linux-kernel - [RFC v3 01/11] drm/vblank: Register drmm cleanup action once per drm_vblank

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Date:   Fri, 17 Apr 2020 15:40:48 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org
Subject: [RFC v3 01/11] drm/vblank: Register drmm cleanup action once per drm_vblank_crtc

Since we'll be allocating resources for kthread_create_worker() in the
next commit (which could fail and require us to clean up the mess),
let's simplify the cleanup process a bit by registering a
drm_vblank_init_release() action for each drm_vblank_crtc so they're
still cleaned up if we fail to initialize one of them.

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 drivers/gpu/drm/drm_vblank.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 758bf74e1cab..bf8de10c131f 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -491,16 +491,12 @@ static void vblank_disable_fn(struct timer_list *t)
 
 static void drm_vblank_init_release(struct drm_device *dev, void *ptr)
 {
-	unsigned int pipe;
-
-	for (pipe = 0; pipe < dev->num_crtcs; pipe++) {
-		struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
+	struct drm_vblank_crtc *vblank = ptr;
 
-		WARN_ON(READ_ONCE(vblank->enabled) &&
-			drm_core_check_feature(dev, DRIVER_MODESET));
+	WARN_ON(READ_ONCE(vblank->enabled) &&
+		drm_core_check_feature(dev, DRIVER_MODESET));
 
-		del_timer_sync(&vblank->disable_timer);
-	}
+	del_timer_sync(&vblank->disable_timer);
 }
 
 /**
@@ -529,10 +525,6 @@ int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
 
 	dev->num_crtcs = num_crtcs;
 
-	ret = drmm_add_action(dev, drm_vblank_init_release, NULL);
-	if (ret)
-		return ret;
-
 	for (i = 0; i < num_crtcs; i++) {
 		struct drm_vblank_crtc *vblank = &dev->vblank[i];
 
@@ -541,6 +533,12 @@ int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
 		init_waitqueue_head(&vblank->queue);
 		timer_setup(&vblank->disable_timer, vblank_disable_fn, 0);
 		seqlock_init(&vblank->seqlock);
+
+		ret = drmm_add_action(dev, drm_vblank_init_release, vblank);
+		if (ret) {
+			del_timer_sync(&vblank->disable_timer);
+			return ret;
+		}
 	}
 
 	DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n");
-- 
2.25.1