diff options
Diffstat (limited to 'linux/lists.c')
| -rw-r--r-- | linux/lists.c | 35 |
1 files changed, 14 insertions, 21 deletions
diff --git a/linux/lists.c b/linux/lists.c index 3d1263d0..b84561f2 100644 --- a/linux/lists.c +++ b/linux/lists.c @@ -1,6 +1,6 @@ /* lists.c -- Buffer list handling routines -*- linux-c -*- * Created: Mon Apr 19 20:54:22 1999 by faith@precisioninsight.com - * Revised: Fri Aug 20 09:27:01 1999 by faith@precisioninsight.com + * Revised: Mon Dec 6 16:04:44 1999 by faith@precisioninsight.com * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * All Rights Reserved. @@ -130,11 +130,9 @@ int drm_freelist_destroy(drm_freelist_t *bl) int drm_freelist_put(drm_device_t *dev, drm_freelist_t *bl, drm_buf_t *buf) { - unsigned int old; - unsigned int new; - char failed; + drm_buf_t *old, *prev; int count = 0; - drm_device_dma_t *dma = dev->dma; + drm_device_dma_t *dma = dev->dma; if (!dma) { DRM_ERROR("No DMA support\n"); @@ -155,15 +153,14 @@ int drm_freelist_put(drm_device_t *dev, drm_freelist_t *bl, drm_buf_t *buf) #endif buf->list = DRM_LIST_FREE; do { - old = (unsigned long)bl->next; - buf->next = (void *)old; - new = (unsigned long)buf; - _DRM_CAS(&bl->next, old, new, failed); + old = bl->next; + bl->next = old; + prev = cmpxchg(&bl->next, old, buf); if (++count > DRM_LOOPING_LIMIT) { DRM_ERROR("Looping\n"); return 1; } - } while (failed); + } while (prev != old); atomic_inc(&bl->count); if (atomic_read(&bl->count) > dma->buf_count) { DRM_ERROR("%d of %d buffers free after addition of %d\n", @@ -180,9 +177,7 @@ 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) { - unsigned int old; - unsigned int new; - char failed; + drm_buf_t *old, *new, *prev; drm_buf_t *buf; int count = 0; @@ -190,20 +185,18 @@ static drm_buf_t *drm_freelist_try(drm_freelist_t *bl) /* Get buffer */ do { - old = (unsigned int)bl->next; - if (!old) { - return NULL; - } - new = (unsigned long)bl->next->next; - _DRM_CAS(&bl->next, old, new, failed); + 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 (failed); + } while (prev != old); atomic_dec(&bl->count); - buf = (drm_buf_t *)old; + buf = old; buf->next = NULL; buf->list = DRM_LIST_NONE; DRM_DEBUG("%d, count = %d, wfh = %d, w%d, p%d\n", |