IB/rdmavt: Correct qp_priv_alloc() return value test

The current drivers return errors from this calldown
wrapped in an ERR_PTR().

The rdmavt code incorrectly tests for NULL.

The code is fixed to use IS_ERR() and change ret according
to the driver return value.

Cc: Stable <stable@vger.kernel.org> # 4.6+
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/sw/rdmavt/qp.c b/drivers/infiniband/sw/rdmavt/qp.c
index d04f4fe..41ba7e9 100644 (file)
--- a/drivers/infiniband/sw/rdmavt/qp.c
+++ b/drivers/infiniband/sw/rdmavt/qp.c
@@ -699,8 +699,10 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd,
                 * initialization that is needed.
                 */
                priv = rdi->driver_f.qp_priv_alloc(rdi, qp, gfp);
-               if (!priv)
+               if (IS_ERR(priv)) {
+                       ret = priv;
                        goto bail_qp;
+               }
                qp->priv = priv;
                qp->timeout_jiffies =
                        usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /

diff --git a/include/rdma/rdma_vt.h b/include/rdma/rdma_vt.h
index 16274e2..9c9a27d 100644 (file)
--- a/include/rdma/rdma_vt.h
+++ b/include/rdma/rdma_vt.h
@@ -203,7 +203,9 @@ struct rvt_driver_provided {
 
        /*
         * Allocate a private queue pair data structure for driver specific
-        * information which is opaque to rdmavt.
+        * information which is opaque to rdmavt.  Errors are returned via
+        * ERR_PTR(err).  The driver is free to return NULL or a valid
+        * pointer.
         */
        void * (*qp_priv_alloc)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
                                gfp_t gfp);