Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 12 Dec 2019 14:51:34 +0300
From:   Dan Carpenter <dan.carpenter@oracle.com>
To:     Chuhong Yuan <hslester96@gmail.com>
Cc:     devel@driverdev.osuosl.org,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        linux-kernel@vger.kernel.org, NXP Linux Team <linux-imx@nxp.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Steve Longerbeam <slongerbeam@gmail.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org
Subject: Re: [PATCH] media: imx7-mipi-csis: Add the missed
 v4l2_async_notifier_cleanup in remove
Message-ID: <20191212115134.GA1895@kadam>
References: <20191209085828.16183-1-hslester96@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20191209085828.16183-1-hslester96@gmail.com>
User-Agent: Mutt/1.9.4 (2018-02-28)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, Dec 09, 2019 at 04:58:28PM +0800, Chuhong Yuan wrote:
> All drivers in imx call v4l2_async_notifier_cleanup() after unregistering
> the notifier except this driver.
> This should be a miss and we need to add the call to fix it.
> 
> Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
> ---
>  drivers/staging/media/imx/imx7-mipi-csis.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
> index 99166afca071..2bfa85bb84e7 100644
> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> @@ -1105,6 +1105,7 @@ static int mipi_csis_remove(struct platform_device *pdev)
>  	mipi_csis_debugfs_exit(state);
>  	v4l2_async_unregister_subdev(&state->mipi_sd);
>  	v4l2_async_notifier_unregister(&state->subdev_notifier);
> +	v4l2_async_notifier_cleanup(&state->subdev_notifier);
>  

In this case the "state->subdev_notifier" was never initialized or used
so both v4l2_async_notifier_unregister() and v4l2_async_notifier_cleanup()
are no-ops.

We should just delete "subdev_notifier".

regards,
dan carpenter