Re: [PATCH] drm: Restore GNOME monitors.xml support

[Jani Nikula <jani.nikula@linux.intel.com>]

On Sun, 04 Jun 2017, "H.J. Lu" <hjl.tools@gmail.com> wrote:
> Please CC me since I am not on this mailing list.

Sorry, should've instructed you to send to dri-devel instead of
intel-gfx, because the patch touches drm helpers. Cc'd.

BR,
Jani.

>
> H.J.
> ---
> My ~/.config/monitors.xml swaps primary/secondary displays as well as
> their horizontal positions.  It works fine until:
>
> commit 91eefc05f0ac71902906b2058360e61bd25137fe
> Author: Daniel Vetter <daniel.vetter@ffwll.ch>
> Date:   Wed Dec 14 00:08:10 2016 +0100
>
>     drm: Tighten locking in drm_mode_getconnector
>
> which makes ~/.config/monitors.xml not effective.  This patch reorders
> drm_mode_getconnector and restores monitors.xml support.
>
> This may also fix:
>
> https://bugs.freedesktop.org/show_bug.cgi?id=100576
>
> Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
> ---
>  drivers/gpu/drm/drm_connector.c | 74 ++++++++++++++++++++---------------------
>  1 file changed, 37 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 45464c8..4fe8ff3 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -1169,41 +1169,6 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
>  	if (!connector)
>  		return -ENOENT;
>  
> -	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
> -	encoder = drm_connector_get_encoder(connector);
> -	if (encoder)
> -		out_resp->encoder_id = encoder->base.id;
> -	else
> -		out_resp->encoder_id = 0;
> -
> -	ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic,
> -			(uint32_t __user *)(unsigned long)(out_resp->props_ptr),
> -			(uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr),
> -			&out_resp->count_props);
> -	drm_modeset_unlock(&dev->mode_config.connection_mutex);
> -	if (ret)
> -		goto out_unref;
> -
> -	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
> -		if (connector->encoder_ids[i] != 0)
> -			encoders_count++;
> -
> -	if ((out_resp->count_encoders >= encoders_count) && encoders_count) {
> -		copied = 0;
> -		encoder_ptr = (uint32_t __user *)(unsigned long)(out_resp->encoders_ptr);
> -		for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
> -			if (connector->encoder_ids[i] != 0) {
> -				if (put_user(connector->encoder_ids[i],
> -					     encoder_ptr + copied)) {
> -					ret = -EFAULT;
> -					goto out_unref;
> -				}
> -				copied++;
> -			}
> -		}
> -	}
> -	out_resp->count_encoders = encoders_count;
> -
>  	out_resp->connector_id = connector->base.id;
>  	out_resp->connector_type = connector->connector_type;
>  	out_resp->connector_type_id = connector->connector_type_id;
> @@ -1240,15 +1205,50 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
>  			if (copy_to_user(mode_ptr + copied,
>  					 &u_mode, sizeof(u_mode))) {
>  				ret = -EFAULT;
> +				mutex_unlock(&dev->mode_config.mutex);
>  				goto out;
>  			}
>  			copied++;
>  		}
>  	}
>  	out_resp->count_modes = mode_count;
> -out:
>  	mutex_unlock(&dev->mode_config.mutex);
> -out_unref:
> +
> +	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
> +	encoder = drm_connector_get_encoder(connector);
> +	if (encoder)
> +		out_resp->encoder_id = encoder->base.id;
> +	else
> +		out_resp->encoder_id = 0;
> +
> +	ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic,
> +			(uint32_t __user *)(unsigned long)(out_resp->props_ptr),
> +			(uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr),
> +			&out_resp->count_props);
> +	drm_modeset_unlock(&dev->mode_config.connection_mutex);
> +	if (ret)
> +		goto out;
> +
> +	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
> +		if (connector->encoder_ids[i] != 0)
> +			encoders_count++;
> +
> +	if ((out_resp->count_encoders >= encoders_count) && encoders_count) {
> +		copied = 0;
> +		encoder_ptr = (uint32_t __user *)(unsigned long)(out_resp->encoders_ptr);
> +		for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
> +			if (connector->encoder_ids[i] != 0) {
> +				if (put_user(connector->encoder_ids[i],
> +					     encoder_ptr + copied)) {
> +					ret = -EFAULT;
> +					goto out;
> +				}
> +				copied++;
> +			}
> +		}
> +	}
> +	out_resp->count_encoders = encoders_count;
> +out:
>  	drm_connector_unreference(connector);
>  
>  	return ret;

-- 
Jani Nikula, Intel Open Source Technology Center
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