netdev - Re: [PATCH v2 6/9] ethernet: stmicro: Simplify PCI devres usage

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Message-ID: <CAHp75VduuT=VLtXS+zha4ZNe3ZvBV-jgZpn2oP4WkzDdt6Pnog@mail.gmail.com>
Date: Wed, 21 Aug 2024 11:14:21 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Philipp Stanner <pstanner@...hat.com>
Cc: Jonathan Corbet <corbet@....net>, Jens Axboe <axboe@...nel.dk>, Wu Hao <hao.wu@...el.com>, 
	Tom Rix <trix@...hat.com>, Moritz Fischer <mdf@...nel.org>, Xu Yilun <yilun.xu@...el.com>, 
	Andy Shevchenko <andy@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, 
	Bartosz Golaszewski <brgl@...ev.pl>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu <joabreu@...opsys.com>, 
	Maxime Coquelin <mcoquelin.stm32@...il.com>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Alvaro Karsz <alvaro.karsz@...id-run.com>, "Michael S. Tsirkin" <mst@...hat.com>, 
	Jason Wang <jasowang@...hat.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
	Eugenio Pérez <eperezma@...hat.com>, 
	Richard Cochran <richardcochran@...il.com>, Mark Brown <broonie@...nel.org>, 
	David Lechner <dlechner@...libre.com>, 
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, 
	Damien Le Moal <dlemoal@...nel.org>, Hannes Reinecke <hare@...e.de>, Keith Busch <kbusch@...nel.org>, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-block@...r.kernel.org, linux-fpga@...r.kernel.org, 
	linux-gpio@...r.kernel.org, netdev@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org, 
	virtualization@...ts.linux.dev
Subject: Re: [PATCH v2 6/9] ethernet: stmicro: Simplify PCI devres usage

On Wed, Aug 21, 2024 at 10:19 AM Philipp Stanner <pstanner@...hat.com> wrote:
>
> stmicro uses PCI devres in the wrong way. Resources requested
> through pcim_* functions don't need to be cleaned up manually in the
> remove() callback or in the error unwind path of a probe() function.

> Moreover, there is an unnecessary loop which only requests and ioremaps
> BAR 0, but iterates over all BARs nevertheless.

Seems like loongson was cargo-culted a lot without a clear
understanding of this code in the main driver...

> Furthermore, pcim_iomap_regions() and pcim_iomap_table() have been
> deprecated by the PCI subsystem in commit e354bb84a4c1 ("PCI: Deprecate
> pcim_iomap_table(), pcim_iomap_regions_request_all()").
>
> Replace these functions with pcim_iomap_region().
>
> Remove the unnecessary manual pcim_* cleanup calls.
>
> Remove the unnecessary loop over all BARs.

...

> -       for (i = 0; i < PCI_STD_NUM_BARS; i++) {
> -               if (pci_resource_len(pdev, i) == 0)
> -                       continue;
> -               pcim_iounmap_regions(pdev, BIT(i));

Here is the BARx, which contradicts the probe :-)

> -               break;
> -       }

-- 
With Best Regards,
Andy Shevchenko