[PATCH 25/52] drm: Manage drm_vblank_cleanup with drmm_

[Daniel Vetter]

Nothing special here, except that this is the first time that we
automatically clean up something that's initialized with an explicit
driver call. But the cleanup was done at the very of the release
sequence for all drivers, and that's still the case. At least without
more uses of drmm_ through explicit driver calls.

Also for this one we need drmm_kcalloc, so lets add those

Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
 drivers/gpu/drm/drm_drv.c      |  1 -
 drivers/gpu/drm/drm_internal.h |  1 -
 drivers/gpu/drm/drm_vblank.c   | 31 ++++++++++++-------------------
 include/drm/drm_managed.h      | 16 ++++++++++++++++
 4 files changed, 28 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 7b3df1188da9..b8db2cc4a19b 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -752,7 +752,6 @@ EXPORT_SYMBOL(devm_drm_dev_init);
  */
 void drm_dev_fini(struct drm_device *dev)
 {
-	drm_vblank_cleanup(dev);
 }
 EXPORT_SYMBOL(drm_dev_fini);
 
diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index cb09e95a795e..e67015d07c4c 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -94,7 +94,6 @@ void drm_managed_release(struct drm_device *dev);
 
 /* drm_vblank.c */
 void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe);
-void drm_vblank_cleanup(struct drm_device *dev);
 
 /* IOCTLS */
 int drm_wait_vblank_ioctl(struct drm_device *dev, void *data,
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 47fc4339ec7f..5a6ec8aa0873 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -30,6 +30,7 @@
 #include <drm/drm_crtc.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_framebuffer.h>
+#include <drm/drm_managed.h>
 #include <drm/drm_modeset_helper_vtables.h>
 #include <drm/drm_print.h>
 #include <drm/drm_vblank.h>
@@ -425,14 +426,10 @@ static void vblank_disable_fn(struct timer_list *t)
 	spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
 }
 
-void drm_vblank_cleanup(struct drm_device *dev)
+static void drm_vblank_init_release(struct drm_device *dev, void *ptr)
 {
 	unsigned int pipe;
 
-	/* Bail if the driver didn't call drm_vblank_init() */
-	if (dev->num_crtcs == 0)
-		return;
-
 	for (pipe = 0; pipe < dev->num_crtcs; pipe++) {
 		struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
 
@@ -441,10 +438,6 @@ void drm_vblank_cleanup(struct drm_device *dev)
 
 		del_timer_sync(&vblank->disable_timer);
 	}
-
-	kfree(dev->vblank);
-
-	dev->num_crtcs = 0;
 }
 
 /**
@@ -453,25 +446,29 @@ void drm_vblank_cleanup(struct drm_device *dev)
  * @num_crtcs: number of CRTCs supported by @dev
  *
  * This function initializes vblank support for @num_crtcs display pipelines.
- * Cleanup is handled by the DRM core, or through calling drm_dev_fini() for
- * drivers with a &drm_driver.release callback.
+ * Cleanup is handled automatically through a cleanup function added with
+ * drmm_add_action().
  *
  * Returns:
  * Zero on success or a negative error code on failure.
  */
 int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
 {
-	int ret = -ENOMEM;
+	int ret;
 	unsigned int i;
 
 	spin_lock_init(&dev->vbl_lock);
 	spin_lock_init(&dev->vblank_time_lock);
 
+	dev->vblank = drmm_kcalloc(dev, num_crtcs, sizeof(*dev->vblank), GFP_KERNEL);
+	if (!dev->vblank)
+		return -ENOMEM;
+
 	dev->num_crtcs = num_crtcs;
 
-	dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL);
-	if (!dev->vblank)
-		goto err;
+	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];
@@ -486,10 +483,6 @@ int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
 	DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n");
 
 	return 0;
-
-err:
-	dev->num_crtcs = 0;
-	return ret;
 }
 EXPORT_SYMBOL(drm_vblank_init);
 
diff --git a/include/drm/drm_managed.h b/include/drm/drm_managed.h
index df30f9355902..573cadca4b3d 100644
--- a/include/drm/drm_managed.h
+++ b/include/drm/drm_managed.h
@@ -2,6 +2,7 @@
 
 #include <linux/types.h>
 #include <linux/gfp.h>
+#include <linux/overflow.h>
 
 struct drm_device;
 
@@ -25,6 +26,21 @@ static inline void *drmm_kzalloc(struct drm_device *dev, size_t size, gfp_t gfp)
 {
 	return drmm_kmalloc(dev, size, gfp | __GFP_ZERO);
 }
+static inline void *drmm_kmalloc_array(struct drm_device *dev,
+				       size_t n, size_t size, gfp_t flags)
+{
+	size_t bytes;
+
+	if (unlikely(check_mul_overflow(n, size, &bytes)))
+		return NULL;
+
+	return drmm_kmalloc(dev, bytes, flags);
+}
+static inline void *drmm_kcalloc(struct drm_device *dev,
+				 size_t n, size_t size, gfp_t flags)
+{
+	return drmm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
+}
 char *drmm_kstrdup(struct drm_device *dev, const char *s, gfp_t gfp);
 
 void drmm_kfree(struct drm_device *dev, void *data);
-- 
2.24.1