linux-kernel - [PATCH 5.11 520/775] device-dax: Fix default return code of range

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Message-Id: <20210301161227.222066572@linuxfoundation.org>
Date:   Mon,  1 Mar 2021 17:11:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shiyang Ruan <ruansy.fnst@...fujitsu.com>,
        Joao Martins <joao.m.martins@...cle.com>,
        Zhang Qilong <zhangqilong3@...wei.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 520/775] device-dax: Fix default return code of range_parse()

From: Shiyang Ruan <ruansy.fnst@...fujitsu.com>

[ Upstream commit 7323fb22f05ff1d20498d267828870a5fbbaebd6 ]

The return value of range_parse() indicates the size when it is
positive.  The error code should be negative.

Signed-off-by: Shiyang Ruan <ruansy.fnst@...fujitsu.com>
Reviewed-by: Joao Martins <joao.m.martins@...cle.com>
Link: https://lore.kernel.org/r/20210126021331.1059933-1-ruansy.fnst@cn.fujitsu.com
Reported-by: Zhang Qilong <zhangqilong3@...wei.com>
Fixes: 8490e2e25b5a ("device-dax: add a range mapping allocation attribute")
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/dax/bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index 737b207c9e30d..3003558c1a8bb 100644
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -1038,7 +1038,7 @@ static ssize_t range_parse(const char *opt, size_t len, struct range *range)
 {
 	unsigned long long addr = 0;
 	char *start, *end, *str;
-	ssize_t rc = EINVAL;
+	ssize_t rc = -EINVAL;
 
 	str = kstrdup(opt, GFP_KERNEL);
 	if (!str)
-- 
2.27.0