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

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Message-ID: <YBwcDmtefa2WmS90@kroah.com>
Date:   Thu, 4 Feb 2021 17:08:46 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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>,
        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@...r.kernel.org,
        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] vio: make remove callback return void

On Wed, Jan 27, 2021 at 10:50:10PM +0100, Uwe Kleine-König 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.
> 
> Note that for the powerpc implementation there is a semantical change:
> Before this patch for a device that was bound to a driver without a
> remove callback vio_cmo_bus_remove(viodev) wasn't called. As the device
> core still considers the device unbound after vio_bus_remove() returns
> calling this unconditionally is the consistent behaviour which is
> implemented here.
> 
> Signed-off-by: Uwe Kleine-König <uwe@...ine-koenig.org>
> ---
> Hello,
> 
> note that this change depends on
> https://lore.kernel.org/r/20210121062005.53271-1-ljp@linux.ibm.com which removes
> an (ignored) return -EBUSY in drivers/net/ethernet/ibm/ibmvnic.c.
> I don't know when/if this latter patch will be applied, so it might take
> some time until my patch can go in.

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>