xprtrdma: Rename rpcrdma_req::rl_free

Clean up: I'm about to use the rl_free field for purposes other than
a free list. So use a more generic name.

This is a refactoring change only.

BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=305
Fixes: 68791649 ('xprtrdma: Invalidate in the RPC reply ... ')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/xprtrdma/verbs.c

@@ -971,7 +971,6 @@ rpcrdma_create_req(struct rpcrdma_xprt *r_xprt)
 	if (req == NULL)
 		return ERR_PTR(-ENOMEM);
 
-	INIT_LIST_HEAD(&req->rl_free);
 	spin_lock(&buffer->rb_reqslock);
 	list_add(&req->rl_all, &buffer->rb_allreqs);
 	spin_unlock(&buffer->rb_reqslock);
@@ -1055,7 +1054,7 @@ rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
 			goto out;
 		}
 		req->rl_backchannel = false;
-		list_add(&req->rl_free, &buf->rb_send_bufs);
+		list_add(&req->rl_list, &buf->rb_send_bufs);
 	}
 
 	INIT_LIST_HEAD(&buf->rb_recv_bufs);
@@ -1084,8 +1083,8 @@ rpcrdma_buffer_get_req_locked(struct rpcrdma_buffer *buf)
 	struct rpcrdma_req *req;
 
 	req = list_first_entry(&buf->rb_send_bufs,
-			       struct rpcrdma_req, rl_free);
-	list_del(&req->rl_free);
+			       struct rpcrdma_req, rl_list);
+	list_del(&req->rl_list);
 	return req;
 }
 
@@ -1268,7 +1267,7 @@ rpcrdma_buffer_put(struct rpcrdma_req *req)
 
 	spin_lock(&buffers->rb_lock);
 	buffers->rb_send_count--;
-	list_add_tail(&req->rl_free, &buffers->rb_send_bufs);
+	list_add_tail(&req->rl_list, &buffers->rb_send_bufs);
 	if (rep) {
 		buffers->rb_recv_count--;
 		list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);

net/sunrpc/xprtrdma/xprt_rdma.h

@@ -340,7 +340,7 @@ enum {
 
 struct rpcrdma_buffer;
 struct rpcrdma_req {
-	struct list_head	rl_free;
+	struct list_head	rl_list;
 	unsigned int		rl_mapped_sges;
 	unsigned int		rl_connect_cookie;
 	struct rpcrdma_buffer	*rl_buffer;