linux-kernel - Re: [PATCH] PCI: mvebu: Use devm_add_action_or

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Message-ID: <20250724164217.GA2942464@bhelgaas>
Date: Thu, 24 Jul 2025 11:42:17 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Salah Triki <salah.triki@...il.com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Pali Rohár <pali@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: mvebu: Use devm_add_action_or_reset()

On Sat, Jul 19, 2025 at 05:34:40AM +0100, Salah Triki wrote:
> Replace devm_add_action() with devm_add_action_or_reset() to make code
> cleaner.
> 
> Signed-off-by: Salah Triki <salah.triki@...il.com>
> ---
>  drivers/pci/controller/pci-mvebu.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
> index a4a2bac4f4b2..755651f33811 100644
> --- a/drivers/pci/controller/pci-mvebu.c
> +++ b/drivers/pci/controller/pci-mvebu.c
> @@ -1353,11 +1353,9 @@ static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie,
>  		goto skip;
>  	}
>  
> -	ret = devm_add_action(dev, mvebu_pcie_port_clk_put, port);
> -	if (ret < 0) {
> -		clk_put(port->clk);
> +	ret = devm_add_action_or_reset(dev, mvebu_pcie_port_clk_put, port);
> +	if (ret < 0)
>  		goto err;
> -	}

Looks OK to me (and already applied, so no action necessary).

But this is the only use of mvebu_pcie_port_clk_put(), which only does
the clk_put(), so I think we could also remove
mvebu_pcie_port_clk_put() completely and simply do this:

  port->clk = of_clk_get_by_name(child, NULL);
  ...

  ret = devm_add_action_or_reset(dev, clk_put, port->clk)

which would arguably make this more readable because clk_put()
corresponds with of_clk_get_by_name(), and it's clear that port->clk
is the target.

Also, and unrelated, the "err:" label only does a return, so I think
this function would be improved by removing the "err:" label and
replacing all the "goto err" cases with "return -ENOMEM" or whatever.

Bjorn