linux-kernel - Re: [PATCH] PCI: apple: do not leak reset GPIO on unbind/unload/error

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Date:   Tue, 6 Sep 2022 16:13:56 +0900
From:   Hector Martin <marcan@...can.st>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Marc Zyngier <maz@...nel.org>
Cc:     Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Sven Peter <sven@...npeter.dev>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: apple: do not leak reset GPIO on unbind/unload/error

On 06/09/2022 11.15, Dmitry Torokhov wrote:
> The driver allocates reset GPIO in apple_pcie_setup_port() but neither
> releases the resource, nor uses devm API to have it released
> automatically.
> 
> Let's fix this by switching to devm API. While at it let's use generic
> devm_fwnode_gpiod_get() instead of OF-specific gpiod_get_from_of_node()
> - this will allow us top stop exporting the latter down the road.
> 
> Fixes: 1e33888fbe44 ("PCI: apple: Add initial hardware bring-up")
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
> 
> This patch has been pulled out of the series
> https://lore.kernel.org/all/20220903-gpiod_get_from_of_node-remove-v1-0-b29adfb27a6c@gmail.com/
> with updated justification (leak fix vs pure API deprecation).
> 
>  drivers/pci/controller/pcie-apple.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c
> index a2c3c207a04b..66f37e403a09 100644
> --- a/drivers/pci/controller/pcie-apple.c
> +++ b/drivers/pci/controller/pcie-apple.c
> @@ -516,8 +516,8 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie,
>  	u32 stat, idx;
>  	int ret, i;
>  
> -	reset = gpiod_get_from_of_node(np, "reset-gpios", 0,
> -				       GPIOD_OUT_LOW, "PERST#");
> +	reset = devm_fwnode_gpiod_get(pcie->dev, of_fwnode_handle(np), "reset",
> +				      GPIOD_OUT_LOW, "PERST#");
>  	if (IS_ERR(reset))
>  		return PTR_ERR(reset);
>  

Reviewed-by: Hector Martin <marcan@...can.st>

I actually caught this one a while back, just didn't get around to
submitting it yet since it's part of my WIP PCIe power management branch
(that I'm getting back to next week or so!) :)

https://github.com/AsahiLinux/linux/commit/04f5628fc73ea0369f66c83ba473cb6f8187d2b3

- Hector