linux-kernel - Re: [PATCH v6 01/10] [hack] silence ttm fini WARNING

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Date:   Thu, 4 Feb 2021 15:58:33 +0100
From:   Christian König <christian.koenig@....com>
To:     Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org
Cc:     Huang Rui <ray.huang@....com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 01/10] [hack] silence ttm fini WARNING

?

What's the background here?

Christian.

Am 04.02.21 um 15:57 schrieb Gerd Hoffmann:
> kobject: '(null)' ((____ptrval____)): is not initialized, yet kobject_put() is being called.
> WARNING: CPU: 0 PID: 209 at lib/kobject.c:750 kobject_put+0x3a/0x60
> [ ... ]
> Call Trace:
>   ttm_device_fini+0x133/0x1b0 [ttm]
>   qxl_ttm_fini+0x2f/0x40 [qxl]
> ---
>   drivers/gpu/drm/ttm/ttm_device.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
> index ac0903c9e60a..b638cbb0bd45 100644
> --- a/drivers/gpu/drm/ttm/ttm_device.c
> +++ b/drivers/gpu/drm/ttm/ttm_device.c
> @@ -50,7 +50,7 @@ static void ttm_global_release(void)
>   		goto out;
>   
>   	kobject_del(&glob->kobj);
> -	kobject_put(&glob->kobj);
> +//	kobject_put(&glob->kobj);
>   	ttm_mem_global_release(&ttm_mem_glob);
>   	__free_page(glob->dummy_read_page);
>   	memset(glob, 0, sizeof(*glob));