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[V3,for-next,04/15] RDMA/bnxt_re: Dereg MR in FW before freeing the fast_reg_page_list

Message ID 1495169074-12641-5-git-send-email-selvin.xavier@broadcom.com (mailing list archive)
State Superseded
Headers show

Commit Message

Selvin Xavier May 19, 2017, 4:44 a.m. UTC 
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 <selvin.xavier@broadcom.com>
---
 drivers/infiniband/hw/bnxt_re/ib_verbs.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
index a89f095..e91bd68 100644
--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
+++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
@@ -3035,6 +3035,12 @@  int bnxt_re_dereg_mr(struct ib_mr *ib_mr)
 	struct bnxt_re_dev *rdev = mr->rdev;
 	int rc = 0;
 
+	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);
@@ -3042,8 +3048,6 @@  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(mr->ib_umem) && mr->ib_umem)
 		ib_umem_release(mr->ib_umem);