linux-kernel - Re: [PATCH] bus: mhi: host: pci_generic: Drop redundant pci_enable_pcie_error

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Message-ID: <20230308052108.GA5124@thinkpad>
Date:   Wed, 8 Mar 2023 10:51:08 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH] bus: mhi: host: pci_generic: Drop redundant
 pci_enable_pcie_error_reporting()

On Tue, Mar 07, 2023 at 02:16:25PM -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>

Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>

Thanks,
Mani

> ---
>  drivers/bus/mhi/host/pci_generic.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
> index f39657f71483..6e13c43a84d1 100644
> --- a/drivers/bus/mhi/host/pci_generic.c
> +++ b/drivers/bus/mhi/host/pci_generic.c
> @@ -8,7 +8,6 @@
>   * Copyright (C) 2020 Linaro Ltd <loic.poulain@...aro.org>
>   */
>  
> -#include <linux/aer.h>
>  #include <linux/delay.h>
>  #include <linux/device.h>
>  #include <linux/mhi.h>
> @@ -903,11 +902,9 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	mhi_pdev->pci_state = pci_store_saved_state(pdev);
>  	pci_load_saved_state(pdev, NULL);
>  
> -	pci_enable_pcie_error_reporting(pdev);
> -
>  	err = mhi_register_controller(mhi_cntrl, mhi_cntrl_config);
>  	if (err)
> -		goto err_disable_reporting;
> +		return err;
>  
>  	/* MHI bus does not power up the controller by default */
>  	err = mhi_prepare_for_power_up(mhi_cntrl);
> @@ -941,8 +938,6 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	mhi_unprepare_after_power_down(mhi_cntrl);
>  err_unregister:
>  	mhi_unregister_controller(mhi_cntrl);
> -err_disable_reporting:
> -	pci_disable_pcie_error_reporting(pdev);
>  
>  	return err;
>  }
> @@ -965,7 +960,6 @@ static void mhi_pci_remove(struct pci_dev *pdev)
>  		pm_runtime_get_noresume(&pdev->dev);
>  
>  	mhi_unregister_controller(mhi_cntrl);
> -	pci_disable_pcie_error_reporting(pdev);
>  }
>  
>  static void mhi_pci_shutdown(struct pci_dev *pdev)
> -- 
> 2.25.1
> 

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