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- Log ----------------------------------------------------------------- commit 7ba232f77c60f707d279478a798f6ea14fe9c143 Author: Brian Brooks brian.brooks@linaro.org Date: Tue Mar 21 23:54:17 2017 -0500

linux-gen: ring: fix memory ordering in ring dequeue

Acquire ordering is needed to maintain proper release consistency with the ring enqueue operation. This issue presented itself as deadlock when running on an ARM-based chip.

Signed-off-by: Brian Brooks brian.brooks@linaro.org Reviewed-by: Bill Fischofer bill.fischofer@linaro.org Signed-off-by: Maxim Uvarov maxim.uvarov@linaro.org

diff --git a/platform/linux-generic/include/odp_ring_internal.h b/platform/linux-generic/include/odp_ring_internal.h index 55fedeb..44b83c6 100644 --- a/platform/linux-generic/include/odp_ring_internal.h +++ b/platform/linux-generic/include/odp_ring_internal.h @@ -57,7 +57,7 @@ static inline uint32_t ring_deq(ring_t *ring, uint32_t mask)

/* Move reader head. This thread owns data at the new head. */ do { - tail = odp_atomic_load_u32(&ring->w_tail); + tail = odp_atomic_load_acq_u32(&ring->w_tail);

if (head == tail) return RING_EMPTY; @@ -90,7 +90,7 @@ static inline uint32_t ring_deq_multi(ring_t *ring, uint32_t mask,

/* Move reader head. This thread owns data at the new head. */ do { - tail = odp_atomic_load_u32(&ring->w_tail); + tail = odp_atomic_load_acq_u32(&ring->w_tail);

/* Ring is empty */ if (head == tail)

-----------------------------------------------------------------------

Summary of changes: platform/linux-generic/include/odp_ring_internal.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

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