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

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Date:   Thu, 2 Jul 2020 15:16:17 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Tian Tao <tiantao6@...ilicon.com>
Cc:     puck.chen@...ilicon.com, airlied@...ux.ie, daniel@...ll.ch,
        tzimmermann@...e.de, 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()

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.
-Daniel

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

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch