linux-kernel - Re: [PATCH 5/6] PCI/ASPM: Clean up disable link state parameter

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Date:   Fri, 17 Nov 2023 16:05:14 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Nirmal Patel <nirmal.patel@...ux.intel.com>,
        Jonathan Derrick <jonathan.derrick@...ux.dev>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] PCI/ASPM: Clean up disable link state parameter

On Tue, Nov 14, 2023 at 02:55:52PM +0100, Johan Hovold wrote:
> Replace the current 'sem' parameter to the __pci_disable_link_state()
> helper with a more descriptive 'locked' parameter, which indicates
> whether a pci_bus_sem read lock is already held.
> 
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

>  drivers/pci/pcie/aspm.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
> index 8cf8cc2d6bba..19b7256d2dc9 100644
> --- a/drivers/pci/pcie/aspm.c
> +++ b/drivers/pci/pcie/aspm.c
> @@ -1041,7 +1041,7 @@ static struct pcie_link_state *pcie_aspm_get_link(struct pci_dev *pdev)
>  	return bridge->link_state;
>  }
>  
> -static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem)
> +static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool locked)
>  {
>  	struct pcie_link_state *link = pcie_aspm_get_link(pdev);
>  
> @@ -1060,7 +1060,7 @@ static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem)
>  		return -EPERM;
>  	}
>  
> -	if (sem)
> +	if (!locked)
>  		down_read(&pci_bus_sem);
>  	mutex_lock(&aspm_lock);
>  	if (state & PCIE_LINK_STATE_L0S)
> @@ -1082,7 +1082,7 @@ static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem)
>  		link->clkpm_disable = 1;
>  	pcie_set_clkpm(link, policy_to_clkpm_state(link));
>  	mutex_unlock(&aspm_lock);
> -	if (sem)
> +	if (!locked)
>  		up_read(&pci_bus_sem);
>  
>  	return 0;
> @@ -1090,7 +1090,7 @@ static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem)
>  
>  int pci_disable_link_state_locked(struct pci_dev *pdev, int state)
>  {
> -	return __pci_disable_link_state(pdev, state, false);
> +	return __pci_disable_link_state(pdev, state, true);
>  }
>  EXPORT_SYMBOL(pci_disable_link_state_locked);
>  
> @@ -1105,7 +1105,7 @@ EXPORT_SYMBOL(pci_disable_link_state_locked);
>   */
>  int pci_disable_link_state(struct pci_dev *pdev, int state)
>  {
> -	return __pci_disable_link_state(pdev, state, true);
> +	return __pci_disable_link_state(pdev, state, false);
>  }
>  EXPORT_SYMBOL(pci_disable_link_state);
>  
> -- 
> 2.41.0
> 

-- 
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