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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
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19
include/drm/drmP.h
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@@ -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 */
/*@{*/