Re: [PATCH v4 1/2] drm/i915: Handle drm-layer errors in intel_dp_add_mst_connector

Ausmus, James
2017-10-12T19:00:07Z

On Wed, Sep 27, 2017 at 11:29 AM, James Ausmus <james.ausmus@intel.com> wrote:
> Make intel_dp_add_mst_connector handle error returns from the drm_ calls.
> Add intel_connector_free to support cleanup on the error path.
>
> v2: Rename new function to avoid confusion, and simplify error
> paths (Ville)
>
> v3: Indentation fixup, style fixes (Ville)
>
> v4: Clarify usage of intel_connector_free, and fix usage of
> intel_connector_free

Ville - any additional issues you see with the latest spin?

Thanks!

-James

>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: James Ausmus <james.ausmus@intel.com>
> ---
> drivers/gpu/drm/i915/intel_display.c | 13 +++++++++++++
> drivers/gpu/drm/i915/intel_dp_mst.c | 27 ++++++++++++++++++++++-----
> drivers/gpu/drm/i915/intel_drv.h | 1 +
> 3 files changed, 36 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index c4b224a3a0ee..725014bf6f0f 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6146,6 +6146,19 @@ struct intel_connector *intel_connector_alloc(void)
> return connector;
> }
>
> +/*
> + * Free the bits allocated by intel_connector_alloc.
> + * This should only be used after intel_connector_alloc has returned
> + * successfully, and before drm_connector_init returns successfully.
> + * Otherwise the destroy callbacks for the connector and the state should
> + * take care of proper cleanup/free
> + */
> +void intel_connector_free(struct intel_connector *connector)
> +{
> + kfree(to_intel_digital_connector_state(connector->base.state));
> + kfree(connector);
> +}
> +
> /* Simple connector->get_hw_state implementation for encoders that support only
> * one connector and no cloning and hence the encoder state determines the state
> * of the connector. */
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> index 9a396f483f8b..8ceffad3e665 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -450,14 +450,20 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
> struct drm_device *dev = intel_dig_port->base.base.dev;
> struct intel_connector *intel_connector;
> struct drm_connector *connector;
> - int i;
> + int i, ret;
>
> intel_connector = intel_connector_alloc();
> if (!intel_connector)
> return NULL;
>
> connector = &intel_connector->base;
> - drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
> + ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
> + DRM_MODE_CONNECTOR_DisplayPort);
> + if (ret) {
> + intel_connector_free(intel_connector);
> + return NULL;
> + }
> +
> drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
>
> intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
> @@ -465,15 +471,26 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
> intel_connector->port = port;
>
> for (i = PIPE_A; i <= PIPE_C; i++) {
> - drm_mode_connector_attach_encoder(&intel_connector->base,
> - &intel_dp->mst_encoders[i]->base.base);
> + struct drm_encoder *enc = &intel_dp->mst_encoders[i]->base.base;
> +
> + ret = drm_mode_connector_attach_encoder(&intel_connector->base,
> + enc);
> + if (ret)
> + goto err;
> }
>
> drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
> drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
>
> - drm_mode_connector_set_path_property(connector, pathprop);
> + ret = drm_mode_connector_set_path_property(connector, pathprop);
> + if (ret)
> + goto err;
> +
> return connector;
> +
> +err:
> + drm_connector_cleanup(connector);
> + return NULL;
> }
>
> static void intel_dp_register_mst_connector(struct drm_connector *connector)
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 0cab667fff57..b549a0b45e57 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1360,6 +1360,7 @@ void intel_pps_unlock_regs_wa(struct drm_i915_private *dev_priv);
> void intel_encoder_destroy(struct drm_encoder *encoder);
> int intel_connector_init(struct intel_connector *);
> struct intel_connector *intel_connector_alloc(void);
> +void intel_connector_free(struct intel_connector *connector);
> bool intel_connector_get_hw_state(struct intel_connector *connector);
> void intel_connector_attach_encoder(struct intel_connector *connector,
> struct intel_encoder *encoder);
> --
> 2.14.1
>
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--

James Ausmus