linux-kernel - [PATCH 3/3] dax: Ensure errno is returned from dax_direct

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Message-Id: <20210525172428.3634316-4-ira.weiny@intel.com>
Date:   Tue, 25 May 2021 10:24:28 -0700
From:   ira.weiny@...el.com
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH 3/3] dax: Ensure errno is returned from dax_direct_access

From: Ira Weiny <ira.weiny@...el.com>

If the caller specifies a negative nr_pages that is an invalid
parameter.

Return -EINVAL to ensure callers get an errno if they want to check it.

Reviewed-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 drivers/dax/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 5fa6ae9dbc8b..44736cbd446e 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -313,7 +313,7 @@ long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages,
 		return -ENXIO;
 
 	if (nr_pages < 0)
-		return nr_pages;
+		return -EINVAL;
 
 	avail = dax_dev->ops->direct_access(dax_dev, pgoff, nr_pages,
 			kaddr, pfn);
-- 
2.28.0.rc0.12.gb6a658bd00c9