linux-kernel - Re: [PATCH] serial: st-asc: Fix to check return value of platform_get_irq() in asc_init

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Message-ID: <2023073028-pantyhose-replace-b960@gregkh>
Date:   Sun, 30 Jul 2023 13:54:36 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Zhang Shurong <zhang_shurong@...mail.com>
Cc:     patrice.chotard@...s.st.com, jirislaby@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: st-asc: Fix to check return value of
 platform_get_irq() in asc_init_port()

On Sun, Jul 23, 2023 at 12:28:47PM +0800, Zhang Shurong wrote:
> The platform_get_irq might be failed and return a negative result. So
> there should have an error handling code.
> 
> Fixed this by adding an error handling code.
> 
> Fixes: c4b058560762 ("serial:st-asc: Add ST ASC driver.")
> Signed-off-by: Zhang Shurong <zhang_shurong@...mail.com>
> ---
>  drivers/tty/serial/st-asc.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
> index aa471c9c24d9..2f1807fa9bdb 100644
> --- a/drivers/tty/serial/st-asc.c
> +++ b/drivers/tty/serial/st-asc.c
> @@ -688,9 +688,13 @@ static int asc_init_port(struct asc_port *ascport,
>  	port->ops	= &asc_uart_ops;
>  	port->fifosize	= ASC_FIFO_SIZE;
>  	port->dev	= &pdev->dev;
> -	port->irq	= platform_get_irq(pdev, 0);
>  	port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_ST_ASC_CONSOLE);
>  
> +	ret = platform_get_irq(pdev, 0);
> +	if (ret < 0)
> +		return ret;
> +	port->irq = ret;
> +
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	port->membase = devm_ioremap_resource(&pdev->dev, res);
>  	if (IS_ERR(port->membase))
> -- 
> 2.41.0
> 

Does not apply to my tty-next tree :(