IB/ipath: Add locking for interrupt use of ipath_pd contexts vs free

Fixes timing race resulting in panic.  Not a performance sensitive path.

Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_keys.c b/drivers/infiniband/hw/ipath/ipath_keys.c
index 8f32b17a5eed..c0e933fec218 100644
--- a/drivers/infiniband/hw/ipath/ipath_keys.c
+++ b/drivers/infiniband/hw/ipath/ipath_keys.c
@@ -132,6 +132,7 @@ int ipath_lkey_ok(struct ipath_qp *qp, struct ipath_sge *isge,
          * (see ipath_get_dma_mr and ipath_dma.c).
          */
         if (sge->lkey == 0) {
+                /* always a kernel port, no locking needed */
                 struct ipath_pd *pd = to_ipd(qp->ibqp.pd);
 
                 if (pd->user) {
@@ -211,6 +212,7 @@ int ipath_rkey_ok(struct ipath_qp *qp, struct ipath_sge_state *ss,
          * (see ipath_get_dma_mr and ipath_dma.c).
          */
         if (rkey == 0) {
+                /* always a kernel port, no locking needed */
                 struct ipath_pd *pd = to_ipd(qp->ibqp.pd);
 
                 if (pd->user) {