Re: [PATCH 44/51] drm/gm12u320: Use helpers for shutdown/suspend/resume

From: Hans de Goede <hdegoede@redhat.com>
To: Daniel Vetter <daniel.vetter@ffwll.ch>,
	DRI Development <dri-devel@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@intel.com>,
	Intel Graphics Development <intel-gfx@lists.freedesktop.org>
Subject: Re: [PATCH 44/51] drm/gm12u320: Use helpers for shutdown/suspend/resume
Date: Sat, 22 Feb 2020 13:10:50 +0100	[thread overview]
Message-ID: <34b74386-ae1c-8074-3afd-d8ce2bd5fcb8@redhat.com> (raw)
In-Reply-To: <20200221210319.2245170-45-daniel.vetter@ffwll.ch>

Hi,

On 2/21/20 10:03 PM, Daniel Vetter wrote:
> Also there's a race in the disconnect implemenation. First shut
> down, then unplug, leaves a window where userspace could sneak
> in and restart the entire machinery.
> 
> With this we can also delete the very un-atomic global pipe_enabled
> tracking.

Patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@redhat.com>

Regards,

Hans

> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: "Noralf Trønnes" <noralf@tronnes.org>
> ---
>   drivers/gpu/drm/tiny/gm12u320.c | 16 +++-------------
>   1 file changed, 3 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/tiny/gm12u320.c b/drivers/gpu/drm/tiny/gm12u320.c
> index 65dfb87ccb13..c22b2ee470eb 100644
> --- a/drivers/gpu/drm/tiny/gm12u320.c
> +++ b/drivers/gpu/drm/tiny/gm12u320.c
> @@ -88,7 +88,6 @@ struct gm12u320_device {
>   	struct usb_device               *udev;
>   	unsigned char                   *cmd_buf;
>   	unsigned char                   *data_buf[GM12U320_BLOCK_COUNT];
> -	bool                             pipe_enabled;
>   	struct {
>   		bool                     run;
>   		struct workqueue_struct *workq;
> @@ -589,7 +588,6 @@ static void gm12u320_pipe_enable(struct drm_simple_display_pipe *pipe,
>   
>   	gm12u320_fb_mark_dirty(plane_state->fb, &rect);
>   	gm12u320_start_fb_update(gm12u320);
> -	gm12u320->pipe_enabled = true;
>   }
>   
>   static void gm12u320_pipe_disable(struct drm_simple_display_pipe *pipe)
> @@ -597,7 +595,6 @@ static void gm12u320_pipe_disable(struct drm_simple_display_pipe *pipe)
>   	struct gm12u320_device *gm12u320 = pipe->crtc.dev->dev_private;
>   
>   	gm12u320_stop_fb_update(gm12u320);
> -	gm12u320->pipe_enabled = false;
>   }
>   
>   static void gm12u320_pipe_update(struct drm_simple_display_pipe *pipe,
> @@ -733,22 +730,17 @@ static int gm12u320_usb_probe(struct usb_interface *interface,
>   static void gm12u320_usb_disconnect(struct usb_interface *interface)
>   {
>   	struct drm_device *dev = usb_get_intfdata(interface);
> -	struct gm12u320_device *gm12u320 = dev->dev_private;
>   
> -	gm12u320_stop_fb_update(gm12u320);
>   	drm_dev_unplug(dev);
> +	drm_atomic_helper_shutdown(dev);
>   }
>   
>   static __maybe_unused int gm12u320_suspend(struct usb_interface *interface,
>   					   pm_message_t message)
>   {
>   	struct drm_device *dev = usb_get_intfdata(interface);
> -	struct gm12u320_device *gm12u320 = dev->dev_private;
>   
> -	if (gm12u320->pipe_enabled)
> -		gm12u320_stop_fb_update(gm12u320);
> -
> -	return 0;
> +	return drm_mode_config_helper_suspend(dev);
>   }
>   
>   static __maybe_unused int gm12u320_resume(struct usb_interface *interface)
> @@ -757,10 +749,8 @@ static __maybe_unused int gm12u320_resume(struct usb_interface *interface)
>   	struct gm12u320_device *gm12u320 = dev->dev_private;
>   
>   	gm12u320_set_ecomode(gm12u320);
> -	if (gm12u320->pipe_enabled)
> -		gm12u320_start_fb_update(gm12u320);
>   
> -	return 0;
> +	return drm_mode_config_helper_resume(dev);
>   }
>   
>   static const struct usb_device_id id_table[] = {
> 

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