linux-kernel - Re: [PATCH v6 02/10] Revert "drm/qxl: do not run release if qxl failed to init"

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Date:   Thu, 4 Feb 2021 19:34:30 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org
Cc:     David Airlie <airlied@...ux.ie>, Tong Zhang <ztong0001@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DRM DRIVER FOR QXL VIRTUAL GPU" 
        <virtualization@...ts.linux-foundation.org>,
        "open list:DRM DRIVER FOR QXL VIRTUAL GPU" 
        <spice-devel@...ts.freedesktop.org>,
        Dave Airlie <airlied@...hat.com>
Subject: Re: [PATCH v6 02/10] Revert "drm/qxl: do not run release if qxl
 failed to init"

Hi

Am 04.02.21 um 15:57 schrieb Gerd Hoffmann:
> This reverts commit b91907a6241193465ca92e357adf16822242296d.

This should be in the correct format, as given by 'dim cite'.

  dim cite b91907a6241193465ca92e357adf16822242296d
b91907a62411 ("drm/qxl: do not run release if qxl failed to init")

> 
> Patch is broken, it effectively makes qxl_drm_release() a nop
> because on normal driver shutdown qxl_drm_release() is called
> *after* drm_dev_unregister().
> 
> Cc: Tong Zhang <ztong0001@...il.com>
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> ---
>   drivers/gpu/drm/qxl/qxl_drv.c | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b/drivers/gpu/drm/qxl/qxl_drv.c
> index 34c8b25b5780..fb5f6a5e81d7 100644
> --- a/drivers/gpu/drm/qxl/qxl_drv.c
> +++ b/drivers/gpu/drm/qxl/qxl_drv.c
> @@ -144,8 +144,6 @@ static void qxl_drm_release(struct drm_device *dev)
>   	 * reodering qxl_modeset_fini() + qxl_device_fini() calls is
>   	 * non-trivial though.
>   	 */
> -	if (!dev->registered)
> -		return;

I'm not sure what the original problem was, but I'm sure that this isn't 
the fix for it. If there's a problem with shutdown, the operations 
rather have to be reordered correctly.

With the citation style address:

Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

>   	qxl_modeset_fini(qdev);
>   	qxl_device_fini(qdev);
>   }
> 

-- 
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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