linux-kernel - Re: [v3] PCI: tegra194: Fix debugfs directory creation when CONFIG

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Message-ID: <580c1b6a-ba32-48ea-9fd8-59884d0dbcbf@wanadoo.fr>
Date: Mon, 7 Apr 2025 21:43:10 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Hans Zhang <18255117159@....com>, lpieralisi@...nel.org
Cc: manivannan.sadhasivam@...aro.org, thierry.reding@...il.com, kw@...ux.com,
 robh@...nel.org, bhelgaas@...gle.com, jonathanh@...dia.com,
 linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-tegra@...r.kernel.org
Subject: Re: [v3] PCI: tegra194: Fix debugfs directory creation when
 CONFIG_PCIEASPM is disabled

Hi,

Nitpick: PATCH is missing within the [] in the subject.


Le 07/04/2025 à 14:43, Hans Zhang a écrit :
> Previously, the debugfs directory was unconditionally created in
> tegra_pcie_config_rp() regardless of the CONFIG_PCIEASPM setting.
> This led to unnecessary directory creation when ASPM support was disabled.
> 
> Move the debugfs directory creation into init_debugfs() which is
> conditionally compiled based on CONFIG_PCIEASPM. This ensures:
> - The directory is only created when ASPM-related debugfs entries are
>    needed.
> - Proper error handling for directory creation failures.
> - Avoids cluttering debugfs with empty directories when ASPM is disabled.
> 
> Signed-off-by: Hans Zhang <18255117159@....com>
> ---
> Changes since v2:
> https://lore.kernel.org/linux-pci/20250406134355.49036-1-18255117159@163.com/
> 
> - Maintainer recommends ignoring the devm_kasprintf return value. The
>    module should still work correctly. So just a return;

Note, that I'm not a maintainer ;-)

For what it worth:

Reviewed-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>


CJ
> 
> Changes since v1:
> https://lore.kernel.org/linux-pci/20250405145459.26800-1-18255117159@163.com/
> 
> - The first version was committed incorrectly because the judgment
>    parameter in "debugfs_remove_recursive" was not noticed.
> ---
>   drivers/pci/controller/dwc/pcie-tegra194.c | 19 ++++++++++---------
>   1 file changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
> index 5103995cd6c7..bc419688527a 100644
> --- a/drivers/pci/controller/dwc/pcie-tegra194.c
> +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
> @@ -713,7 +713,16 @@ static void init_host_aspm(struct tegra_pcie_dw *pcie)
>   
>   static void init_debugfs(struct tegra_pcie_dw *pcie)
>   {
> -	debugfs_create_devm_seqfile(pcie->dev, "aspm_state_cnt", pcie->debugfs,
> +	struct device *dev = pcie->dev;
> +	char *name;
> +
> +	name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node);
> +	if (!name)
> +		return;
> +
> +	pcie->debugfs = debugfs_create_dir(name, NULL);
> +
> +	debugfs_create_devm_seqfile(dev, "aspm_state_cnt", pcie->debugfs,
>   				    aspm_state_cnt);
>   }
>   #else
> @@ -1634,7 +1643,6 @@ static void tegra_pcie_deinit_controller(struct tegra_pcie_dw *pcie)
>   static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie)
>   {
>   	struct device *dev = pcie->dev;
> -	char *name;
>   	int ret;
>   
>   	pm_runtime_enable(dev);
> @@ -1664,13 +1672,6 @@ static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie)
>   		goto fail_host_init;
>   	}
>   
> -	name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node);
> -	if (!name) {
> -		ret = -ENOMEM;
> -		goto fail_host_init;
> -	}
> -
> -	pcie->debugfs = debugfs_create_dir(name, NULL);
>   	init_debugfs(pcie);
>   
>   	return ret;
> 
> base-commit: a8662bcd2ff152bfbc751cab20f33053d74d0963