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_kernel.h b/drivers/infiniband/hw/ipath/ipath_kernel.h
index aa84153b731b..6ba4861dd6ac 100644
--- a/drivers/infiniband/hw/ipath/ipath_kernel.h
+++ b/drivers/infiniband/hw/ipath/ipath_kernel.h
@@ -477,6 +477,8 @@ struct ipath_devdata {
         spinlock_t ipath_kernel_tid_lock;
         spinlock_t ipath_user_tid_lock;
         spinlock_t ipath_sendctrl_lock;
+        /* around ipath_pd and (user ports) port_cnt use (intr vs free) */
+        spinlock_t ipath_uctxt_lock;
 
         /*
          * IPATH_STATUS_*,