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drm/fb-helper: Push down modeset lock into FB helpers 

Move the modeset locking from drivers into FB helpers.

v2: Also handle intel_connector_add_to_fbdev.

v3: Prevent race in intel_dp_mst with ->detect (Maarten)

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Thierry Reding <treding@nvidia.com> (v1)
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170704151833.17304-2-daniel.vetter@ffwll.ch
This commit is contained in:
Thierry Reding 2017-07-04 17:18:21 +02:00 committed by Daniel Vetter
parent e6090cc9be
commit af2405af07
3 changed files with 37 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/gpu/drm/drm_fb_helper.c
View File

@ -109,8 +109,8 @@ static DEFINE_MUTEX(kernel_fb_helper_lock);
for (({ lockdep_assert_held(&(fbh)->dev->mode_config.mutex); }), \
i__ = 0; i__ < (fbh)->connector_count; i__++)
int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
struct drm_connector *connector)
static int __drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
struct drm_connector *connector)
{
struct drm_fb_helper_connector *fb_conn;
struct drm_fb_helper_connector **temp;
@ -141,8 +141,23 @@ int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
drm_connector_get(connector);
fb_conn->connector = connector;
fb_helper->connector_info[fb_helper->connector_count++] = fb_conn;
return 0;
}
int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
struct drm_connector *connector)
{
int err;
mutex_lock(&fb_helper->dev->mode_config.mutex);
err = __drm_fb_helper_add_one_connector(fb_helper, connector);
mutex_unlock(&fb_helper->dev->mode_config.mutex);
return err;
}
EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
/**
@ -172,8 +187,7 @@ int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
mutex_lock(&dev->mode_config.mutex);
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
ret = drm_fb_helper_add_one_connector(fb_helper, connector);
ret = __drm_fb_helper_add_one_connector(fb_helper, connector);
if (ret)
goto fail;
}
@ -198,8 +212,8 @@ out:
}
EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
struct drm_connector *connector)
static int __drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
struct drm_connector *connector)
{
struct drm_fb_helper_connector *fb_helper_connector;
int i, j;
@ -227,6 +241,20 @@ int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
return 0;
}
int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
struct drm_connector *connector)
{
int err;
mutex_lock(&fb_helper->dev->mode_config.mutex);
err = __drm_fb_helper_remove_one_connector(fb_helper, connector);
mutex_unlock(&fb_helper->dev->mode_config.mutex);
return err;
}
EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)

9
drivers/gpu/drm/i915/intel_dp_mst.c
View File

@ -501,11 +501,8 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
static void intel_dp_register_mst_connector(struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
struct drm_device *dev = connector->dev;
drm_modeset_lock_all(dev);
intel_connector_add_to_fbdev(intel_connector);
drm_modeset_unlock_all(dev);
drm_connector_register(&intel_connector->base);
}
@ -514,15 +511,15 @@ static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
struct drm_device *dev = connector->dev;
drm_connector_unregister(connector);
/* need to nuke the connector */
drm_modeset_lock_all(dev);
intel_connector_remove_from_fbdev(intel_connector);
/* prevent race with the check in ->detect */
drm_modeset_lock(&connector->dev->mode_config.connection_mutex, NULL);
intel_connector->mst_port = NULL;
drm_modeset_unlock_all(dev);
drm_modeset_unlock(&connector->dev->mode_config.connection_mutex);
drm_connector_unreference(&intel_connector->base);
DRM_DEBUG_KMS("\n");

7
drivers/gpu/drm/radeon/radeon_dp_mst.c
View File

@ -300,9 +300,7 @@ static void radeon_dp_register_mst_connector(struct drm_connector *connector)
struct drm_device *dev = connector->dev;
struct radeon_device *rdev = dev->dev_private;
drm_modeset_lock_all(dev);
radeon_fb_add_connector(rdev, connector);
drm_modeset_unlock_all(dev);
drm_connector_register(connector);
}
@ -315,13 +313,8 @@ static void radeon_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
struct radeon_device *rdev = dev->dev_private;
drm_connector_unregister(connector);
/* need to nuke the connector */
drm_modeset_lock_all(dev);
/* dpms off */
radeon_fb_remove_connector(rdev, connector);
drm_connector_cleanup(connector);
drm_modeset_unlock_all(dev);
kfree(connector);
DRM_DEBUG_KMS("\n");