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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2017-06-30 00:05:32 +0300 |
|---|---|---|
| committer | Gustavo Padovan <gustavo.padovan@collabora.com> | 2017-06-30 00:53:47 +0300 |
| commit | d3862e44daa7a0c94d2f6193502a8c49379acfce (patch) | |
| tree | 6716a8b2f9830b5b052837f2eddd40c10e64b124 /drivers/dma-buf/sync_debug.h | |
| parent | 3b52ce44e720c240afc4c4b03140d7b7811b23bd (diff) | |
| download | linux-d3862e44daa7a0c94d2f6193502a8c49379acfce.tar.xz | |
dma-buf/sw-sync: Fix locking around sync_timeline lists
The sync_pt were not adding themselves atomically to the timeline lists,
corruption imminent. Only a single list is required to track the
unsignaled sync_pt, so reduce it and rename the lock more appropriately
along with using idiomatic names to distinguish a list from links along
it.
v2: Prevent spinlock recursion on free during create (next patch) and
fixup crossref in kerneldoc
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170629210532.5617-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/dma-buf/sync_debug.h')
| -rw-r--r-- | drivers/dma-buf/sync_debug.h | 21 |
1 files changed, 8 insertions, 13 deletions
diff --git a/drivers/dma-buf/sync_debug.h b/drivers/dma-buf/sync_debug.h index 26fe8b9907b3..6a2a8e69a7d0 100644 --- a/drivers/dma-buf/sync_debug.h +++ b/drivers/dma-buf/sync_debug.h @@ -24,42 +24,37 @@ * struct sync_timeline - sync object * @kref: reference count on fence. * @name: name of the sync_timeline. Useful for debugging - * @child_list_head: list of children sync_pts for this sync_timeline - * @child_list_lock: lock protecting @child_list_head and fence.status - * @active_list_head: list of active (unsignaled/errored) sync_pts + * @lock: lock protecting @pt_list and @value + * @pt_list: list of active (unsignaled/errored) sync_pts * @sync_timeline_list: membership in global sync_timeline_list */ struct sync_timeline { struct kref kref; char name[32]; - /* protected by child_list_lock */ + /* protected by lock */ u64 context; int value; - struct list_head child_list_head; - spinlock_t child_list_lock; - - struct list_head active_list_head; + struct list_head pt_list; + spinlock_t lock; struct list_head sync_timeline_list; }; static inline struct sync_timeline *dma_fence_parent(struct dma_fence *fence) { - return container_of(fence->lock, struct sync_timeline, child_list_lock); + return container_of(fence->lock, struct sync_timeline, lock); } /** * struct sync_pt - sync_pt object * @base: base fence object - * @child_list: sync timeline child's list - * @active_list: sync timeline active child's list + * @link: link on the sync timeline's list */ struct sync_pt { struct dma_fence base; - struct list_head child_list; - struct list_head active_list; + struct list_head link; }; #ifdef CONFIG_SW_SYNC |