[PATCH 16/19] staging: lustre: use explicit poll loop in ptlrpc_unregister_reply

[NeilBrown]

replace l_wait_event() with wait_event_idle_timeout() and explicit
loop.  This approach is easier to understand.

Reviewed-by: James Simmons <jsimm...@infradead.org>
Signed-off-by: NeilBrown <ne...@suse.com>
---
 drivers/staging/lustre/lustre/ptlrpc/client.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/lustre/lustre/ptlrpc/client.c 
b/drivers/staging/lustre/lustre/ptlrpc/client.c
index f70176c6db08..ffdd3ffd62c6 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/client.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/client.c
@@ -2500,7 +2500,6 @@ static int ptlrpc_unregister_reply(struct ptlrpc_request 
*request, int async)
 {
        int rc;
        wait_queue_head_t *wq;
-       struct l_wait_info lwi;
 
        /* Might sleep. */
        LASSERT(!in_interrupt());
@@ -2543,16 +2542,17 @@ static int ptlrpc_unregister_reply(struct 
ptlrpc_request *request, int async)
                 * Network access will complete in finite time but the HUGE
                 * timeout lets us CWARN for visibility of sluggish NALs
                 */
-               lwi = LWI_TIMEOUT_INTERVAL(LONG_UNLINK * HZ,
-                                          HZ, NULL, NULL);
-               rc = l_wait_event(*wq, !ptlrpc_client_recv_or_unlink(request),
-                                 &lwi);
-               if (rc == 0) {
+               int cnt = 0;
+               while (cnt < LONG_UNLINK &&
+                      (rc = wait_event_idle_timeout(*wq,
+                                                    
!ptlrpc_client_recv_or_unlink(request),
+                                                    HZ)) == 0)
+                       cnt += 1;
+               if (rc > 0) {
                        ptlrpc_rqphase_move(request, request->rq_next_phase);
                        return 1;
                }
 
-               LASSERT(rc == -ETIMEDOUT);
                DEBUG_REQ(D_WARNING, request,
                          "Unexpectedly long timeout receiving_reply=%d 
req_ulinked=%d reply_unlinked=%d",
                          request->rq_receiving_reply,