xprtrdma: Fix calculation of ri_max_segs again

Commit 302d3deb206 ("xprtrdma: Prevent inline overflow") added this
calculation back in 2016, but got it wrong. I tested only the lower
bound, which is why there is a max_t there. The upper bound should be
rounded up too.

Now, when using DIV_ROUND_UP, that takes care of the lower bound as
well.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index a30f2ae..3a10bff 100644 (file)
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -260,8 +260,8 @@ int frwr_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep)
        ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
        ep->rep_attr.cap.max_recv_wr += 1; /* for ib_drain_rq */
 
-       ia->ri_max_segs = max_t(unsigned int, 1, RPCRDMA_MAX_DATA_SEGS /
-                               ia->ri_max_frwr_depth);
+       ia->ri_max_segs =
+               DIV_ROUND_UP(RPCRDMA_MAX_DATA_SEGS, ia->ri_max_frwr_depth);
        /* Reply chunks require segments for head and tail buffers */
        ia->ri_max_segs += 2;
        if (ia->ri_max_segs > RPCRDMA_MAX_HDR_SEGS)