linux-kernel - RE: [EXT] [PATCH] i2c: busses: Fix a reference count leak.

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Message-ID: <AM6PR0402MB36071B3C8859FA8F694FB706FF9C0@AM6PR0402MB3607.eurprd04.prod.outlook.com>
Date:   Mon, 15 Jun 2020 02:48:33 +0000
From:   Andy Duan <fugang.duan@....com>
To:     "wu000273@....edu" <wu000273@....edu>,
        "kjlu@....edu" <kjlu@....edu>
CC:     Aisheng Dong <aisheng.dong@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>, Wolfram Sang <wsa@...nel.org>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] [PATCH] i2c: busses: Fix a reference count leak.

From: wu000273@....edu <wu000273@....edu> Sent: Sunday, June 14, 2020 6:12 AM
> From: Qiushi Wu <wu000273@....edu>
> 
> pm_runtime_get_sync() increments the runtime PM usage counter even
> when it returns an error code. Thus call pm_runtime_put_noidle() if
> pm_runtime_get_sync() fails.
> 
> Fixes: 13d6eb20fc79 ("i2c: imx-lpi2c: add runtime pm support")
> Signed-off-by: Qiushi Wu <wu000273@....edu>

Again, which case can trigger the issue ?
> ---
>  drivers/i2c/busses/i2c-imx-lpi2c.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c
> b/drivers/i2c/busses/i2c-imx-lpi2c.c
> index 9db6ccded5e9..85b9c1fc7681 100644
> --- a/drivers/i2c/busses/i2c-imx-lpi2c.c
> +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
> @@ -260,8 +260,10 @@ static int lpi2c_imx_master_enable(struct
> lpi2c_imx_struct *lpi2c_imx)
>         int ret;
> 
>         ret = pm_runtime_get_sync(lpi2c_imx->adapter.dev.parent);
> -       if (ret < 0)
> +       if (ret < 0) {
> +               pm_runtime_put_noidle(lpi2c_imx->adapter.dev.parent);
>                 return ret;
> +       }
> 
>         temp = MCR_RST;
>         writel(temp, lpi2c_imx->base + LPI2C_MCR);
> --
> 2.17.1