linux-kernel - Re: [PATCH 1/1] drm/sun4i: hdmi: Check for null pointer before cleanup

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Date:   Tue, 17 Dec 2019 08:26:25 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Stefan Mavrodiev <stefan@...mex.com>
Cc:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:DRM DRIVERS FOR ALLWINNER A10" 
        <dri-devel@...ts.freedesktop.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH 1/1] drm/sun4i: hdmi: Check for null pointer before
 cleanup

On Mon, Dec 16, 2019 at 04:43:48PM +0200, Stefan Mavrodiev wrote:
> It's possible hdmi->connector and hdmi->encoder divices to be NULL.

The wording is broken and s/divices/devices/. I'd write:

	It's possible that the parent devices of the connector and/or
	encoder are NULL. This makes drm_connector_cleanup and
	drm_encoder_cleanup respectively trigger a NULL pointer
	exeception:

		<...log here...>

	This is reproducible by

		<...receipt here...>

	So add a check for NULL before calling these functions.

Of course this doesn't address the reservations by Maxime.

Best regards
Uwe

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