linux-kernel - Re: [PATCH 3.16 35/99] pxa168fb: Fix the function used to release some memory in an error handling path

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Date:   Thu, 21 May 2020 16:09:33 +0200
From:   Marion & Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Ben Hutchings <ben@...adent.org.uk>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Cc:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        YueHaibing <yuehaibing@...wei.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Lubomir Rintel <lkundrak@...sk>
Subject: Re: [PATCH 3.16 35/99] pxa168fb: Fix the function used to release
 some memory in an error handling path

Hi,

I don't think that this one is applicable to 3.16.x

The remove function and the error handling path of the probe function 
both use 'dma_free_wc'.
I've not look in details, but it looks consistent and the patch would 
not apply as-is anyway.

just my 2c.

CJ

Le 20/05/2020 à 16:14, Ben Hutchings a écrit :
> 3.16.84-rc1 review patch.  If anyone has any objections, please let me know.
>
> ------------------
>
> From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>
> commit 3c911fe799d1c338d94b78e7182ad452c37af897 upstream.
>
> In the probe function, some resources are allocated using 'dma_alloc_wc()',
> they should be released with 'dma_free_wc()', not 'dma_free_coherent()'.
>
> We already use 'dma_free_wc()' in the remove function, but not in the
> error handling path of the probe function.
>
> Also, remove a useless 'PAGE_ALIGN()'. 'info->fix.smem_len' is already
> PAGE_ALIGNed.
>
> Fixes: 638772c7553f ("fb: add support of LCD display controller on pxa168/910 (base layer)")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Reviewed-by: Lubomir Rintel <lkundrak@...sk>
> CC: YueHaibing <yuehaibing@...wei.com>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> Link: https://patchwork.freedesktop.org/patch/msgid/20190831100024.3248-1-christophe.jaillet@wanadoo.fr
> [bwh: Backported to 3.16: Use dma_free_writecombine().]
> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> ---
>   drivers/video/fbdev/pxa168fb.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
>
> --- a/drivers/video/fbdev/pxa168fb.c
> +++ b/drivers/video/fbdev/pxa168fb.c
> @@ -772,8 +772,8 @@ failed_free_cmap:
>   failed_free_clk:
>   	clk_disable(fbi->clk);
>   failed_free_fbmem:
> -	dma_free_coherent(fbi->dev, info->fix.smem_len,
> -			info->screen_base, fbi->fb_start_dma);
> +	dma_free_writecombine(fbi->dev, info->fix.smem_len,
> +			      info->screen_base, fbi->fb_start_dma);
>   failed_free_info:
>   	kfree(info);
>   failed_put_clk:
> @@ -809,7 +809,7 @@ static int pxa168fb_remove(struct platfo
>   
>   	irq = platform_get_irq(pdev, 0);
>   
> -	dma_free_writecombine(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
> +	dma_free_writecombine(fbi->dev, info->fix.smem_len,
>   				info->screen_base, info->fix.smem_start);
>   
>   	clk_disable(fbi->clk);
>