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