From 5b88597ac6042df1a83d2af5bdffc7c6882b4420 Mon Sep 17 00:00:00 2001
From: Kozlowski Mateusz <mateusz.kozlowski@intel.com>
Date: Wed, 6 Nov 2019 09:54:47 -0500
Subject: [PATCH] bdev: Initialize md_buf for zero copy start request

In emulated zero copy mode on devices with separate metadata support
the start zero copy request could assert after read completion,
during _bdev_io_unset_bounce_buf; the original iovs would be NULL, but
original md_buf would have garbage data.

Signed-off-by: Kozlowski Mateusz <mateusz.kozlowski@intel.com>
Change-Id: Ia52b012c1b7462ebe490c29f5493168775646848
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/473455
Community-CI: Broadcom SPDK FC-NVMe CI <spdk-ci.pdl@broadcom.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
---
 lib/bdev/bdev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/bdev/bdev.c b/lib/bdev/bdev.c
index dc0572244..48e2c5441 100644
--- a/lib/bdev/bdev.c
+++ b/lib/bdev/bdev.c
@@ -3152,6 +3152,7 @@ spdk_bdev_zcopy_start(struct spdk_bdev_desc *desc, struct spdk_io_channel *ch,
 	bdev_io->u.bdev.offset_blocks = offset_blocks;
 	bdev_io->u.bdev.iovs = NULL;
 	bdev_io->u.bdev.iovcnt = 0;
+	bdev_io->u.bdev.md_buf = NULL;
 	bdev_io->u.bdev.zcopy.populate = populate ? 1 : 0;
 	bdev_io->u.bdev.zcopy.commit = 0;
 	bdev_io->u.bdev.zcopy.start = 1;