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svcrdma: Shrink scope of spinlock on RQ CQ 

The rq_cq_reap function is only called from the dto_tasklet. The
only resource shared with other threads is the sc_rq_dto_q. Move the
spin lock to protect only this list.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
This commit is contained in:
Tom Tucker 2008-05-06 11:49:05 -05:00
parent 8740767376
commit 47698e083e
1 changed files with 2 additions and 2 deletions
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4
net/sunrpc/xprtrdma/svc_rdma_transport.c
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@ -292,7 +292,6 @@ static void rq_cq_reap(struct svcxprt_rdma *xprt)
ib_req_notify_cq(xprt->sc_rq_cq, IB_CQ_NEXT_COMP); ib_req_notify_cq(xprt->sc_rq_cq, IB_CQ_NEXT_COMP);
atomic_inc(&rdma_stat_rq_poll); atomic_inc(&rdma_stat_rq_poll);
spin_lock_bh(&xprt->sc_rq_dto_lock);
while ((ret = ib_poll_cq(xprt->sc_rq_cq, 1, &wc)) > 0) { while ((ret = ib_poll_cq(xprt->sc_rq_cq, 1, &wc)) > 0) {
ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id; ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id;
ctxt->wc_status = wc.status; ctxt->wc_status = wc.status;
@ -303,9 +302,10 @@ static void rq_cq_reap(struct svcxprt_rdma *xprt)
svc_rdma_put_context(ctxt, 1); svc_rdma_put_context(ctxt, 1);
continue; continue;
} }
spin_lock_bh(&xprt->sc_rq_dto_lock);
list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q); list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q);
spin_unlock_bh(&xprt->sc_rq_dto_lock);
} }
spin_unlock_bh(&xprt->sc_rq_dto_lock);
if (ctxt) if (ctxt)
atomic_inc(&rdma_stat_rq_prod); atomic_inc(&rdma_stat_rq_prod);