linux-kernel - Re: [PATCH 7/9] ethernet: stmicro: Simplify PCI devres usage

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Message-ID: <ZsOO2uuGmD97Mocj@smile.fi.intel.com>
Date: Mon, 19 Aug 2024 21:28:42 +0300
From: Andy Shevchenko <andy@...nel.org>
To: Philipp Stanner <pstanner@...hat.com>
Cc: onathan 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>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
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Subject: Re: [PATCH 7/9] ethernet: stmicro: Simplify PCI devres usage

On Mon, Aug 19, 2024 at 06:51:47PM +0200, Philipp Stanner 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.
> 
> 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.

...

loongson_dwmac_probe()

> +	memset(&res, 0, sizeof(res));
> +	res.addr = pcim_iomap_region(pdev, 0, pci_name(pdev));
> +	if (IS_ERR(res.addr)) {
> +		ret = PTR_ERR(res.addr);
> +		goto err_disable_device;

It seems your series reveals issues in the error paths of .probe():s
in many drivers...

If we use pcim variant to enable device, why do we need to explicitly
disable it?

>  	}

...

loongson_dwmac_remove()

>  	pci_disable_msi(pdev);
>  	pci_disable_device(pdev);

Not sure why we need these either...

-- 
With Best Regards,
Andy Shevchenko