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Subject: [PATCH v2 12/21] xprtrdma: Combine rpcrdma_mr_put and
 rpcrdma_mr_unmap_and_put
From:   Chuck Lever <chuck.lever@oracle.com>
To:     anna.schumaker@netapp.com
Cc:     linux-nfs@vger.kernel.org, linux-rdma@vger.kernel.org
Date:   Mon, 19 Aug 2019 18:44:50 -0400
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Clean up. There is only one remaining rpcrdma_mr_put call site, and
it can be directly replaced with unmap_and_put because mr->mr_dir is
set to DMA_NONE just before the call.

Now all the call sites do a DMA unmap, and we can just rename
mr_unmap_and_put to mr_put, which nicely matches mr_get.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 net/sunrpc/xprtrdma/frwr_ops.c  |    6 +++---
 net/sunrpc/xprtrdma/verbs.c     |   32 ++++++++------------------------
 net/sunrpc/xprtrdma/xprt_rdma.h |    1 -
 3 files changed, 11 insertions(+), 28 deletions(-)

diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index d7e763fafa04..97e1804139b8 100644
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -129,7 +129,7 @@ void frwr_reset(struct rpcrdma_req *req)
 	struct rpcrdma_mr *mr;
 
 	while ((mr = rpcrdma_mr_pop(&req->rl_registered)))
-		rpcrdma_mr_unmap_and_put(mr);
+		rpcrdma_mr_put(mr);
 }
 
 /**
@@ -453,7 +453,7 @@ void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs)
 		if (mr->mr_handle == rep->rr_inv_rkey) {
 			list_del_init(&mr->mr_list);
 			trace_xprtrdma_mr_remoteinv(mr);
-			rpcrdma_mr_unmap_and_put(mr);
+			rpcrdma_mr_put(mr);
 			break;	/* only one invalidated MR per RPC */
 		}
 }
@@ -463,7 +463,7 @@ static void __frwr_release_mr(struct ib_wc *wc, struct rpcrdma_mr *mr)
 	if (wc->status != IB_WC_SUCCESS)
 		rpcrdma_mr_recycle(mr);
 	else
-		rpcrdma_mr_unmap_and_put(mr);
+		rpcrdma_mr_put(mr);
 }
 
 /**
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index ee6fcf10425b..5e0b774ed522 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1233,34 +1233,15 @@ rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt)
 	return NULL;
 }
 
-static void
-__rpcrdma_mr_put(struct rpcrdma_buffer *buf, struct rpcrdma_mr *mr)
-{
-	spin_lock(&buf->rb_mrlock);
-	rpcrdma_mr_push(mr, &buf->rb_mrs);
-	spin_unlock(&buf->rb_mrlock);
-}
-
-/**
- * rpcrdma_mr_put - Release an rpcrdma_mr object
- * @mr: object to release
- *
- */
-void
-rpcrdma_mr_put(struct rpcrdma_mr *mr)
-{
-	__rpcrdma_mr_put(&mr->mr_xprt->rx_buf, mr);
-}
-
 /**
- * rpcrdma_mr_unmap_and_put - DMA unmap an MR and release it
- * @mr: object to release
+ * rpcrdma_mr_put - DMA unmap an MR and release it
+ * @mr: MR to release
  *
  */
-void
-rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr)
+void rpcrdma_mr_put(struct rpcrdma_mr *mr)
 {
 	struct rpcrdma_xprt *r_xprt = mr->mr_xprt;
+	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
 
 	if (mr->mr_dir != DMA_NONE) {
 		trace_xprtrdma_mr_unmap(mr);
@@ -1268,7 +1249,10 @@ rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr)
 				mr->mr_sg, mr->mr_nents, mr->mr_dir);
 		mr->mr_dir = DMA_NONE;
 	}
-	__rpcrdma_mr_put(&r_xprt->rx_buf, mr);
+
+	spin_lock(&buf->rb_mrlock);
+	rpcrdma_mr_push(mr, &buf->rb_mrs);
+	spin_unlock(&buf->rb_mrlock);
 }
 
 /**
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index 9663b8ddd733..3e0839c2cda2 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -485,7 +485,6 @@ struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt);
 
 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt);
 void rpcrdma_mr_put(struct rpcrdma_mr *mr);
-void rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr);
 
 static inline void
 rpcrdma_mr_recycle(struct rpcrdma_mr *mr)