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Message-ID: <50977f1c8f17cbc1e3ac4f68d6642f1c3bd01b79.camel@pengutronix.de>
Subject: Re: [PATCH] media: imx7-mipi-csis: Add the missed
 v4l2_async_notifier_cleanup in remove
From:   Philipp Zabel <p.zabel@pengutronix.de>
To:     Dan Carpenter <dan.carpenter@oracle.com>,
        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>,
        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
Date:   Thu, 12 Dec 2019 12:59:55 +0100
In-Reply-To: <20191212115134.GA1895@kadam>
References: <20191209085828.16183-1-hslester96@gmail.com>
         <20191212115134.GA1895@kadam>
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On Thu, 2019-12-12 at 14:51 +0300, Dan Carpenter wrote:
> 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".

I agree with Dan and Hans, the subdev_notifier field and the
v4l2_async_notifier_unregister() call should be removed. Since
this issue was there from the start, the patch can be tagged
as fixing commit 7807063b862b.

regards
Philipp