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xprtrdma: Clean up SGE accounting in rpcrdma_prepare_msg_sges()

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Clean up. rpcrdma_prepare_hdr_sge() sets num_sge to one, then
rpcrdma_prepare_msg_sges() sets num_sge again to the count of SGEs
it added, plus one for the header SGE just mapped in
rpcrdma_prepare_hdr_sge(). This is confusing, and nails in an
assumption about when these functions are called.

Instead, maintain a running count that both functions can update
with just the number of SGEs they have added to the SGE array.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2017-10-20 10:47:39 -04:00 committed by Anna Schumaker
parent be798f9082
commit ad99f05307
1 changed files with 1 additions and 1 deletions
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2
net/sunrpc/xprtrdma/rpc_rdma.c
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@ -637,7 +637,7 @@ map_tail:
}
out:
req->rl_send_wr.num_sge = sge_no + 1;
req->rl_send_wr.num_sge += sge_no;
return true;
out_mapping_overflow: