linux-kernel - Re: [PATCH 3/3] clk: mediatek: clk-mt8173-apmixedsys: Fix iomap not released issue

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Message-ID: <20230616085104.mjlt63e24ebzslsz@blmsp>
Date:   Fri, 16 Jun 2023 10:51:04 +0200
From:   Markus Schneider-Pargmann <msp@...libre.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     sboyd@...nel.org, mturquette@...libre.com, matthias.bgg@...il.com,
        wenst@...omium.org, u.kleine-koenig@...gutronix.de,
        miles.chen@...iatek.com, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH 3/3] clk: mediatek: clk-mt8173-apmixedsys: Fix iomap not
 released issue

Hi Angelo,

On Thu, Jun 15, 2023 at 02:20:51PM +0200, AngeloGioacchino Del Regno wrote:
> In case of error after of_ioremap() the resource must be released:
> call iounmap() where appropriate to fix that.
> 
> Fixes: 41138fbf876c ("clk: mediatek: mt8173: Migrate to platform driver and common probe")
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  drivers/clk/mediatek/clk-mt8173-apmixedsys.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/mediatek/clk-mt8173-apmixedsys.c b/drivers/clk/mediatek/clk-mt8173-apmixedsys.c
> index ba1386e70a24..1bbb21ab1786 100644
> --- a/drivers/clk/mediatek/clk-mt8173-apmixedsys.c
> +++ b/drivers/clk/mediatek/clk-mt8173-apmixedsys.c
> @@ -151,8 +151,10 @@ static int clk_mt8173_apmixed_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	clk_data = mtk_alloc_clk_data(CLK_APMIXED_NR_CLK);
> -	if (IS_ERR_OR_NULL(clk_data))
> +	if (IS_ERR_OR_NULL(clk_data)) {
> +		iounmap(base);
>  		return -ENOMEM;

More of a nitpick, but I would prefer if you would use the same error
catching style as the rest of the probe function:

		if (IS_ERR_OR_NULL(clk_data)) {
			r = -ENOMEM;
			goto unmap_io;
		}
	...
	unmap_io:
		iounmap(base)
		return r;


Best,
Markus