clear-pkgs-linux-iot-lts2018/0544-VBS-K-fix-a-bug-due-to-incorrect-check-of-return-val.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jian Jun Chen <jian.jun.chen@intel.com>
Date: Fri, 31 Aug 2018 10:59:03 +0800
Subject: [PATCH] VBS-K: fix a bug due to incorrect check of return value of
 bitmap_empty

When no bits are set in ioreqs_map, bitmap_empty returns 1. In this case
we can just return 0 since no virtqueues are kicked.

Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com>
Reviewed-by: Shuo Liu <shuo.a.liu@intel.com>
Reviewed-by: Yu Wang <yu1.wang@intel.com>
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
---
 drivers/vbs/vbs_rng.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/vbs/vbs_rng.c b/drivers/vbs/vbs_rng.c
index 45e17b086c29..fd2bb27af66e 100644
--- a/drivers/vbs/vbs_rng.c
+++ b/drivers/vbs/vbs_rng.c
@@ -256,8 +256,8 @@ static int handle_kick(int client_id, unsigned long *ioreqs_map)
 	int val = -1;
 	struct vbs_rng *rng;
 
-	if (unlikely(bitmap_empty(ioreqs_map, VHM_REQUEST_MAX) <= 0))
-		return -EINVAL;
+	if (unlikely(bitmap_empty(ioreqs_map, VHM_REQUEST_MAX)))
+		return 0;
 
 	pr_debug("%s: handle kick!\n", __func__);
 
-- 
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