diff options
author | Nicolas Saenz Julienne <nsaenzjulienne@suse.de> | 2018-11-20 15:53:47 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-27 10:13:37 +0100 |
commit | 96f33712725e93677b2a91b68d93548068fb5c98 (patch) | |
tree | f2b963e5dc1b37fa53de745a0ef0730de6b10271 /drivers/staging | |
parent | f27e47bc6b8b96dd34ebad2a659b8a983cf367df (diff) |
staging: vchiq_util: get rid of unneeded memory barriers
All the memory operations featured in this file modify/access memory
that is only accessed by the CPU. So we can assume that all the memory
barrier handling done by the completion routines is good enough for us.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
-rw-r--r-- | drivers/staging/vc04_services/interface/vchiq_arm/vchiq_util.c | 32 |
1 files changed, 0 insertions, 32 deletions
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_util.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_util.c index 44b954daa74a..4b8554bc647e 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_util.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_util.c @@ -84,20 +84,7 @@ void vchiu_queue_push(VCHIU_QUEUE_T *queue, VCHIQ_HEADER_T *header) flush_signals(current); } - /* - * Write to queue->storage must be visible after read from - * queue->read - */ - smp_mb(); - queue->storage[queue->write & (queue->size - 1)] = header; - - /* - * Write to queue->storage must be visible before write to - * queue->write - */ - smp_wmb(); - queue->write++; complete(&queue->push); @@ -112,12 +99,6 @@ VCHIQ_HEADER_T *vchiu_queue_peek(VCHIU_QUEUE_T *queue) complete(&queue->push); // We haven't removed anything from the queue. - /* - * Read from queue->storage must be visible after read from - * queue->write - */ - smp_rmb(); - return queue->storage[queue->read & (queue->size - 1)]; } @@ -130,20 +111,7 @@ VCHIQ_HEADER_T *vchiu_queue_pop(VCHIU_QUEUE_T *queue) flush_signals(current); } - /* - * Read from queue->storage must be visible after read from - * queue->write - */ - smp_rmb(); - header = queue->storage[queue->read & (queue->size - 1)]; - - /* - * Read from queue->storage must be visible before write to - * queue->read - */ - smp_mb(); - queue->read++; complete(&queue->pop); |