linux-kernel - [PATCH AUTOSEL 5.18 21/22] cifs: when a channel is not found for server, log its connection id

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Date:   Tue, 21 Jun 2022 16:49:27 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Shyam Prasad N <sprasad@...rosoft.com>,
        Steve French <stfrench@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>, sfrench@...ba.org,
        linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org
Subject: [PATCH AUTOSEL 5.18 21/22] cifs: when a channel is not found for server, log its connection id

From: Shyam Prasad N <sprasad@...rosoft.com>

[ Upstream commit 5d24968f5b7e00bae564b1646c3b9e0e3750aabe ]

cifs_ses_get_chan_index gets the index for a given server pointer.
When a match is not found, we warn about a possible bug.
However, printing details about the non-matching server could be
more useful to debug here.

Signed-off-by: Shyam Prasad N <sprasad@...rosoft.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/cifs/sess.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index 83b9047c945a..453ce8f52b8b 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -81,6 +81,9 @@ cifs_ses_get_chan_index(struct cifs_ses *ses,
 	}
 
 	/* If we didn't find the channel, it is likely a bug */
+	if (server)
+		cifs_dbg(VFS, "unable to get chan index for server: 0x%llx",
+			 server->conn_id);
 	WARN_ON(1);
 	return 0;
 }
-- 
2.35.1