linux-kernel - Re: [PATCH v3 03/10] cxl/pci: Fix NULL vs ERR

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Date:   Sat, 9 Oct 2021 20:44:13 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     linux-cxl@...r.kernel.org, stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, hch@....de
Subject: Re: [PATCH v3 03/10] cxl/pci: Fix NULL vs ERR_PTR confusion

On Sat, Oct 09, 2021 at 09:44:13AM -0700, Dan Williams wrote:
> cxl_pci_map_regblock() may return an ERR_PTR(), but cxl_pci_setup_regs()
> is only prepared for NULL as the error case.
> 
> Fixes: f8a7e8c29be8 ("cxl/pci: Reserve all device regions at once")
> Cc: <stable@...r.kernel.org>
> Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Cc: Ira Weiny <ira.weiny@...el.com>

Reviewed-by: Ira Weiny <ira.weiny@...el.com>

> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  drivers/cxl/pci.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
> index ccc7c2573ddc..9c178002d49e 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -317,7 +317,7 @@ static void __iomem *cxl_pci_map_regblock(struct cxl_mem *cxlm,
>  	if (pci_resource_len(pdev, bar) < offset) {
>  		dev_err(dev, "BAR%d: %pr: too small (offset: %#llx)\n", bar,
>  			&pdev->resource[bar], (unsigned long long)offset);
> -		return IOMEM_ERR_PTR(-ENXIO);
> +		return NULL;
>  	}
>  
>  	addr = pci_iomap(pdev, bar, 0);
>