blob: 2aa73a0a652131919f73e23b3be829f8f8f7e9b7 [file] [log] [blame]
From 074b37ef3c0c37561b819c15d7483f154f77efab Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu, 15 Aug 2013 00:02:44 +0200
Subject: drm/gem: switch dev->object_name_lock to a mutex
I want to wrap the creation of a dma-buf from a gem object in it,
so that the obj->export_dma_buf cache can be atomically filled in.
Instead of creating a new mutex just for that variable I've figured
I can reuse the existing dev->object_name_lock, especially since
the new semantics will exactly mirror the flink obj->name already
protected by that lock.
v2: idr_preload/idr_preload_end is now an atomic section, so need to
move the mutex locking outside.
[airlied: fix up conflict with patch to make debugfs use lock]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
(cherry picked from commit cd4f013f3a4b6a55d484cc2e206dc08e055e5291)
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
---
drivers/gpu/drm/drm_gem.c | 18 +++++++++---------
drivers/gpu/drm/drm_info.c | 4 ++--
include/drm/drmP.h | 2 +-
3 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index f8d2e63581e2..16af10030b42 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -93,7 +93,7 @@ drm_gem_init(struct drm_device *dev)
{
struct drm_gem_mm *mm;
- spin_lock_init(&dev->object_name_lock);
+ mutex_init(&dev->object_name_lock);
idr_init(&dev->object_name_idr);
mm = kzalloc(sizeof(struct drm_gem_mm), GFP_KERNEL);
@@ -243,10 +243,10 @@ drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
* checked for a name
*/
- spin_lock(&obj->dev->object_name_lock);
+ mutex_lock(&obj->dev->object_name_lock);
if (--obj->handle_count == 0)
drm_gem_object_handle_free(obj);
- spin_unlock(&obj->dev->object_name_lock);
+ mutex_unlock(&obj->dev->object_name_lock);
drm_gem_object_unreference_unlocked(obj);
}
@@ -324,16 +324,16 @@ drm_gem_handle_create(struct drm_file *file_priv,
* Get the user-visible handle using idr. Preload and perform
* allocation under our spinlock.
*/
+ mutex_lock(&dev->object_name_lock);
idr_preload(GFP_KERNEL);
- spin_lock(&dev->object_name_lock);
spin_lock(&file_priv->table_lock);
ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT);
drm_gem_object_reference(obj);
obj->handle_count++;
spin_unlock(&file_priv->table_lock);
- spin_unlock(&dev->object_name_lock);
idr_preload_end();
+ mutex_unlock(&dev->object_name_lock);
if (ret < 0) {
drm_gem_object_handle_unreference_unlocked(obj);
return ret;
@@ -455,8 +455,8 @@ drm_gem_flink_ioctl(struct drm_device *dev, void *data,
if (obj == NULL)
return -ENOENT;
+ mutex_lock(&dev->object_name_lock);
idr_preload(GFP_KERNEL);
- spin_lock(&dev->object_name_lock);
/* prevent races with concurrent gem_close. */
if (obj->handle_count == 0) {
ret = -ENOENT;
@@ -478,8 +478,8 @@ drm_gem_flink_ioctl(struct drm_device *dev, void *data,
ret = 0;
err:
- spin_unlock(&dev->object_name_lock);
idr_preload_end();
+ mutex_unlock(&dev->object_name_lock);
drm_gem_object_unreference_unlocked(obj);
return ret;
}
@@ -502,11 +502,11 @@ drm_gem_open_ioctl(struct drm_device *dev, void *data,
if (!(dev->driver->driver_features & DRIVER_GEM))
return -ENODEV;
- spin_lock(&dev->object_name_lock);
+ mutex_lock(&dev->object_name_lock);
obj = idr_find(&dev->object_name_idr, (int) args->name);
if (obj)
drm_gem_object_reference(obj);
- spin_unlock(&dev->object_name_lock);
+ mutex_unlock(&dev->object_name_lock);
if (!obj)
return -ENOENT;
diff --git a/drivers/gpu/drm/drm_info.c b/drivers/gpu/drm/drm_info.c
index 5351e811c421..53298320080b 100644
--- a/drivers/gpu/drm/drm_info.c
+++ b/drivers/gpu/drm/drm_info.c
@@ -219,9 +219,9 @@ int drm_gem_name_info(struct seq_file *m, void *data)
seq_printf(m, " name size handles refcount\n");
- spin_lock(&dev->object_name_lock);
+ mutex_lock(&dev->object_name_lock);
idr_for_each(&dev->object_name_idr, drm_gem_one_name_info, m);
- spin_unlock(&dev->object_name_lock);
+ mutex_unlock(&dev->object_name_lock);
return 0;
}
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index a2bf60db69f9..52bf270b2d5a 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1205,7 +1205,7 @@ struct drm_device {
/** \name GEM information */
/*@{ */
- spinlock_t object_name_lock;
+ struct mutex object_name_lock;
struct idr object_name_idr;
/*@} */
int switch_power_state;
--
1.8.5.rc3