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| author | Paul Mundt <lethal@linux-sh.org> | 2010-11-24 16:21:08 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2010-11-24 16:21:08 +0900 |
| commit | 540565257101f7c52b6fc5a57651f7505f8d20fe (patch) | |
| tree | 7adee0bc65a02fead0dd9cae4f2d4632b227ac56 /drivers/gpu/drm/ttm/ttm_bo.c | |
| parent | 4d048435e9864998f6a6ad16422393d42322716d (diff) | |
| parent | 421b446abeec55bed1251fab80cb5c12be58b773 (diff) | |
Merge branch 'rmobile/fsi-despair' into rmobile-fixes-for-linus
Diffstat (limited to 'drivers/gpu/drm/ttm/ttm_bo.c')
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_bo.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c index 3ca77dc0391..148a322d8f5 100644 --- a/drivers/gpu/drm/ttm/ttm_bo.c +++ b/drivers/gpu/drm/ttm/ttm_bo.c @@ -224,6 +224,9 @@ int ttm_bo_reserve_locked(struct ttm_buffer_object *bo, int ret; while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) { + /** + * Deadlock avoidance for multi-bo reserving. + */ if (use_sequence && bo->seq_valid && (sequence - bo->val_seq < (1 << 31))) { return -EAGAIN; @@ -241,6 +244,14 @@ int ttm_bo_reserve_locked(struct ttm_buffer_object *bo, } if (use_sequence) { + /** + * Wake up waiters that may need to recheck for deadlock, + * if we decreased the sequence number. + */ + if (unlikely((bo->val_seq - sequence < (1 << 31)) + || !bo->seq_valid)) + wake_up_all(&bo->event_queue); + bo->val_seq = sequence; bo->seq_valid = true; } else { |