                     if (drv->add) {
> > +                             error = drv->add(sysdev);
> > +                             if (error)
> > +                                     goto error_sysdev;
> > +                     }
> > +                     added_sysdev++;
> >               }
>
> This looks asymmetric to me. Imagine we have a device/driver
> combination for which drv->add will return -ESOMEERROR. Now, it depends
> on the order:
>
> 1. The device is registered when the driver is already registered:
> registration of the device will fail.
>
> 2. The driver is registered when the device is already registered:
> driver registration will succeed, and the device will stay registered.
>
> I'm not sure if that is what we really want.

Thanks, I didn't realize the asymmetry.
I think we need to add same check to sysdev_driver_register().
But I need to check every sysdev driver's add() functions before
making this change. So this patch dropped from this series of patches
for now.
-
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