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nvme: Don't do a write memory barrier if we don't ring the doorbell

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Change-Id: I6766ae96c155e04bc0162aa8d2e21fd096be3221
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/448310
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
This commit is contained in:
Ben Walker 2019-03-18 11:23:21 -07:00
parent 4608e917de
commit b63ad2eec0
1 changed files with 1 additions and 1 deletions
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2
lib/nvme/nvme_pcie.c
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@ -1195,11 +1195,11 @@ nvme_pcie_qpair_submit_tracker(struct spdk_nvme_qpair *qpair, struct nvme_tracke
SPDK_ERRLOG("sq_tail is passing sq_head!\n");
}
spdk_wmb();
if (spdk_likely(nvme_pcie_qpair_update_mmio_required(qpair,
pqpair->sq_tail,
pqpair->sq_shadow_tdbl,
pqpair->sq_eventidx))) {
spdk_wmb();
g_thread_mmio_ctrlr = pctrlr;
spdk_mmio_write_4(pqpair->sq_tdbl, pqpair->sq_tail);
g_thread_mmio_ctrlr = NULL;