linux-kernel - Re: [PATCH] Staging: nvec: Fix pm_power_off reset condition in tegra_nvec

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Message-ID: <2025021048-mop-punctual-1fed@gregkh>
Date: Mon, 10 Feb 2025 07:10:00 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Dima Volkovsk <s0ldw3ll@...il.com>
Cc: marvin24@....de, ac100@...ts.launchpad.net, linux-tegra@...r.kernel.org,
	linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Staging: nvec: Fix pm_power_off reset condition in
 tegra_nvec_remove

On Sun, Feb 09, 2025 at 09:16:48PM +0100, Dima Volkovsk wrote:
> In the current implementation of tegra_nvec_remove, the pm_power_off handler
> is set to NULL without checking if it is actually set to nvec_power_off. This
> change ensures that pm_power_off is only reset if it was previously set to
> nvec_power_off, preventing unintended side effects when removing the device.
> 
> Signed-off-by: Dima Volkovsk <s0ldw3ll@...il.com>
> ---
>  drivers/staging/nvec/nvec.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
> index 263774e6a78c..9057f061e927 100644
> --- a/drivers/staging/nvec/nvec.c
> +++ b/drivers/staging/nvec/nvec.c
> @@ -903,8 +903,10 @@ static void tegra_nvec_remove(struct platform_device *pdev)
>  	nvec_unregister_notifier(nvec, &nvec->nvec_status_notifier);
>  	cancel_work_sync(&nvec->rx_work);
>  	cancel_work_sync(&nvec->tx_work);
> -	/* FIXME: needs check whether nvec is responsible for power off */
> -	pm_power_off = NULL;
> +
> +	/* only reset pm_power_off if it's our handler */
> +	if (pm_power_off = nvec_power_off)

I don't think you tested this :(