dma-buf/sw-sync: Fix the is-signaled test to handle u32 wraparound

commit 61894b02716f122dd7662d5d89f5b2245ca551e2 upstream.

Use the canonical __dma_fence_is_later() to compare the fence seqno
against the timeline seqno to check if the fence is signaled.

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/20170629125930.821-2-chris@chris-wilson.co.uk
[s/dma_fence/fence/g - gregkh]
Cc: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c
index 62e8e6d..77ede2a 100644 (file)
--- a/drivers/dma-buf/sw_sync.c
+++ b/drivers/dma-buf/sw_sync.c
@@ -219,7 +219,7 @@ static bool timeline_fence_signaled(struct fence *fence)
 {
        struct sync_timeline *parent = fence_parent(fence);
 
-       return (fence->seqno > parent->value) ? false : true;
+       return !__fence_is_later(fence->seqno, parent->value);
 }
 
 static bool timeline_fence_enable_signaling(struct fence *fence)