linux-kernel - Re: [PATCH] pxa168fb: fix release function mismatch in probe failure

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Date:   Wed, 15 Jan 2020 16:51:13 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Chuhong Yuan <hslester96@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pxa168fb: fix release function mismatch in probe
 failure


On 12/5/19 5:06 PM, Chuhong Yuan wrote:
> The driver uses kfree() to release the resource allocated by
> framebuffer_alloc(), which does not match.
> Use framebuffer_release() instead to fix it.

For pxa168fb driver framebuffer_release() does only kfree() so
there is no real breakage currently. Lets fix it anyway so it
won't break in the future.

> Fixes: 638772c7553f ("fb: add support of LCD display controller on pxa168/910 (base layer)")
> Signed-off-by: Chuhong Yuan <hslester96@...il.com>

Patch queued for v5.6, thanks.
 
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> ---
>  drivers/video/fbdev/pxa168fb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/video/fbdev/pxa168fb.c b/drivers/video/fbdev/pxa168fb.c
> index 1410f476e135..b9435133b6f3 100644
> --- a/drivers/video/fbdev/pxa168fb.c
> +++ b/drivers/video/fbdev/pxa168fb.c
> @@ -769,7 +769,7 @@ static int pxa168fb_probe(struct platform_device *pdev)
>  	dma_free_coherent(fbi->dev, info->fix.smem_len,
>  			info->screen_base, fbi->fb_start_dma);
>  failed_free_info:
> -	kfree(info);
> +	framebuffer_release(info);
>  
>  	dev_err(&pdev->dev, "frame buffer device init failed with %d\n", ret);
>  	return ret;
>