SUNRPC: Prevent mixed sign comparisons in rpcrdma_convert_iovs()

Keep the type of the buffer position the same during iovec conversion to
reduce the likelihood of unexpected results from comparisons and length
computations.

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

diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 1aa1580..72c8eab 100644 (file)
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -83,7 +83,7 @@ static const char transfertypes[][12] = {
  */
 
 static int
-rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, int pos,
+rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, unsigned int pos,
        enum rpcrdma_chunktype type, struct rpcrdma_mr_seg *seg, int nsegs)
 {
        int len, n = 0, p;
@@ -169,7 +169,7 @@ rpcrdma_create_chunks(struct rpc_rqst *rqst, struct xdr_buf *target,
        struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
        struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_task->tk_xprt);
        int nsegs, nchunks = 0;
-       int pos;
+       unsigned int pos;
        struct rpcrdma_mr_seg *seg = req->rl_segments;
        struct rpcrdma_read_chunk *cur_rchunk = NULL;
        struct rpcrdma_write_array *warray = NULL;
@@ -213,7 +213,7 @@ rpcrdma_create_chunks(struct rpc_rqst *rqst, struct xdr_buf *target,
                                        (__be32 *)&cur_rchunk->rc_target.rs_offset,
                                        seg->mr_base);
                        dprintk("RPC:       %s: read chunk "
-                               "elem %d@0x%llx:0x%x pos %d (%s)\n", __func__,
+                               "elem %d@0x%llx:0x%x pos %u (%s)\n", __func__,
                                seg->mr_len, (unsigned long long)seg->mr_base,
                                seg->mr_rkey, pos, n < nsegs ? "more" : "last");
                        cur_rchunk++;