linux-kernel - Re: [PATCH] fpga: dfl-pci: Drop redundant pci_enable_pcie_error

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Message-ID: <ZAf/Isgkh6GoApp4@yilunxu-OptiPlex-7050>
Date:   Wed, 8 Mar 2023 11:21:06 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Wu Hao <hao.wu@...el.com>, Tom Rix <trix@...hat.com>,
        Moritz Fischer <mdf@...nel.org>, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH] fpga: dfl-pci: Drop redundant
 pci_enable_pcie_error_reporting()

On 2023-03-07 at 14:19:37 -0600, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> pci_enable_pcie_error_reporting() enables the device to send ERR_*
> Messages.  Since f26e58bf6f54 ("PCI/AER: Enable error reporting when AER is
> native"), the PCI core does this for all devices during enumeration, so the
> driver doesn't need to do it itself.
> 
> Remove the redundant pci_enable_pcie_error_reporting() call from the
> driver.  Also remove the corresponding pci_disable_pcie_error_reporting()
> from the driver .remove() path.
> 
> Note that this only controls ERR_* Messages from the device.  An ERR_*
> Message may cause the Root Port to generate an interrupt, depending on the
> AER Root Error Command register managed by the AER service driver.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>

Acked-by: Xu Yilun <yilun.xu@...el.com>

I see f26e58bf6f54 in v6.2, so I think it's OK to apply to for-6.3

Thanks,
Yilun

> ---
>  drivers/fpga/dfl-pci.c | 20 ++++++--------------
>  1 file changed, 6 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c
> index 0914e7328b1a..1bc04378118c 100644
> --- a/drivers/fpga/dfl-pci.c
> +++ b/drivers/fpga/dfl-pci.c
> @@ -21,7 +21,6 @@
>  #include <linux/module.h>
>  #include <linux/stddef.h>
>  #include <linux/errno.h>
> -#include <linux/aer.h>
>  
>  #include "dfl.h"
>  
> @@ -376,10 +375,6 @@ int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
>  		return ret;
>  	}
>  
> -	ret = pci_enable_pcie_error_reporting(pcidev);
> -	if (ret && ret != -EINVAL)
> -		dev_info(&pcidev->dev, "PCIE AER unavailable %d.\n", ret);
> -
>  	pci_set_master(pcidev);
>  
>  	ret = dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(64));
> @@ -387,24 +382,22 @@ int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
>  		ret = dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(32));
>  	if (ret) {
>  		dev_err(&pcidev->dev, "No suitable DMA support available.\n");
> -		goto disable_error_report_exit;
> +		return ret;
>  	}
>  
>  	ret = cci_init_drvdata(pcidev);
>  	if (ret) {
>  		dev_err(&pcidev->dev, "Fail to init drvdata %d.\n", ret);
> -		goto disable_error_report_exit;
> +		return ret;
>  	}
>  
>  	ret = cci_enumerate_feature_devs(pcidev);
> -	if (!ret)
> +	if (ret) {
> +		dev_err(&pcidev->dev, "enumeration failure %d.\n", ret);
>  		return ret;
> +	}
>  
> -	dev_err(&pcidev->dev, "enumeration failure %d.\n", ret);
> -
> -disable_error_report_exit:
> -	pci_disable_pcie_error_reporting(pcidev);
> -	return ret;
> +	return 0;
>  }
>  
>  static int cci_pci_sriov_configure(struct pci_dev *pcidev, int num_vfs)
> @@ -448,7 +441,6 @@ static void cci_pci_remove(struct pci_dev *pcidev)
>  		cci_pci_sriov_configure(pcidev, 0);
>  
>  	cci_remove_feature_devs(pcidev);
> -	pci_disable_pcie_error_reporting(pcidev);
>  }
>  
>  static struct pci_driver cci_pci_driver = {
> -- 
> 2.25.1
>