netdev - [PATCH] xen/9pfs: fix return value check in xen_9pfs_front

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Message-Id: <20170516142247.12301-1-weiyj.lk@gmail.com>
Date:   Tue, 16 May 2017 14:22:47 +0000
From:   Wei Yongjun <weiyj.lk@...il.com>
To:     Eric Van Hensbergen <ericvh@...il.com>,
        Ron Minnich <rminnich@...dia.gov>,
        Latchesar Ionkov <lucho@...kov.net>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Juergen Gross <jgross@...e.com>
Cc:     Wei Yongjun <weiyongjun1@...wei.com>,
        v9fs-developer@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: [PATCH] xen/9pfs: fix return value check in xen_9pfs_front_probe()

From: Wei Yongjun <weiyongjun1@...wei.com>

In case of error, the function xenbus_read() returns ERR_PTR() and never
returns NULL. The NULL test in the return value check should be replaced
with IS_ERR().

Fixes: 71ebd71921e4 ("xen/9pfs: connect to the backend")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 net/9p/trans_xen.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c
index 71e8564..83fe487 100644
--- a/net/9p/trans_xen.c
+++ b/net/9p/trans_xen.c
@@ -454,8 +454,8 @@ static int xen_9pfs_front_probe(struct xenbus_device *dev,
 			goto error_xenbus;
 	}
 	priv->tag = xenbus_read(xbt, dev->nodename, "tag", NULL);
-	if (!priv->tag) {
-		ret = -EINVAL;
+	if (IS_ERR(priv->tag)) {
+		ret = PTR_ERR(priv->tag);
 		goto error_xenbus;
 	}
 	ret = xenbus_transaction_end(xbt, 0);