drm: Rip out the racy, unused vblank signal code.

Schedule a vblank signal, kill the process, and we'll go walking over freed
memory.  Given that no open-source userland exists using this, nor have I
ever heard of a consumer, just let this code die.

Signed-off-by: Eric Anholt <eric@anholt.net>
Requested-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Dave Airlie <airlied@linux.ie>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 1 insertions, 10 deletions

diff --git a/include/drm/drm.h b/include/drm/drm.h
index 32e5096554e..8e77357334a 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -458,7 +458,7 @@ enum drm_vblank_seq_type {
         _DRM_VBLANK_FLIP = 0x8000000,   /**< Scheduled buffer swap should flip */
         _DRM_VBLANK_NEXTONMISS = 0x10000000,    /**< If missed, wait for next vblank */
         _DRM_VBLANK_SECONDARY = 0x20000000,     /**< Secondary display controller */
-        _DRM_VBLANK_SIGNAL = 0x40000000 /**< Send signal instead of blocking */
+        _DRM_VBLANK_SIGNAL = 0x40000000 /**< Send signal instead of blocking, unsupported */
 };
 
 #define _DRM_VBLANK_TYPES_MASK (_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE)
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index afb7858c068..8190b9bcc2d 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -545,13 +545,6 @@ struct drm_ctx_list {
         struct drm_file *tag;           /**< associated fd private data */
 };
 
-struct drm_vbl_sig {
-        struct list_head head;
-        unsigned int sequence;
-        struct siginfo info;
-        struct task_struct *task;
-};
-
 /* location of GART table */
 #define DRM_ATI_GART_MAIN 1
 #define DRM_ATI_GART_FB   2
@@ -903,8 +896,6 @@ struct drm_device {
         wait_queue_head_t *vbl_queue;   /**< VBLANK wait queue */
         atomic_t *_vblank_count;        /**< number of VBLANK interrupts (driver must alloc the right number of counters) */
         spinlock_t vbl_lock;
-        struct list_head *vbl_sigs;     /**< signal list to send on VBLANK */
-        atomic_t vbl_signal_pending;    /* number of signals pending on all crtcs*/
         atomic_t *vblank_refcount;      /* number of users of vblank interruptsper crtc */
         u32 *last_vblank;               /* protected by dev->vbl_lock, used */
                                         /* for wraparound handling */