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authorChris Wilson <chris@chris-wilson.co.uk>2019-08-17 15:47:34 +0100
committerChris Wilson <chris@chris-wilson.co.uk>2019-08-17 18:03:00 +0100
commitf86a802bf3a7c28e4c4ea032fa2e61398dbccd5d (patch)
tree9461feb021ab3950edcb90efe4c2936f09c67bf0 /drivers/dma-buf
parent4fe3997a68f3300c73adc196ff33a952febe6974 (diff)
downloadlinux-f86a802bf3a7c28e4c4ea032fa2e61398dbccd5d.tar.bz2
dma-fence: Avoid list_del during fence->cb_list iteration
Before we notify the fence signal callback, we remove the cb from the list. However, since we are processing the entire list from underneath the spinlock, we do not need to individual delete each element, but can simply reset the link and the entire list. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Christian König <christian.koenig@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190817144736.7826-4-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/dma-buf')
-rw-r--r--drivers/dma-buf/dma-fence.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
index 8025a891d3e9..ff0cd6eae766 100644
--- a/drivers/dma-buf/dma-fence.c
+++ b/drivers/dma-buf/dma-fence.c
@@ -149,9 +149,12 @@ int dma_fence_signal_locked(struct dma_fence *fence)
trace_dma_fence_signaled(fence);
}
- list_for_each_entry_safe(cur, tmp, &fence->cb_list, node) {
- list_del_init(&cur->node);
- cur->func(fence, cur);
+ if (!list_empty(&fence->cb_list)) {
+ list_for_each_entry_safe(cur, tmp, &fence->cb_list, node) {
+ INIT_LIST_HEAD(&cur->node);
+ cur->func(fence, cur);
+ }
+ INIT_LIST_HEAD(&fence->cb_list);
}
return ret;
}