[PATCH-for-5.2 v2 24/25] block/nvme: Fix nvme_submit_command() on big-endian host

[Philippe Mathieu-Daudé]

The Completion Queue Command Identifier is a 16-bit value,
so nvme_submit_command() is unlikely to work on big-endian
hosts, as the relevant bits are truncated.
Fix by using the correct byte-swap function.

Fixes: bdd6a90a9e5 ("block: Add VFIO based NVMe driver")
Reported-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 block/nvme.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/nvme.c b/block/nvme.c
index c8ef69cbb28..a06a188d530 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -469,7 +469,7 @@ static void nvme_submit_command(NVMeQueuePair *q, 
NVMeRequest *req,
     assert(!req->cb);
     req->cb = cb;
     req->opaque = opaque;
-    cmd->cid = cpu_to_le32(req->cid);
+    cmd->cid = cpu_to_le16(req->cid);
 
     trace_nvme_submit_command(q->s, q->index, req->cid);
     nvme_trace_command(cmd);
-- 
2.26.2