linux-kernel - Re: [PATCH] drm/hisilicon: Use drmm_kzalloc() instead of devm

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Date:   Thu, 2 Jul 2020 16:07:25 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Tian Tao <tiantao6@...ilicon.com>, puck.chen@...ilicon.com,
        airlied@...ux.ie, kraxel@...hat.com, alexander.deucher@....com,
        tglx@...utronix.de, dri-devel@...ts.freedesktop.org,
        xinliang.liu@...aro.org, linux-kernel@...r.kernel.org,
        inuxarm@...wei.com
Subject: Re: [PATCH] drm/hisilicon: Use drmm_kzalloc() instead of
 devm_kzalloc()

Hi Daniel

Am 02.07.20 um 15:16 schrieb Daniel Vetter:
> On Thu, Jul 02, 2020 at 09:21:54AM +0800, Tian Tao wrote:
>> using the new API drmm_kzalloc() instead of devm_kzalloc()
>>
>> Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
>> ---
>>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
>> index a6fd0c2..2f20704 100644
>> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
>> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
>> @@ -23,6 +23,7 @@
>>  #include <drm/drm_print.h>
>>  #include <drm/drm_probe_helper.h>
>>  #include <drm/drm_vblank.h>
>> +#include <drm/drm_managed.h>
>>  
>>  #include "hibmc_drm_drv.h"
>>  #include "hibmc_drm_regs.h"
>> @@ -267,7 +268,7 @@ static int hibmc_load(struct drm_device *dev)
>>  	struct hibmc_drm_private *priv;
>>  	int ret;
>>  
>> -	priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL);
>> +	priv = drmm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> 
> Hm would be nice if hisilicon could entirely switch over to embedding, and
> stop using the driver private pointer. Quite a bit more work though. As-is
> this change here isn't really brining you closer to that, pretty much all
> the lifetime bugs around hotunload are still there.

Well, it's a first step. The follow-up patch for embedding connector and
encoder removes more instances of devm_kzalloc().

Although I have to say, I'd rather review a longer patch series that
fully addresses the problem, instead the current one-by-one approach.

Best regards
Thomas

> -Daniel
> 
>>  	if (!priv) {
>>  		DRM_ERROR("no memory to allocate for hibmc_drm_private\n");
>>  		return -ENOMEM;
>> -- 
>> 2.7.4
>>
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer



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