linux-kernel - Re: [RFC PATCH 2/3] pci/doe: Use devm_xa

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Date:   Thu, 7 Jul 2022 11:06:46 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     ira.weiny@...el.com
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [RFC PATCH 2/3] pci/doe: Use devm_xa_init()

On Tue, Jul 05, 2022 at 04:21:58PM -0700, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> The XArray being used to store the protocols does not even store
> allocated objects.

I guess the point is that the doe_mb->prots XArray doesn't reference
any other objects that would need to be freed when destroying
doe_mb->prots?  A few more words here would make the commit log more
useful to non-XArray experts.

s|pci/doe|PCI/DOE| in subject to match the drivers/pci convention.

> Use devm_xa_init() to automatically destroy the XArray when the PCI
> device goes away.
> 
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> ---
>  drivers/pci/doe.c | 14 ++------------
>  1 file changed, 2 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/pci/doe.c b/drivers/pci/doe.c
> index 0b02f33ef994..aa36f459d375 100644
> --- a/drivers/pci/doe.c
> +++ b/drivers/pci/doe.c
> @@ -386,13 +386,6 @@ static int pci_doe_cache_protocols(struct pci_doe_mb *doe_mb)
>  	return 0;
>  }
>  
> -static void pci_doe_xa_destroy(void *mb)
> -{
> -	struct pci_doe_mb *doe_mb = mb;
> -
> -	xa_destroy(&doe_mb->prots);
> -}
> -
>  static void pci_doe_destroy_workqueue(void *mb)
>  {
>  	struct pci_doe_mb *doe_mb = mb;
> @@ -440,11 +433,8 @@ struct pci_doe_mb *pcim_doe_create_mb(struct pci_dev *pdev, u16 cap_offset)
>  	doe_mb->pdev = pdev;
>  	doe_mb->cap_offset = cap_offset;
>  	init_waitqueue_head(&doe_mb->wq);
> -
> -	xa_init(&doe_mb->prots);
> -	rc = devm_add_action(dev, pci_doe_xa_destroy, doe_mb);
> -	if (rc)
> -		return ERR_PTR(rc);
> +	if (devm_xa_init(dev, &doe_mb->prots))
> +		return ERR_PTR(-ENOMEM);
>  
>  	doe_mb->work_queue = alloc_ordered_workqueue("DOE: [%x]", 0,
>  						     doe_mb->cap_offset);
> -- 
> 2.35.3
>