linux-kernel - Re: [PATCH] PCI: xgene: fix a mistake about cfg address

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Date:   Tue, 30 Mar 2021 14:19:26 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Dejin Zheng <zhengdejin5@...il.com>
Cc:     toan@...amperecomputing.com, lorenzo.pieralisi@....com,
        robh@...nel.org, bhelgaas@...gle.com,
        gustavo.pimentel@...opsys.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, dann.frazier@...onical.com
Subject: Re: [PATCH] PCI: xgene: fix a mistake about cfg address

On Sun, Mar 28, 2021 at 10:41:18PM +0800, Dejin Zheng wrote:
> It has a wrong modification to the xgene driver by the commit
> e2dcd20b1645a. it use devm_platform_ioremap_resource_byname() to
> simplify codes and remove the res variable, But the following code
> needs to use this res variable, So after this commit, the port->cfg_addr
> will get a wrong address. Now, revert it.
> 
> Fixes: e2dcd20b1645a ("PCI: controller: Convert to devm_platform_ioremap_resource_byname()")
> Reported-by: dann.frazier@...onical.com
> Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>

This looks right to me, but since e2dcd20b1645a appeared in v5.9-rc1,
I think it should have:

  Cc: stable@...r.kernel.org	# v5.9+

> ---
>  drivers/pci/controller/pci-xgene.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pci-xgene.c b/drivers/pci/controller/pci-xgene.c
> index 2afdc865253e..7f503dd4ff81 100644
> --- a/drivers/pci/controller/pci-xgene.c
> +++ b/drivers/pci/controller/pci-xgene.c
> @@ -354,7 +354,8 @@ static int xgene_pcie_map_reg(struct xgene_pcie_port *port,
>  	if (IS_ERR(port->csr_base))
>  		return PTR_ERR(port->csr_base);
>  
> -	port->cfg_base = devm_platform_ioremap_resource_byname(pdev, "cfg");
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
> +	port->cfg_base = devm_ioremap_resource(dev, res);
>  	if (IS_ERR(port->cfg_base))
>  		return PTR_ERR(port->cfg_base);
>  	port->cfg_addr = res->start;
> -- 
> 2.30.1
>