drm/fb-helper: Stop using mode_config.mutex for internals
Those are now all protected using fb_helper->lock.
v2: We still need to hold mode_config.mutex right around calling
connector->fill_modes.
v3: I forgot to hold mode_config.mutex while looking at
connector->status and the mode list. Also, we need to patch up the
i915 ->initial_config callback to grab the locks it needs to inspect
the modeset state recovered from the fw.
v4: Don't reorder the probe too much (Ville).
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Thierry Reding <treding@nvidia.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170705045629.31265-1-daniel.vetter@ffwll.ch
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index c5bf37f..5d3d776 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -106,7 +106,7 @@ static DEFINE_MUTEX(kernel_fb_helper_lock);
*/
#define drm_fb_helper_for_each_connector(fbh, i__) \
- for (({ lockdep_assert_held(&(fbh)->dev->mode_config.mutex); }), \
+ for (({ lockdep_assert_held(&(fbh)->lock); }), \
i__ = 0; i__ < (fbh)->connector_count; i__++)
static int __drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
@@ -120,7 +120,6 @@ static int __drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
return 0;
lockdep_assert_held(&fb_helper->lock);
- lockdep_assert_held(&fb_helper->dev->mode_config.mutex);
count = fb_helper->connector_count + 1;
@@ -152,11 +151,7 @@ int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
int err;
mutex_lock(&fb_helper->lock);
- 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);
mutex_unlock(&fb_helper->lock);
return err;
@@ -188,7 +183,6 @@ int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
return 0;
mutex_lock(&fb_helper->lock);
- 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);
@@ -210,7 +204,6 @@ int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
fb_helper->connector_count = 0;
out:
drm_connector_list_iter_end(&conn_iter);
- mutex_unlock(&dev->mode_config.mutex);
mutex_unlock(&fb_helper->lock);
return ret;
@@ -253,11 +246,7 @@ int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
int err;
mutex_lock(&fb_helper->lock);
- 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);
mutex_unlock(&fb_helper->lock);
return err;
@@ -1879,12 +1868,11 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe
EXPORT_SYMBOL(drm_fb_helper_fill_var);
static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
- uint32_t maxX,
- uint32_t maxY)
+ uint32_t maxX,
+ uint32_t maxY)
{
struct drm_connector *connector;
- int count = 0;
- int i;
+ int i, count = 0;
drm_fb_helper_for_each_connector(fb_helper, i) {
connector = fb_helper->connector_info[i]->connector;
@@ -2282,12 +2270,8 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
int i;
DRM_DEBUG_KMS("\n");
- if (drm_fb_helper_probe_connector_modes(fb_helper, width, height) == 0)
- DRM_DEBUG_KMS("No connectors reported connected with modes\n");
-
/* prevent concurrent modification of connector_count by hotplug */
lockdep_assert_held(&fb_helper->lock);
- lockdep_assert_held(&fb_helper->dev->mode_config.mutex);
crtcs = kcalloc(fb_helper->connector_count,
sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
@@ -2302,6 +2286,9 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
goto out;
}
+ mutex_lock(&fb_helper->dev->mode_config.mutex);
+ if (drm_fb_helper_probe_connector_modes(fb_helper, width, height) == 0)
+ DRM_DEBUG_KMS("No connectors reported connected with modes\n");
drm_enable_connectors(fb_helper, enabled);
if (!(fb_helper->funcs->initial_config &&
@@ -2323,6 +2310,7 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
}
+ mutex_unlock(&fb_helper->dev->mode_config.mutex);
/* need to set the modesets up here for use later */
/* fill out the connector<->crtc mappings into the modesets */
@@ -2414,12 +2402,10 @@ int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
return 0;
mutex_lock(&fb_helper->lock);
- mutex_lock(&dev->mode_config.mutex);
drm_setup_crtcs(fb_helper,
dev->mode_config.max_width,
dev->mode_config.max_height);
ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
- mutex_unlock(&dev->mode_config.mutex);
mutex_unlock(&fb_helper->lock);
if (ret)
return ret;
@@ -2482,10 +2468,7 @@ int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
DRM_DEBUG_KMS("\n");
- mutex_lock(&dev->mode_config.mutex);
drm_setup_crtcs(fb_helper, fb_helper->fb->width, fb_helper->fb->height);
-
- mutex_unlock(&dev->mode_config.mutex);
mutex_unlock(&fb_helper->lock);
drm_fb_helper_set_par(fb_helper->fbdev);