SUNRPC: Clean up svc_find_xprt() calling sequence

Clean up: add documentating comment and use appropriate data types for
svc_find_xprt()'s arguments.

This also eliminates a mixed sign comparison: @port was an int, while
the return value of svc_xprt_local_port() is an unsigned short.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 11 insertions, 5 deletions

diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index e588df5d6b34..c947c93dbc24 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -1033,7 +1033,13 @@ static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt)
         return dr;
 }
 
-/*
+/**
+ * svc_find_xprt - find an RPC transport instance
+ * @serv: pointer to svc_serv to search
+ * @xcl_name: C string containing transport's class name
+ * @af: Address family of transport's local address
+ * @port: transport's IP port number
+ *
  * Return the transport instance pointer for the endpoint accepting
  * connections/peer traffic from the specified transport class,
  * address family and port.
@@ -1042,14 +1048,14 @@ static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt)
  * wild-card, and will result in matching the first transport in the
  * service's list that has a matching class name.
  */
-struct svc_xprt *svc_find_xprt(struct svc_serv *serv, char *xcl_name,
-                               int af, int port)
+struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
+                               const sa_family_t af, const unsigned short port)
 {
         struct svc_xprt *xprt;
         struct svc_xprt *found = NULL;
 
         /* Sanity check the args */
-        if (!serv || !xcl_name)
+        if (serv == NULL || xcl_name == NULL)
                 return found;
 
         spin_lock_bh(&serv->sv_lock);
@@ -1058,7 +1064,7 @@ struct svc_xprt *svc_find_xprt(struct svc_serv *serv, char *xcl_name,
                         continue;
                 if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family)
                         continue;
-                if (port && port != svc_xprt_local_port(xprt))
+                if (port != 0 && port != svc_xprt_local_port(xprt))
                         continue;
                 found = xprt;
                 svc_xprt_get(xprt);