linux-kernel - Re: [PATCH RESEND v2 1/7] PCI: merge slot and bus reset implementations

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Date:   Thu, 20 May 2021 16:54:50 +0200
From:   Krzysztof Wilczyński <kw@...ux.com>
To:     Amey Narkhede <ameynarkhede03@...il.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, alex.williamson@...hat.com,
        raphael.norwitz@...anix.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v2 1/7] PCI: merge slot and bus reset
 implementations

Hi Amey,

Thank you for working on this!  Few comments and suggestions below.

[...]
> Link: https://lkml.org/lkml/2021/3/23/911

Linking to lkml.org is fine, however it became a canon now to link to
lore, so this would be:

  https://lore.kernel.org/lkml/20210323100625.0021a943@omen.home.shazbot.org/

I personally find it a bit easier to read on lore compared to lkml.org
when it goes to a large and long running threads.

[...]
> +int pci_reset_bus_function(struct pci_dev *dev, int probe)
> +{
> +	int rc = pci_dev_reset_slot_function(dev, probe);
> +
> +	if (rc != -ENOTTY)
> +		return rc;
> +	return pci_parent_bus_reset(dev, probe);
> +}

Depends on the style, but I would suggest using a boolean type for the
probe argument here and in the other functions that enable or disable
something.  I makes the intent clear, and this is also a popular pattern
you can see throughout the PCI tree.

Also, I would suggest adding a newline to separate final return, so that
it's easier to read the code, and to keep things consistent.

[...]
> -	rc = pci_dev_reset_slot_function(dev, 0);
> -	if (rc != -ENOTTY)
> -		return rc;
> -	return pci_parent_bus_reset(dev, 0);
> +	return pci_reset_bus_function(dev, 0);

See above about using boolean type here.

[...]
> -	rc = pci_dev_reset_slot_function(dev, 1);
>  	if (rc != -ENOTTY)
>  		return rc;
>  
> -	return pci_parent_bus_reset(dev, 1);
> +	return pci_reset_bus_function(dev, 1);

Same as above.

Krzysztof