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

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Date:   Fri, 3 Jan 2020 13:00:23 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Lubomir Rintel <lkundrak@...sk>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     yuehaibing@...wei.com, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] pxa168fb: Fix the function used to release some memory
 in an error handling path


On 9/2/19 11:10 AM, Lubomir Rintel wrote:
> On Sat, 2019-08-31 at 12:00 +0200, Christophe JAILLET wrote:
>> 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>

Thanks, patch queued for v5.6 (also sorry for the delay).

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

> Thanks,
> Lubo
> 
>> ---
>> The change about PAGE_ALIGN should probably be part of a separate commit.
>> However, git history for this driver is really quiet. If you think it
>> REALLY deserves a separate patch, either split it by yourself or axe this
>> part of the patch. I won't bother resubmitting for this lonely cleanup.
>> Hoping for your understanding.
>> ---
>>  drivers/video/fbdev/pxa168fb.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/video/fbdev/pxa168fb.c b/drivers/video/fbdev/pxa168fb.c
>> index 1410f476e135..1fc50fc0694b 100644
>> --- a/drivers/video/fbdev/pxa168fb.c
>> +++ b/drivers/video/fbdev/pxa168fb.c
>> @@ -766,8 +766,8 @@ static int pxa168fb_probe(struct platform_device *pdev)
>>  failed_free_clk:
>>  	clk_disable_unprepare(fbi->clk);
>>  failed_free_fbmem:
>> -	dma_free_coherent(fbi->dev, info->fix.smem_len,
>> -			info->screen_base, fbi->fb_start_dma);
>> +	dma_free_wc(fbi->dev, info->fix.smem_len,
>> +		    info->screen_base, fbi->fb_start_dma);
>>  failed_free_info:
>>  	kfree(info);
>>  
>> @@ -801,7 +801,7 @@ static int pxa168fb_remove(struct platform_device *pdev)
>>  
>>  	irq = platform_get_irq(pdev, 0);
>>  
>> -	dma_free_wc(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
>> +	dma_free_wc(fbi->dev, info->fix.smem_len,
>>  		    info->screen_base, info->fix.smem_start);
>>  
>>  	clk_disable_unprepare(fbi->clk);
>