linux-kernel - Re: [PATCH] firmware: psci: Fix refcount leak in psci_dt

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Message-ID: <Z9qmglbXw0xILaet@J2N7QTR9R3>
Date: Wed, 19 Mar 2025 11:12:02 +0000
From: Mark Rutland <mark.rutland@....com>
To: Sudeep Holla <sudeep.holla@....com>
Cc: Miaoqian Lin <linmq006@...il.com>, Gavin Shan <gshan@...hat.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Will Deacon <will@...nel.org>, Hanjun Guo <guohanjun@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] firmware: psci: Fix refcount leak in psci_dt_init

On Wed, Mar 19, 2025 at 10:46:49AM +0000, Sudeep Holla wrote:
> On Wed, Mar 19, 2025 at 08:28:38PM +1000, Gavin Shan wrote:

> Any reason why we can't move to the new scoped usage like below?

> diff --git i/drivers/firmware/psci/psci.c w/drivers/firmware/psci/psci.c
> index a1ebbe9b73b1..a4269078b2a2 100644
> --- i/drivers/firmware/psci/psci.c
> +++ w/drivers/firmware/psci/psci.c
> @@ -797,12 +797,11 @@ static const struct of_device_id psci_of_match[] __initconst = {
> 
>  int __init psci_dt_init(void)
>  {
> -       struct device_node *np;
>         const struct of_device_id *matched_np;
>         psci_initcall_t init_fn;
>         int ret;
> -
> -       np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
> +       struct device_node *np __free(device_node) =
> +               of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
> 
>         if (!np || !of_device_is_available(np))
>                 return -ENODEV;
> @@ -810,7 +809,6 @@ int __init psci_dt_init(void)
>         init_fn = (psci_initcall_t)matched_np->data;
>         ret = init_fn(np);
> 
> -       of_node_put(np);
>         return ret;
>  }

IIUC the bug has existed since before the scoped helpers were
introduced, so for the sake of keeping the backport simple I reckon we
should take Miaoqian Lin's patch as-is, and we can consider moving to
the scoped helpers as a later cleanup.

Mark.