forgot to add patch
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From patchwork Mon Jan 22 20:00:03 2018
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit
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Subject: dma-buf: fix reservation_object_wait_timeout_rcu once more v2
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From: =?UTF-8?q?Christian=20K=C3=B6nig?= <ckoenig.leichtzumerken@gmail.com>
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X-Patchwork-Id: 199865
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Message-Id: <20180122200003.6665-1-christian.koenig@amd.com>
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To: dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, lyude@redhat.com
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Date: Mon, 22 Jan 2018 21:00:03 +0100
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We need to set shared_count even if we already have a fence to wait for.
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v2: init i to -1 as well
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Signed-off-by: Christian König <christian.koenig@amd.com>
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Cc: stable@vger.kernel.org
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Tested-by: Lyude Paul <lyude@redhat.com>
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Reviewed-by: Lyude Paul <lyude@redhat.com>
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Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
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---
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drivers/dma-buf/reservation.c | 8 +++++---
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1 file changed, 5 insertions(+), 3 deletions(-)
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diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c
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index 461afa9febd4..314eb1071cce 100644
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--- a/drivers/dma-buf/reservation.c
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+++ b/drivers/dma-buf/reservation.c
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@@ -484,13 +484,15 @@ long reservation_object_wait_timeout_rcu(struct reservation_object *obj,
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unsigned long timeout)
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{
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struct dma_fence *fence;
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- unsigned seq, shared_count, i = 0;
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+ unsigned seq, shared_count;
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long ret = timeout ? timeout : 1;
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+ int i;
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retry:
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shared_count = 0;
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seq = read_seqcount_begin(&obj->seq);
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rcu_read_lock();
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+ i = -1;
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fence = rcu_dereference(obj->fence_excl);
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if (fence && !test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) {
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@@ -506,14 +508,14 @@ long reservation_object_wait_timeout_rcu(struct reservation_object *obj,
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fence = NULL;
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}
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- if (!fence && wait_all) {
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+ if (wait_all) {
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struct reservation_object_list *fobj =
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rcu_dereference(obj->fence);
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if (fobj)
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shared_count = fobj->shared_count;
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- for (i = 0; i < shared_count; ++i) {
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+ for (i = 0; !fence && i < shared_count; ++i) {
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struct dma_fence *lfence = rcu_dereference(fobj->shared[i]);
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if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
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