linux-kernel - Re: [PATCH 2/2] drm/exynos: Fix double locks at PM resume

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Message-id: <536C96CA.6000102@samsung.com>
Date:	Fri, 09 May 2014 17:50:18 +0900
From:	Inki Dae <inki.dae@...sung.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	David Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 2/2] drm/exynos: Fix double locks at PM resume

Hi,

On 2014년 05월 09일 15:14, Takashi Iwai wrote:
> The recent commit [3ea87855: drm/helper: lock all around force mode
> restore] introduced drm_modeset_lock_all() in
> drm_helper_resume_force_mode() itself, while exynos driver takes this
> lock before calling it.  Move the function call outside the lock for
> avoiding a deadlock.
> 
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> ---
>  drivers/gpu/drm/exynos/exynos_drm_drv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> index 2d27ba23a6a8..79410b0c4bbf 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> @@ -183,9 +183,9 @@ static int exynos_drm_resume(struct drm_device *dev)
>  		if (connector->funcs->dpms)
>  			connector->funcs->dpms(connector, connector->dpms);
>  	}
> +	drm_modeset_unlock_all(dev);
>  
>  	drm_helper_resume_force_mode(dev);
> -	drm_modeset_unlock_all(dev);

This patch had already been posted but your patch comments what was the
problem more exactly than below one.
        http://www.spinics.net/lists/dri-devel/msg58586.html

So picked it up instead of previous one.

Thanks,
Inki Dae

>  
>  	return 0;
>  }
> 

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