linux-kernel - Re: [PATCH v2] serial: mxs-auart: add missed iounmap() in probe failure and remove

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Date:   Tue, 14 Jul 2020 13:29:11 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Chuhong Yuan <hslester96@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] serial: mxs-auart: add missed iounmap() in probe
 failure and remove

On 09. 07. 20, 15:56, Chuhong Yuan wrote:
> This driver calls ioremap() in probe, but it misses calling iounmap() in 
> probe's error handler and remove.
> Add the missed calls to fix it.
> 
> Fixes: 47d37d6f94cc ("serial: Add auart driver for i.MX23/28")
> Signed-off-by: Chuhong Yuan <hslester96@...il.com>
> ---
> Changes in v2:
>   - Use iounmap() instead of devm_ioremap() to fix the bugs.

Out of curiosity, what was wrong with devm_ioremap? I seem I cannot find
the reason...

>   - Modify the subject and the description.
> 
>  drivers/tty/serial/mxs-auart.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
> index b4f835e7de23..b784323a6a7b 100644
> --- a/drivers/tty/serial/mxs-auart.c
> +++ b/drivers/tty/serial/mxs-auart.c
> @@ -1698,21 +1698,21 @@ static int mxs_auart_probe(struct platform_device *pdev)
>  	irq = platform_get_irq(pdev, 0);
>  	if (irq < 0) {
>  		ret = irq;
> -		goto out_disable_clks;
> +		goto out_iounmap;
>  	}
>  
>  	s->port.irq = irq;
>  	ret = devm_request_irq(&pdev->dev, irq, mxs_auart_irq_handle, 0,
>  			       dev_name(&pdev->dev), s);
>  	if (ret)
> -		goto out_disable_clks;
> +		goto out_iounmap;
>  
>  	platform_set_drvdata(pdev, s);
>  
>  	ret = mxs_auart_init_gpios(s, &pdev->dev);
>  	if (ret) {
>  		dev_err(&pdev->dev, "Failed to initialize GPIOs.\n");
> -		goto out_disable_clks;
> +		goto out_iounmap;
>  	}
>  
>  	/*
> @@ -1720,7 +1720,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
>  	 */
>  	ret = mxs_auart_request_gpio_irq(s);
>  	if (ret)
> -		goto out_disable_clks;
> +		goto out_iounmap;
>  
>  	auart_port[s->port.line] = s;
>  
> @@ -1746,6 +1746,9 @@ static int mxs_auart_probe(struct platform_device *pdev)
>  	mxs_auart_free_gpio_irq(s);
>  	auart_port[pdev->id] = NULL;
>  
> +out_iounmap:
> +	iounmap(s->port.membase);
> +
>  out_disable_clks:
>  	if (is_asm9260_auart(s)) {
>  		clk_disable_unprepare(s->clk);
> @@ -1761,6 +1764,7 @@ static int mxs_auart_remove(struct platform_device *pdev)
>  	uart_remove_one_port(&auart_driver, &s->port);
>  	auart_port[pdev->id] = NULL;
>  	mxs_auart_free_gpio_irq(s);
> +	iounmap(s->port.membase);
>  	if (is_asm9260_auart(s)) {
>  		clk_disable_unprepare(s->clk);
>  		clk_disable_unprepare(s->clk_ahb);
> 


-- 
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