linux-kernel - Re: [PATCH v2] vio: make remove callback return void

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Message-ID: <CADxRZqzG7jtNwYsdnO1xm8FLes_+GqTB=2naxaUTP2MNkzGG3g@mail.gmail.com>
Date:   Wed, 24 Feb 2021 14:01:06 +0300
From:   Anatoly Pugachev <matorola@...il.com>
To:     Uwe Kleine-König <uwe@...ine-koenig.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jens Axboe <axboe@...nel.dk>, Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Haren Myneni <haren@...ibm.com>,
        Breno Leitão <leitao@...ian.org>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Paulo Flabiano Smorigo <pfsmorigo@...il.com>,
        Steven Royer <seroyer@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Cristobal Forno <cforno12@...ux.ibm.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Dany Madden <drt@...ux.ibm.com>, Lijun Pan <ljp@...ux.ibm.com>,
        Sukadev Bhattiprolu <sukadev@...ux.ibm.com>,
        Tyrel Datwyler <tyreld@...ux.ibm.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Michael Cyr <mikecyr@...ux.ibm.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        linuxppc-dev@...ts.ozlabs.org,
        Linux Kernel list <linux-kernel@...r.kernel.org>,
        Sparc kernel list <sparclinux@...r.kernel.org>,
        linux-block@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-integrity@...r.kernel.org, netdev@...r.kernel.org,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org
Subject: Re: [PATCH v2] vio: make remove callback return void

On Wed, Feb 24, 2021 at 11:17 AM Uwe Kleine-König <uwe@...ine-koenig.org> wrote:
>
> The driver core ignores the return value of struct bus_type::remove()
> because there is only little that can be done. To simplify the quest to
> make this function return void, let struct vio_driver::remove() return
> void, too. All users already unconditionally return 0, this commit makes
> it obvious that returning an error code is a bad idea and makes it
> obvious for future driver authors that returning an error code isn't
> intended.
>
> Note there are two nominally different implementations for a vio bus:
> one in arch/sparc/kernel/vio.c and the other in
> arch/powerpc/platforms/pseries/vio.c. I didn't care to check which
> driver is using which of these busses (or if even some of them can be
> used with both) and simply adapt all drivers and the two bus codes in
> one go.

Applied over current git kernel, boots on my sparc64 LDOM (sunvdc
block driver which uses vio).
Linux ttip 5.11.0-10201-gc03c21ba6f4e-dirty #189 SMP Wed Feb 24
13:48:37 MSK 2021 sparc64 GNU/Linux
boot logs (and kernel config) on [1] for "5.11.0-10201-gc03c21ba6f4e-dirty".
Up to you to add "tested-by".
Thanks.

1. https://github.com/mator/sparc64-dmesg

PS: going to check with ppc64 later as well on LPAR (uses vio).