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

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Date:   Thu, 25 Feb 2021 22:49:54 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Uwe Kleine-König <uwe@...ine-koenig.org>,
        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>
Cc:     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 v2] vio: make remove callback return void

Uwe Kleine-König <uwe@...ine-koenig.org> writes:
> 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.

I'm 99% sure there's no connection between the two implementations,
other than the name.

So splitting the patch by arch would make it easier to merge. I'm
reluctant to merge changes to sparc code.

The list of powerpc specific drivers is:

  drivers/char/hw_random/pseries-rng.c
  drivers/char/tpm/tpm_ibmvtpm.c
  drivers/crypto/nx/nx-842-pseries.c
  drivers/crypto/nx/nx.c
  drivers/misc/ibmvmc.c
  drivers/net/ethernet/ibm/ibmveth.c
  drivers/net/ethernet/ibm/ibmvnic.c
  drivers/scsi/ibmvscsi/ibmvfc.c
  drivers/scsi/ibmvscsi/ibmvscsi.c
  drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
  drivers/tty/hvc/hvcs.c

cheers