linux-kernel - Re: [PATCH] can: m_can: m_can_close(): don't call free

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Message-ID: <agcndznzxzme552ftebopyu326el4aikq5n6azj3rf4nijxbda@crv5zxjxbdek>
Date: Tue, 1 Oct 2024 14:48:46 +0200
From: Markus Schneider-Pargmann <msp@...libre.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>
Cc: Chandrasekar Ramakrishnan <rcsekar@...sung.com>, 
	Vincent Mailhol <mailhol.vincent@...adoo.fr>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Tony Lindgren <tony@...mide.com>, Judith Mendez <jm@...com>, 
	linux-can@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	kernel@...gutronix.de
Subject: Re: [PATCH] can: m_can: m_can_close(): don't call free_irq() for
 IRQ-less devices

On Mon, Sep 30, 2024 at 07:45:57PM GMT, Marc Kleine-Budde wrote:
> In commit b382380c0d2d ("can: m_can: Add hrtimer to generate software
> interrupt") support for IRQ-less devices was added. Instead of an
> interrupt, the interrupt routine is called by a hrtimer-based polling
> loop.
> 
> That patch forgot to change free_irq() to be only called for devices
> with IRQs. Fix this, by calling free_irq() conditionally only if an
> IRQ is available for the device (and thus has been requested
> previously).
> 
> Fixes: b382380c0d2d ("can: m_can: Add hrtimer to generate software interrupt")
> Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>

Reviewed-by: Markus Schneider-Pargmann <msp@...libre.com>

Best
Markus

> ---
>  drivers/net/can/m_can/m_can.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
> index a978b960f1f1e1e8273216ff330ab789d0fd6d51..16e9e7d7527d9762d73a7ec47940c73c0976e05d 100644
> --- a/drivers/net/can/m_can/m_can.c
> +++ b/drivers/net/can/m_can/m_can.c
> @@ -1765,7 +1765,8 @@ static int m_can_close(struct net_device *dev)
>  	netif_stop_queue(dev);
>  
>  	m_can_stop(dev);
> -	free_irq(dev->irq, dev);
> +	if (dev->irq)
> +		free_irq(dev->irq, dev);
>  
>  	m_can_clean(dev);
>  
> 
> ---
> base-commit: d505d3593b52b6c43507f119572409087416ba28
> change-id: 20240930-m_can-cleanups-53ce4276f1b1
> 
> Best regards,
> -- 
> Marc Kleine-Budde <mkl@...gutronix.de>
> 
> 

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