drm: WARN() when drm_connector_attach_property fails

Also return void instead of int. We have more than 100 callers and
no one checks for the return value.

If this function fails the property won't be exposed by the get/set
ioctls, but we should probably survive. If this starts happening,
the solution will be to increase DRM_CONNECTOR_MAX_PROPERTY and
recompile the Kernel.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rob Clark <rob.clark@linaro.org>
Tested-by: Rob Clark <rob.clark@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 0a22ef80d28e4318ebbf10b0b22734adf0cce00b..37bb7ab3cbb09ad5070123715fc30b54f9f8fc4d 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2819,7 +2819,7 @@ void drm_property_destroy(struct drm_device *dev, struct drm_property *property)
 }
 EXPORT_SYMBOL(drm_property_destroy);
 
-int drm_connector_attach_property(struct drm_connector *connector,
+void drm_connector_attach_property(struct drm_connector *connector,
                               struct drm_property *property, uint64_t init_val)
 {
        int i;
@@ -2828,13 +2828,13 @@ int drm_connector_attach_property(struct drm_connector *connector,
                if (connector->property_ids[i] == 0) {
                        connector->property_ids[i] = property->base.id;
                        connector->property_values[i] = init_val;
-                       break;
+                       return;
                }
        }
 
-       if (i == DRM_CONNECTOR_MAX_PROPERTY)
-               return -EINVAL;
-       return 0;
+       WARN(1, "Failed to attach connector property. Please increase "
+               "DRM_CONNECTOR_MAX_PROPERTY by 1 for each time you see this "
+               "message\n");
 }
 EXPORT_SYMBOL(drm_connector_attach_property);
 

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index f35e7edd7de2578c630ba4fca7cfb027f452a732..036faec8a6fe8c20fffaf96b7cdaa4c3eb42c7c2 100644 (file)
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -910,8 +910,8 @@ extern int drmfb_remove(struct drm_device *dev, struct drm_framebuffer *fb);
 extern void drm_crtc_probe_connector_modes(struct drm_device *dev, int maxX, int maxY);
 extern bool drm_crtc_in_use(struct drm_crtc *crtc);
 
-extern int drm_connector_attach_property(struct drm_connector *connector,
-                                     struct drm_property *property, uint64_t init_val);
+extern void drm_connector_attach_property(struct drm_connector *connector,
+                                         struct drm_property *property, uint64_t init_val);
 extern struct drm_property *drm_property_create(struct drm_device *dev, int flags,
                                                const char *name, int num_values);
 extern struct drm_property *drm_property_create_enum(struct drm_device *dev, int flags,