diff options
Diffstat (limited to 'linux')
| -rw-r--r-- | linux/drmP.h | 1 | ||||
| -rw-r--r-- | linux/lists.c | 41 |
2 files changed, 17 insertions, 25 deletions
diff --git a/linux/drmP.h b/linux/drmP.h index 0fa20571..aa9bc01a 100644 --- a/linux/drmP.h +++ b/linux/drmP.h @@ -328,6 +328,7 @@ typedef struct drm_freelist { int low_mark; /* Low water mark */ int high_mark; /* High water mark */ atomic_t wfh; /* If waiting for high mark */ + spinlock_t lock; } drm_freelist_t; typedef struct drm_buf_entry { diff --git a/linux/lists.c b/linux/lists.c index f62495aa..5da7cc6c 100644 --- a/linux/lists.c +++ b/linux/lists.c @@ -116,6 +116,7 @@ int drm_freelist_create(drm_freelist_t *bl, int count) bl->low_mark = 0; bl->high_mark = 0; atomic_set(&bl->wfh, 0); + bl->lock = SPIN_LOCK_UNLOCKED; ++bl->initialized; return 0; } @@ -130,8 +131,6 @@ int drm_freelist_destroy(drm_freelist_t *bl) int drm_freelist_put(drm_device_t *dev, drm_freelist_t *bl, drm_buf_t *buf) { - drm_buf_t *old, *prev; - int count = 0; drm_device_dma_t *dma = dev->dma; if (!dma) { @@ -152,15 +151,12 @@ int drm_freelist_put(drm_device_t *dev, drm_freelist_t *bl, drm_buf_t *buf) drm_histogram_compute(dev, buf); #endif buf->list = DRM_LIST_FREE; - do { - old = bl->next; - buf->next = old; - prev = cmpxchg(&bl->next, old, buf); - if (++count > DRM_LOOPING_LIMIT) { - DRM_ERROR("Looping\n"); - return 1; - } - } while (prev != old); + + spin_lock(&bl->lock); + buf->next = bl->next; + bl->next = buf; + spin_unlock(&bl->lock); + atomic_inc(&bl->count); if (atomic_read(&bl->count) > dma->buf_count) { DRM_ERROR("%d of %d buffers free after addition of %d\n", @@ -177,26 +173,21 @@ int drm_freelist_put(drm_device_t *dev, drm_freelist_t *bl, drm_buf_t *buf) static drm_buf_t *drm_freelist_try(drm_freelist_t *bl) { - drm_buf_t *old, *new, *prev; drm_buf_t *buf; - int count = 0; if (!bl) return NULL; /* Get buffer */ - do { - old = bl->next; - if (!old) return NULL; - new = bl->next->next; - prev = cmpxchg(&bl->next, old, new); - if (++count > DRM_LOOPING_LIMIT) { - DRM_ERROR("Looping\n"); - return NULL; - } - } while (prev != old); - atomic_dec(&bl->count); + spin_lock(&bl->lock); + if (!bl->next) { + spin_unlock(&bl->lock); + return NULL; + } + buf = bl->next; + bl->next = bl->next->next; + spin_unlock(&bl->lock); - buf = old; + atomic_dec(&bl->count); buf->next = NULL; buf->list = DRM_LIST_NONE; DRM_DEBUG("%d, count = %d, wfh = %d, w%d, p%d\n", |