linux-kernel - Re: [PATCH] fbdev: da8xx-fb: go to proper label on error handling paths in probe

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Date:   Fri, 10 Jul 2020 16:24:00 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Evgeny Novikov <novikov@...ras.ru>
Cc:     Sekhar Nori <nsekhar@...com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Jani Nikula <jani.nikula@...el.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH] fbdev: da8xx-fb: go to proper label on error handling
 paths in probe


On 7/2/20 6:05 PM, Evgeny Novikov wrote:
> fb_probe() can successfully allocate a new frame buffer, but then fail
> to perform some operations with regulator. In these cases fb_probe()
> goes to label err_pm_runtime_disable where the frame buffer is not
> released. The patch makes fb_probe() to go to label err_release_fb on
> corresponding error handling paths.
> 
> Found by Linux Driver Verification project (linuxtesting.org).
> 
> Signed-off-by: Evgeny Novikov <novikov@...ras.ru>

Applied to drm-misc-next tree, thanks.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> ---
>  drivers/video/fbdev/da8xx-fb.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/video/fbdev/da8xx-fb.c b/drivers/video/fbdev/da8xx-fb.c
> index 73c3c4c8cc12..e38c0e3f9c61 100644
> --- a/drivers/video/fbdev/da8xx-fb.c
> +++ b/drivers/video/fbdev/da8xx-fb.c
> @@ -1402,14 +1402,14 @@ static int fb_probe(struct platform_device *device)
>  	if (IS_ERR(par->lcd_supply)) {
>  		if (PTR_ERR(par->lcd_supply) == -EPROBE_DEFER) {
>  			ret = -EPROBE_DEFER;
> -			goto err_pm_runtime_disable;
> +			goto err_release_fb;
>  		}
>  
>  		par->lcd_supply = NULL;
>  	} else {
>  		ret = regulator_enable(par->lcd_supply);
>  		if (ret)
> -			goto err_pm_runtime_disable;
> +			goto err_release_fb;
>  	}
>  
>  	fb_videomode_to_var(&da8xx_fb_var, lcdc_info);
>