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drm: drop redundant drm_file->is_master

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The drm_file->is_master field is redundant as it's equivalent to:
    drm_file->master && drm_file->master == drm_file->minor->master

1) "=>"
  Whenever we set drm_file->is_master, we also set:
      drm_file->minor->master = drm_file->master;

  Whenever we clear drm_file->is_master, we also call:
      drm_master_put(&drm_file->minor->master);
  which implicitly clears it to NULL.

2) "<="
  minor->master cannot be set if it is non-NULL. Therefore, it stays as
  is unless a file drops it.

  If minor->master is NULL, it is only set by places that also adjust
  drm_file->is_master.

Therefore, we can safely drop is_master and replace it by an inline helper
that matches:
    drm_file->master && drm_file->master == drm_file->minor->master

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
This commit is contained in:
David Herrmann 2014-07-22 18:46:09 +02:00
parent 9f8d21ea27
commit 48ba813701
9 changed files with 27 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/drm_crtc.c
View File

@ -3243,7 +3243,7 @@ int drm_mode_getfb(struct drm_device *dev,
r->bpp = fb->bits_per_pixel;
r->pitch = fb->pitches[0];
if (fb->funcs->create_handle) {
if (file_priv->is_master || capable(CAP_SYS_ADMIN) ||
if (drm_is_master(file_priv) || capable(CAP_SYS_ADMIN) ||
drm_is_control_client(file_priv)) {
ret = fb->funcs->create_handle(fb, file_priv,
&r->handle);

2
drivers/gpu/drm/drm_drv.c
View File

@ -307,7 +307,7 @@ static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
return -EACCES;
/* MASTER is only for master or control clients */
if (unlikely((flags & DRM_MASTER) && !file_priv->is_master &&
if (unlikely((flags & DRM_MASTER) && !drm_is_master(file_priv) &&
!drm_is_control_client(file_priv)))
return -EACCES;

4
drivers/gpu/drm/drm_fops.c
View File

@ -233,7 +233,6 @@ static int drm_open_helper(struct file *filp, struct drm_minor *minor)
goto out_close;
}
priv->is_master = 1;
/* take another reference for the copy in the local file priv */
priv->master = drm_master_get(priv->minor->master);
priv->authenticated = 1;
@ -461,7 +460,7 @@ int drm_release(struct inode *inode, struct file *filp)
mutex_lock(&dev->master_mutex);
if (file_priv->is_master) {
if (drm_is_master(file_priv)) {
struct drm_master *master = file_priv->master;
struct drm_file *temp;
@ -497,7 +496,6 @@ int drm_release(struct inode *inode, struct file *filp)
/* drop the master reference held by the file priv */
if (file_priv->master)
drm_master_put(&file_priv->master);
file_priv->is_master = 0;
mutex_unlock(&dev->master_mutex);
mutex_lock(&dev->struct_mutex);

2
drivers/gpu/drm/drm_lock.c
View File

@ -111,7 +111,7 @@ int drm_lock(struct drm_device *dev, void *data, struct drm_file *file_priv)
/* don't set the block all signals on the master process for now
* really probably not the correct answer but lets us debug xkb
* xserver for now */
if (!file_priv->is_master) {
if (!drm_is_master(file_priv)) {
sigemptyset(&dev->sigmask);
sigaddset(&dev->sigmask, SIGSTOP);
sigaddset(&dev->sigmask, SIGTSTP);

10
drivers/gpu/drm/drm_stub.c
View File

@ -177,7 +177,7 @@ int drm_setmaster_ioctl(struct drm_device *dev, void *data,
int ret = 0;
mutex_lock(&dev->master_mutex);
if (file_priv->is_master)
if (drm_is_master(file_priv))
goto out_unlock;
if (file_priv->minor->master) {
@ -191,13 +191,10 @@ int drm_setmaster_ioctl(struct drm_device *dev, void *data,
}
file_priv->minor->master = drm_master_get(file_priv->master);
file_priv->is_master = 1;
if (dev->driver->master_set) {
ret = dev->driver->master_set(dev, file_priv, false);
if (unlikely(ret != 0)) {
file_priv->is_master = 0;
if (unlikely(ret != 0))
drm_master_put(&file_priv->minor->master);
}
}
out_unlock:
@ -211,7 +208,7 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
int ret = -EINVAL;
mutex_lock(&dev->master_mutex);
if (!file_priv->is_master)
if (!drm_is_master(file_priv))
goto out_unlock;
if (!file_priv->minor->master)
@ -221,7 +218,6 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
if (dev->driver->master_drop)
dev->driver->master_drop(dev, file_priv, false);
drm_master_put(&file_priv->minor->master);
file_priv->is_master = 0;
out_unlock:
mutex_unlock(&dev->master_mutex);

4
drivers/gpu/drm/i915/i915_gem_execbuffer.c
View File

@ -1260,7 +1260,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
flags = 0;
if (args->flags & I915_EXEC_SECURE) {
if (!file->is_master || !capable(CAP_SYS_ADMIN))
if (!drm_is_master(file) || !capable(CAP_SYS_ADMIN))
return -EPERM;
flags |= I915_DISPATCH_SECURE;
@ -1369,7 +1369,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
ret = i915_parse_cmds(ring,
batch_obj,
args->batch_start_offset,
file->is_master);
drm_is_master(file));
if (ret)
goto err;

2
drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
View File

@ -990,7 +990,7 @@ static struct vmw_master *vmw_master_check(struct drm_device *dev,
if (unlikely(ret != 0))
return ERR_PTR(-ERESTARTSYS);
if (file_priv->is_master) {
if (drm_is_master(file_priv)) {
mutex_unlock(&dev->master_mutex);
return NULL;
}

2
drivers/staging/imx-drm/imx-drm-core.c
View File

@ -182,7 +182,7 @@ static void imx_drm_driver_preclose(struct drm_device *drm,
{
int i;
if (!file->is_master)
if (!drm_is_master(file))
return;
for (i = 0; i < MAX_CRTC; i++)

19
include/drm/drmP.h
View File

@ -387,8 +387,6 @@ struct drm_prime_file_private {
struct drm_file {
unsigned always_authenticated :1;
unsigned authenticated :1;
/* Whether we're master for a minor. Protected by master_mutex */
unsigned is_master :1;
/* true when the client has asked us to expose stereo 3D mode flags */
unsigned stereo_allowed :1;
/*
@ -1034,7 +1032,7 @@ struct drm_device {
/** \name Locks */
/*@{ */
struct mutex struct_mutex; /**< For others */
struct mutex master_mutex; /**< For drm_minor::master and drm_file::is_master */
struct mutex master_mutex; /**< For drm_minor::master */
/*@} */
/** \name Usage Counters */
@ -1172,6 +1170,21 @@ static inline bool drm_is_primary_client(const struct drm_file *file_priv)
return file_priv->minor->type == DRM_MINOR_LEGACY;
}
/**
* drm_is_master() - Check whether a DRM open-file is DRM-Master
* @file: DRM open-file context
*
* This checks whether a DRM open-file context is owner of the master context
* attached to it. If a file owns a master context, it's called DRM-Master.
* Per DRM device, only one such file can be DRM-Master at a time.
*
* Returns: True if the file is DRM-Master, otherwise false.
*/
static inline bool drm_is_master(const struct drm_file *file)
{
return file->master && file->master == file->minor->master;
}
/******************************************************************/
/** \name Internal function definitions */
/*@{*/