From 354dff1bd8ccd41b6e8421226d586d35e7fb8920 Mon Sep 17 00:00:00 2001 From: Mike Marciniszyn Date: Wed, 27 Jun 2012 18:33:05 -0400 Subject: [PATCH] IB/qib: Fix UC MR refs for immediate operations An MR reference leak exists when handling UC RDMA writes with immediate data because we manipulate the reference counts as if the operation had been a send. This patch moves the last_imm label so that the RDMA write operations with immediate data converge at the cq building code. The copy/mr deref code is now done correctly prior to the branch to last_imm. Reviewed-by: Edward Mascarenhas Signed-off-by: Mike Marciniszyn Signed-off-by: Roland Dreier --- drivers/infiniband/hw/qib/qib_uc.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/qib/qib_uc.c b/drivers/infiniband/hw/qib/qib_uc.c index ce7387f..70b4cb7 100644 --- a/drivers/infiniband/hw/qib/qib_uc.c +++ b/drivers/infiniband/hw/qib/qib_uc.c @@ -403,7 +403,6 @@ send_last: if (unlikely(wc.byte_len > qp->r_len)) goto rewind; wc.opcode = IB_WC_RECV; -last_imm: qib_copy_sge(&qp->r_sge, data, tlen, 0); while (qp->s_rdma_read_sge.num_sge) { atomic_dec(&qp->s_rdma_read_sge.sge.mr->refcount); @@ -411,6 +410,7 @@ last_imm: qp->s_rdma_read_sge.sge = *qp->s_rdma_read_sge.sg_list++; } +last_imm: wc.wr_id = qp->r_wr_id; wc.status = IB_WC_SUCCESS; wc.qp = &qp->ibqp; @@ -509,6 +509,12 @@ rdma_last_imm: } wc.byte_len = qp->r_len; wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; + qib_copy_sge(&qp->r_sge, data, tlen, 1); + while (qp->r_sge.num_sge) { + atomic_dec(&qp->r_sge.sge.mr->refcount); + if (--qp->r_sge.num_sge) + qp->r_sge.sge = *qp->r_sge.sg_list++; + } goto last_imm; case OP(RDMA_WRITE_LAST): -- 2.7.4