IB/qib: Fix local access validation for user MRs

Commit 8aac4cc3a9d7 ("IB/qib: RCU locking for MR validation") introduced
a bug that broke user post sends.  The proper validation of the MR
was lost in the patch.

This patch corrects that validation.

Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/infiniband/hw/qib/qib_keys.c b/drivers/infiniband/hw/qib/qib_keys.c
index e9486c74c226..81c7b73695d2 100644
--- a/drivers/infiniband/hw/qib/qib_keys.c
+++ b/drivers/infiniband/hw/qib/qib_keys.c
@@ -186,8 +186,9 @@ int qib_lkey_ok(struct qib_lkey_table *rkt, struct qib_pd *pd,
                 goto bail;
 
         off = sge->addr - mr->user_base;
-        if (unlikely(sge->addr < mr->iova || off + sge->length > mr->length ||
-                     (mr->access_flags & acc) == 0))
+        if (unlikely(sge->addr < mr->user_base ||
+                     off + sge->length > mr->length ||
+                     (mr->access_flags & acc) != acc))
                 goto bail;
         if (unlikely(!atomic_inc_not_zero(&mr->refcount)))
                 goto bail;