From 1c980b010f06696c9093c5d6a5ac7b5145f89a04 Mon Sep 17 00:00:00 2001 From: Selvin Xavier Date: Mon, 22 May 2017 03:15:34 -0700 Subject: [PATCH] RDMA/bnxt_re: Dereg MR in FW before freeing the fast_reg_page_list If the host buffers are freed before destroying MR in HW, HW could try accessing these buffers. This could cause a host crash. Fixing the code to avoid this condition. Signed-off-by: Selvin Xavier Signed-off-by: Doug Ledford --- drivers/infiniband/hw/bnxt_re/ib_verbs.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c index 169798752895..d94b1b304135 100644 --- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c +++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c @@ -3052,6 +3052,12 @@ int bnxt_re_dereg_mr(struct ib_mr *ib_mr) struct bnxt_re_dev *rdev = mr->rdev; int rc; + rc = bnxt_qplib_free_mrw(&rdev->qplib_res, &mr->qplib_mr); + if (rc) { + dev_err(rdev_to_dev(rdev), "Dereg MR failed: %#x\n", rc); + return rc; + } + if (mr->npages && mr->pages) { rc = bnxt_qplib_free_fast_reg_page_list(&rdev->qplib_res, &mr->qplib_frpl); @@ -3059,8 +3065,6 @@ int bnxt_re_dereg_mr(struct ib_mr *ib_mr) mr->npages = 0; mr->pages = NULL; } - rc = bnxt_qplib_free_mrw(&rdev->qplib_res, &mr->qplib_mr); - if (!IS_ERR_OR_NULL(mr->ib_umem)) ib_umem_release(mr->ib_umem); -- 2.39.2