From 10feaff29901c7cc1ea4a3ff5277c064f17066e1 Mon Sep 17 00:00:00 2001
From: Jim Harris <james.r.harris@intel.com>
Date: Mon, 19 Apr 2021 11:51:51 -0700
Subject: [PATCH] nvme: only process io_msg in primary process

The io_msg qpair is allocated and managed by the
primary process, so don't try polling it from
secondary processes.

This fixes a bug where an SPDK target has configured
cuse, and we try to run fio (for example) as a
secondary process.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I48e2b89597196ce2ba1fc02ea3a7c76c5a33281a

Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7482
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: <dongx.yi@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
---
 lib/nvme/nvme_io_msg.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/nvme/nvme_io_msg.c b/lib/nvme/nvme_io_msg.c
index fb5aec3d4d..28aa3379ee 100644
--- a/lib/nvme/nvme_io_msg.c
+++ b/lib/nvme/nvme_io_msg.c
@@ -87,6 +87,10 @@ nvme_io_msg_process(struct spdk_nvme_ctrlr *ctrlr)
 		return 0;
 	}
 
+	if (!spdk_process_is_primary()) {
+		return 0;
+	}
+
 	spdk_nvme_qpair_process_completions(ctrlr->external_io_msgs_qpair, 0);
 
 	count = spdk_ring_dequeue(ctrlr->external_io_msgs, requests,