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From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: DRI Development <dri-devel@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@intel.com>,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
	Julia Lawall <julia.lawall@lip6.fr>
Subject: [PATCH 05/14] drm: Extract drm_master_open
Date: Tue, 14 Jun 2016 20:51:00 +0200	[thread overview]
Message-ID: <1465930269-7883-6-git-send-email-daniel.vetter@ffwll.ch> (raw)
In-Reply-To: <1465930269-7883-1-git-send-email-daniel.vetter@ffwll.ch>

And pull out the primary_client check to make it really obvious that
this can't happen on control/render nodes. Bonus that we can avoid the
master lock in this case.

v2: Don't leak locks on error path (and simplify control flow while
at it), reported by Julia.

Cc: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/drm_auth.c     | 19 ++++++++++++++++++-
 drivers/gpu/drm/drm_fops.c     | 13 ++-----------
 drivers/gpu/drm/drm_internal.h |  2 +-
 3 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
index 1d314ae13560..9c1e2081cd58 100644
--- a/drivers/gpu/drm/drm_auth.c
+++ b/drivers/gpu/drm/drm_auth.c
@@ -120,7 +120,7 @@ static struct drm_master *drm_master_create(struct drm_device *dev)
  * This function must be called with dev::struct_mutex held.
  * Returns negative error code on failure. Zero on success.
  */
-int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv)
+static int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv)
 {
 	struct drm_master *old_master;
 	int ret;
@@ -226,6 +226,23 @@ out_unlock:
 	return ret;
 }
 
+int drm_master_open(struct drm_file *file_priv)
+{
+	struct drm_device *dev = file_priv->minor->dev;
+	int ret = 0;
+
+	/* if there is no current master make this fd it, but do not create
+	 * any master object for render clients */
+	mutex_lock(&dev->master_mutex);
+	if (!file_priv->minor->master)
+		ret = drm_new_set_master(dev, file_priv);
+	else
+		file_priv->master = drm_master_get(file_priv->minor->master);
+	mutex_unlock(&dev->master_mutex);
+
+	return ret;
+}
+
 struct drm_master *drm_master_get(struct drm_master *master)
 {
 	kref_get(&master->refcount);
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index 50b3de990aee..e2522672719a 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -229,19 +229,11 @@ static int drm_open_helper(struct file *filp, struct drm_minor *minor)
 			goto out_prime_destroy;
 	}
 
-	/* if there is no current master make this fd it, but do not create
-	 * any master object for render clients */
-	mutex_lock(&dev->master_mutex);
-	if (drm_is_primary_client(priv) && !priv->minor->master) {
-		/* create a new master */
-		ret = drm_new_set_master(dev, priv);
+	if (drm_is_primary_client(priv)) {
+		ret = drm_master_open(priv);
 		if (ret)
 			goto out_close;
-	} else if (drm_is_primary_client(priv)) {
-		/* get a reference to the master */
-		priv->master = drm_master_get(priv->minor->master);
 	}
-	mutex_unlock(&dev->master_mutex);
 
 	mutex_lock(&dev->filelist_mutex);
 	list_add(&priv->lhead, &dev->filelist);
@@ -270,7 +262,6 @@ static int drm_open_helper(struct file *filp, struct drm_minor *minor)
 	return 0;
 
 out_close:
-	mutex_unlock(&dev->master_mutex);
 	if (dev->driver->postclose)
 		dev->driver->postclose(dev, priv);
 out_prime_destroy:
diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index d29d426f633f..2b9a94f679ed 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -66,7 +66,7 @@ int drm_setmaster_ioctl(struct drm_device *dev, void *data,
 			struct drm_file *file_priv);
 int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
 			 struct drm_file *file_priv);
-int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv);
+int drm_master_open(struct drm_file *file_priv);
 
 /* drm_sysfs.c */
 extern struct class *drm_class;
-- 
2.8.1

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  parent reply	other threads:[~2016-06-14 18:51 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-14 18:50 [PATCH 00/14] Cruft removal around drm_master Daniel Vetter
2016-06-14 18:50 ` [PATCH 01/14] drm: Nuke legacy maps debugfs files Daniel Vetter
2016-06-15 11:23   ` Chris Wilson
2016-06-15 12:00   ` Emil Velikov
2016-06-14 18:50 ` [PATCH 02/14] drm: Hide hw.lock cleanup in filp->release better Daniel Vetter
2016-06-15 11:26   ` [Intel-gfx] " Chris Wilson
2016-06-15 12:10   ` Emil Velikov
2016-06-14 18:50 ` [PATCH 03/14] drm: Link directly from drm_master to drm_device Daniel Vetter
2016-06-15 11:29   ` Chris Wilson
2016-06-15 12:50   ` [Intel-gfx] " Emil Velikov
2016-06-15 15:45     ` Daniel Vetter
2016-06-16 20:04       ` Emil Velikov
2016-06-14 18:50 ` [PATCH 04/14] drm: Move master functions into drm_auth.c Daniel Vetter
2016-06-15 11:31   ` Chris Wilson
2016-06-15 15:47     ` Daniel Vetter
2016-06-14 18:51 ` Daniel Vetter [this message]
2016-06-15 11:41   ` [Intel-gfx] [PATCH 05/14] drm: Extract drm_master_open Chris Wilson
2016-06-14 18:51 ` [PATCH 06/14] drm: Extract drm_master_relase Daniel Vetter
2016-06-15 11:43   ` [Intel-gfx] " Chris Wilson
2016-06-16  8:18     ` Daniel Vetter
2016-06-14 18:51 ` [PATCH 07/14] drm: Only do the hw.lock cleanup in master_relase for !MODESET Daniel Vetter
2016-06-15 11:48   ` Chris Wilson
2016-06-15 15:49     ` [Intel-gfx] " Daniel Vetter
2016-06-14 18:51 ` [PATCH 08/14] drm: Move authmagic cleanup into drm_master_release Daniel Vetter
2016-06-15 11:51   ` Chris Wilson
2016-06-14 18:51 ` [PATCH 09/14] drm: Protect authmagic with master_mutex Daniel Vetter
2016-06-15 11:54   ` [Intel-gfx] " Chris Wilson
2016-06-15 15:52     ` Daniel Vetter
2016-06-14 18:51 ` [PATCH 10/14] drm: Mark authmagic ioctls as unlocked Daniel Vetter
2016-06-15 11:55   ` [Intel-gfx] " Chris Wilson
2016-06-14 18:51 ` [PATCH 11/14] drm: Mark set/drop master ioctl " Daniel Vetter
2016-06-15 11:56   ` [Intel-gfx] " Chris Wilson
2016-06-14 18:51 ` [PATCH 12/14] drm: Move master pointer from drm_minor to drm_device Daniel Vetter
2016-06-15 12:10   ` [Intel-gfx] " Chris Wilson
2016-06-15 16:01     ` Daniel Vetter
2016-06-15 16:33       ` Chris Wilson
2016-06-15 19:54         ` [Intel-gfx] " Daniel Vetter
2016-06-14 18:51 ` [PATCH 13/14] drm: Clean up drm_crtc.h Daniel Vetter
2016-06-14 18:51 ` [PATCH 14/14] drm: Use dev->name as fallback for dev->unique Daniel Vetter
2016-06-15  5:42 ` ✓ Ro.CI.BAT: success for Cruft removal around drm_master Patchwork

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