[PATCH] 9p/xen: Fix end of loop tests for list_for_each_entry

From: Harshvardhan Jha <harshvardhan.jha@oracle.com>
To: ericvh@gmail.com
Cc: lucho@ionkov.net, asmadeus@codewreck.org, davem@davemloft.net,
	kuba@kernel.org, v9fs-developer@lists.sourceforge.net,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	Harshvardhan Jha <harshvardhan.jha@oracle.com>
Subject: [PATCH] 9p/xen: Fix end of loop tests for list_for_each_entry
Date: Sun, 25 Jul 2021 23:21:03 +0530	[thread overview]
Message-ID: <20210725175103.56731-1-harshvardhan.jha@oracle.com> (raw)

The list_for_each_entry() iterator, "priv" in this code, can never be
NULL so the warning would never be printed.

Signed-off-by: Harshvardhan Jha <harshvardhan.jha@oracle.com>
---
From static analysis.  Not tested.
---
 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 f4fea28e05da..3ec1a51a6944 100644
--- a/net/9p/trans_xen.c
+++ b/net/9p/trans_xen.c
@@ -138,7 +138,7 @@ static bool p9_xen_write_todo(struct xen_9pfs_dataring *ring, RING_IDX size)
 
 static int p9_xen_request(struct p9_client *client, struct p9_req_t *p9_req)
 {
-	struct xen_9pfs_front_priv *priv = NULL;
+	struct xen_9pfs_front_priv *priv;
 	RING_IDX cons, prod, masked_cons, masked_prod;
 	unsigned long flags;
 	u32 size = p9_req->tc.size;
@@ -151,7 +151,7 @@ static int p9_xen_request(struct p9_client *client, struct p9_req_t *p9_req)
 			break;
 	}
 	read_unlock(&xen_9pfs_lock);
-	if (!priv || priv->client != client)
+	if (list_entry_is_head(priv, &xen_9pfs_devs, list))
 		return -EINVAL;
 
 	num = p9_req->tc.tag % priv->num_rings;
-- 
2.32.0

