cifs: when a channel is not found for server, log its connection id

sprasad-microsoft · smfrench · commit 5d24968f5b7e · 2022-06-18T14:55:06.000-05:00
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 &lt;sprasad@microsoft.com&gt;
Signed-off-by: Steve French &lt;stfrench@microsoft.com&gt;
diff --git 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;
 }

Original file line number	Diff line number	Diff line change
`@@ -81,6 +81,9 @@ cifs_ses_get_chan_index(struct cifs_ses *ses,`
`81`	`81`	`}`
`82`	`82`
`83`	`83`	`/* If we didn't find the channel, it is likely a bug */`
	`84`	`+ if (server)`
	`85`	`+ cifs_dbg(VFS, "unable to get chan index for server: 0x%llx",`
	`86`	`+ server->conn_id);`
`84`	`87`	`WARN_ON(1);`
`85`	`88`	`return 0;`
`86`	`89`	`}`