linux-kernel - Re: [PATCH v1 0/5] PCI: Drop duplicated tracking of a pci

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Date:   Fri, 30 Jul 2021 19:48:20 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        Rafał Miłecki <zajec5@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Alexander Duyck <alexanderduyck@...com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sathya Prakash <sathya.prakash@...adcom.com>,
        oss-drivers@...igine.com, Oliver O'Halloran <oohall@...il.com>,
        Russell Currey <ruscur@...sell.cc>,
        Jiri Olsa <jolsa@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        linux-perf-users@...r.kernel.org,
        Stefano Stabellini <sstabellini@...nel.org>,
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        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v1 0/5] PCI: Drop duplicated tracking of a pci_dev's
 bound driver

Hi Andy,

On Fri, Jul 30, 2021 at 11:06:20AM +0300, Andy Shevchenko wrote:
> On Thu, Jul 29, 2021 at 10:37:35PM +0200, Uwe Kleine-König wrote:
> > struct pci_dev tracks the bound pci driver twice. This series is about
> > removing this duplication.
> > 
> > The first two patches are just cleanups. The third patch introduces a
> > wrapper that abstracts access to struct pci_dev->driver. In the next
> > patch (hopefully) all users are converted to use the new wrapper and
> > finally the fifth patch removes the duplication.
> > 
> > Note this series is only build tested (allmodconfig on several
> > architectures).
> > 
> > I'm open to restructure this series if this simplifies things. E.g. the
> > use of the new wrapper in drivers/pci could be squashed into the patch
> > introducing the wrapper. Patch 4 could be split by maintainer tree or
> > squashed into patch 3 completely.
> 
> I see only patch 4 and this cover letter...

The full series is available at

	https://lore.kernel.org/linux-pci/20210729203740.1377045-1-u.kleine-koenig@pengutronix.de/

All patches but #4 only touch drivers/pci/ (and include/linux/pci.h) and
it seemed excessive to me to send all patches to all people. It seems at
least for you I balanced this wrongly. The short version is that patch
#3 introduces

	+#define pci_driver_of_dev(pdev) ((pdev)->driver)

which allows to do the stuff done in patch #4 and then patch #5 does

	-#define pci_driver_of_dev(pdev) ((pdev)->driver)
	+#define pci_driver_of_dev(pdev) ((pdev)->dev.driver ? to_pci_driver((pdev)->dev.driver) : NULL)

plus some cleanups.

If you want I can send you a bounce (or you try

	b4 am 20210729203740.1377045-1-u.kleine-koenig@...gutronix.de

).

Best regards and thanks for caring,
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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