From e13a058310509b22b2b45cbdd82d8797e173c3db Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Wed, 5 Jul 2017 06:56:29 +0200 Subject: drm/fb-helper: Stop using mode_config.mutex for internals MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Cc: John Stultz Cc: Thierry Reding Reviewed-by: Maarten Lankhorst Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/20170705045629.31265-1-daniel.vetter@ffwll.ch --- drivers/gpu/drm/drm_fb_helper.c | 33 ++++++++------------------------- 1 file changed, 8 insertions(+), 25 deletions(-) (limited to 'drivers/gpu/drm/drm_fb_helper.c') diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index c5bf37f3bcdd..5d3d776508b3 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 @@ fail: 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); -- cgit v1.2.3