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From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: DRI Development <dri-devel@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>,
	Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
	Thierry Reding <treding@nvidia.com>,
	Daniel Vetter <daniel.vetter@intel.com>
Subject: [PATCH 08/12] drm/fb-helper: Stop using mode_config.mutex for internals
Date: Wed, 21 Jun 2017 20:28:11 +0200	[thread overview]
Message-ID: <20170621182815.14602-9-daniel.vetter@ffwll.ch> (raw)
In-Reply-To: <20170621182815.14602-1-daniel.vetter@ffwll.ch>

Those are now all protected using fb_helper->lock.

v2: We still need to hold mode_config.mutex right around calling
connector->fill_modes.

Cc: John Stultz <john.stultz@linaro.org>
Cc: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/drm_fb_helper.c | 21 +++------------------
 drivers/gpu/drm/drm_vblank.c    |  2 +-
 2 files changed, 4 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 400bbb07eff2..7aaac457eeaa 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;
@@ -1900,10 +1889,12 @@ static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
 	int count = 0;
 	int i;
 
+	mutex_lock(&fb_helper->dev->mode_config.mutex);
 	drm_fb_helper_for_each_connector(fb_helper, i) {
 		connector = fb_helper->connector_info[i]->connector;
 		count += connector->funcs->fill_modes(connector, maxX, maxY);
 	}
+	mutex_unlock(&fb_helper->dev->mode_config.mutex);
 
 	return count;
 }
@@ -2301,7 +2292,6 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
 
 	/* 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);
@@ -2428,12 +2418,10 @@ 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;
@@ -2496,10 +2484,7 @@ 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);
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 05d043e9219f..8099574c8a11 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -836,7 +836,7 @@ static void send_vblank_event(struct drm_device *dev,
  * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an
  * atomic commit must ensure that the next vblank happens at exactly the same
  * time as the atomic commit is committed to the hardware. This function itself
- * does **not** protect again the next vblank interrupt racing with either this
+ * does **not** protect against the next vblank interrupt racing with either this
  * function call or the atomic commit operation. A possible sequence could be:
  *
  * 1. Driver commits new hardware state into vblank-synchronized registers.
-- 
2.11.0

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  parent reply	other threads:[~2017-06-21 18:28 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-21 18:28 [PATCH 00/12] fbdev helper locking rework and deferred setup Daniel Vetter
2017-06-21 18:28 ` [PATCH 01/12] drm/fb-helper: Push down modeset lock into FB helpers Daniel Vetter
2017-06-21 18:28 ` [PATCH 02/12] drm/i915: Drop FBDEV #ifdev in mst code Daniel Vetter
2017-06-21 18:28 ` [PATCH 03/12] drm/fb-helper: Add top-level lock Daniel Vetter
2017-06-21 18:28 ` [PATCH 04/12] drm/fb-helper: Push locking in fb_is_bound Daniel Vetter
2017-06-21 18:28 ` [PATCH 05/12] drm/fb-helper: Drop locking from the vsync wait ioctl code Daniel Vetter
2017-06-21 18:28 ` [PATCH 06/12] drm/fb-helper: Push locking into pan_display_atomic|legacy Daniel Vetter
2017-06-21 18:28 ` [PATCH 07/12] drm/fb-helper: Push locking into restore_fbdev_mode_atomic|legacy Daniel Vetter
2017-06-21 18:28 ` Daniel Vetter [this message]
2017-06-21 18:28 ` [PATCH 09/12] drm/fb-helper: Split dpms handling into legacy and atomic paths Daniel Vetter
2017-06-22 10:24   ` Peter Rosin
2017-06-21 18:28 ` [PATCH 10/12] drm/fb-helper: Support deferred setup Daniel Vetter
2017-06-23 13:31   ` [PATCH] " Daniel Vetter
2017-06-21 18:28 ` [PATCH 11/12] drm/exynos: Remove custom FB helper " Daniel Vetter
2017-06-21 18:28 ` [PATCH 12/12] drm/hisilicon: " Daniel Vetter
2017-06-21 18:48 ` ✓ Fi.CI.BAT: success for fbdev helper locking rework and " Patchwork
2017-06-21 23:01 ` [PATCH 00/12] " John Stultz
2017-06-22 14:54 ` Liviu Dudau
2017-06-23  7:38   ` Daniel Vetter
2017-06-23 12:34     ` Liviu Dudau
2017-06-23 14:09 ` ✓ Fi.CI.BAT: success for fbdev helper locking rework and deferred setup (rev2) Patchwork

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