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

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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 <[email protected]>
Requested-by: Linus Torvalds <[email protected]>
Acked-by: Dave Airlie <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Eric Anholt 2009-01-27 21:19:41 -08:00 • committed by Linus Torvalds
commit 30b2363408
3 changed files with 24 additions and 148 deletions
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2
include/drm/drm.h
View file

@ -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)

9
include/drm/drmP.h
View file

@ -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 */