Despite the claims of
commit 48ba813701eb14b3008edefef4a0789b328e278c
Author: David Herrmann <dh.herrm...@gmail.com>
Date: Tue Jul 22 18:46:09 2014 +0200
drm: drop redundant drm_file->is_master
drm_file->is_master is not synomous with having drm_file->master ==
drm_file->minor->master. This is because drm_file->master is the same
for all drm_files of the same generation and so when there is a master,
every drm_file believes itself to be the master. Confusion ensues and
things go pear shaped when one file is closed and there is no master
anymore.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82283
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Alex Deucher <alexander.deuc...@amd.com>
Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
Cc: David Herrmann <dh.herrm...@gmail.com>
---
drivers/gpu/drm/drm_drv.c | 5 ++---
drivers/gpu/drm/drm_fops.c | 12 ++++++------
include/drm/drmP.h | 3 ++-
3 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index a1863d8..76cdb51 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -198,6 +198,7 @@ int drm_setmaster_ioctl(struct drm_device *dev, void *data,
if (unlikely(ret != 0))
drm_master_put(&file_priv->minor->master);
}
+ file_priv->is_master = ret == 0;
out_unlock:
mutex_unlock(&dev->master_mutex);
@@ -213,13 +214,11 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void
*data,
if (!drm_is_master(file_priv))
goto out_unlock;
- if (!file_priv->minor->master)
- goto out_unlock;
-
ret = 0;
if (dev->driver->master_drop)
dev->driver->master_drop(dev, file_priv, false);
drm_master_put(&file_priv->minor->master);
+ file_priv->is_master = false;
out_unlock:
mutex_unlock(&dev->master_mutex);
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index c0166ba..083f7b9 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -196,6 +196,7 @@ static int drm_open_helper(struct file *filp, struct
drm_minor *minor)
/* take another reference for the copy in the local file priv */
priv->master = drm_master_get(priv->minor->master);
+ priv->is_master = true;
priv->authenticated = 1;
if (dev->driver->master_create) {
@@ -434,12 +435,11 @@ int drm_release(struct inode *inode, struct file *filp)
}
mutex_unlock(&dev->struct_mutex);
- if (file_priv->minor->master == file_priv->master) {
- /* drop the reference held my the minor */
- if (dev->driver->master_drop)
- dev->driver->master_drop(dev, file_priv, true);
- drm_master_put(&file_priv->minor->master);
- }
+ /* drop the reference held my the minor */
+ if (dev->driver->master_drop)
+ dev->driver->master_drop(dev, file_priv, true);
+ drm_master_put(&file_priv->minor->master);
+ file_priv->is_master = false;
}
/* drop the master reference held by the file priv */
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 0ffce5c..70a6598 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -378,6 +378,7 @@ struct drm_prime_file_private {
/** File private data */
struct drm_file {
+ bool is_master:1;
unsigned authenticated :1;
/* true when the client has asked us to expose stereo 3D mode flags */
unsigned stereo_allowed :1;
@@ -1177,7 +1178,7 @@ static inline bool drm_is_primary_client(const struct
drm_file *file_priv)
*/
static inline bool drm_is_master(const struct drm_file *file)
{
- return file->master && file->master == file->minor->master;
+ return file->is_master;
}
/******************************************************************/
--
1.9.1
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