linux-kernel - Re: Re: [PATCH] drm: bridge: adv7511: Add check for mipi_dsi_driver

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Date:   Wed, 1 Jun 2022 12:15:37 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     andrzej.hajda@...el.com, narmstrong@...libre.com,
        robert.foss@...aro.org, jonas@...boo.se, jernej.skrabec@...il.com,
        airlied@...ux.ie, daniel@...ll.ch, maxime@...no.tech,
        sam@...nborg.org, alsi@...g-olufsen.dk, jagan@...rulasolutions.com,
        biju.das.jz@...renesas.com, l.stach@...gutronix.de,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH] drm: bridge: adv7511: Add check for
 mipi_dsi_driver_register

On Wed, Jun 01, 2022 at 04:45:01PM +0800, Jiasheng Jiang wrote:
> On Wed, Jun 01, 2022 at 02:52:00PM +0800, Laurent Pinchart wrote:
> >>  static int __init adv7511_init(void)
> >>  {
> >> -	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
> >> -		mipi_dsi_driver_register(&adv7533_dsi_driver);
> >> +	int ret;
> >> +
> >> +	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI)) {
> >> +		ret = mipi_dsi_driver_register(&adv7533_dsi_driver);
> >> +		if (ret)
> >> +			return ret;
> >> +	}
> >>  
> >>  	return i2c_add_driver(&adv7511_driver);
> > 
> > While at it, should this then call mipi_dsi_driver_unregister() on
> > failure ?
> 
> Well, as far as I am concerned, the adv7511_exit() in the same file has already dealt with the issue.
> Therefore, it might not be necessary to add another mipi_dsi_driver_unregister().

The issue is that adv7511_exit() is not called if adv7511_init() fails.

-- 
Regards,

Laurent Pinchart