linux-kernel - Re: [PATCH] counter: Stop using dev_get

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Message-ID: <20220218074751.3xjsxwy7s63jshwv@pengutronix.de>
Date:   Fri, 18 Feb 2022 08:47:51 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     William Breathitt Gray <vilhelm.gray@...il.com>
Cc:     linux-iio@...r.kernel.org,
        Robin van der Gracht <robin@...tonic.nl>,
        linux-kernel@...r.kernel.org,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        David Jander <david@...tonic.nl>,
        Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH] counter: Stop using dev_get_drvdata() to get the counter
 device

Hello,

On Fri, Feb 18, 2022 at 08:42:51AM +0900, William Breathitt Gray wrote:
> On Thu, Feb 17, 2022 at 05:03:08PM +0100, Uwe Kleine-König wrote:
> > On Thu, Feb 17, 2022 at 04:48:50PM +0200, Jarkko Nikula wrote:
> > > On 2/8/22 03:42, William Breathitt Gray wrote:
> > > > On Fri, Feb 04, 2022 at 09:25:56AM +0100, Uwe Kleine-König wrote:
> > > > > dev_get_drvdata() returns NULL since commit b56346ddbd82 ("counter: Use
> > > > > container_of instead of drvdata to track counter_device") which wrongly
> > > > > claimed there were no users of drvdata. Convert to container_of() to
> > > > > fix a null pointer dereference.
> > > > > 
> > > > > Reported-by: Oleksij Rempel <o.rempel@...gutronix.de>
> > > > > Fixes: b56346ddbd82 ("counter: Use container_of instead of drvdata to track counter_device")
> > > > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> > > > 
> > > > I'll pick this up and apply it to my tree.
> > >
> > > Perhaps late but I hit this same issue, patch here fixes it and I wanted to
> > > confirm it.
> > > 
> > > Tested-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
> > 
> > I wonder if this patch is scheduled for 5.17. Currently it's not even in
> > next ... :-\
> 
> I've got it in my tree. I'm sending a pull request for the Counter
> patches for 5.17 next week, so they should all be merged after that.

That's good. Still I think you could make live easier for your users to
find fixes if your tree was included in next. And in MAINTAINERS.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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