diff mbox

staging/rdma/hfi1: Eliminate WARN_ON when VL is invalid

Message ID 1446768536-14207-1-git-send-email-jubin.john@intel.com (mailing list archive)
State Not Applicable
Headers show

Commit Message

jubin.john@intel.com Nov. 6, 2015, 12:08 a.m. UTC 
From: Ira Weiny <iweiny@gmail.com>

sdma_select_engine_vl only needs to protect itself from an invalid VL.
Something higher up the stack should be warning the user when they try
to use an SL which maps to an invalid VL.

Reviewed-by: Dean Luick <dean.luick@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Ira Weiny <iweiny@gmail.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
---
 drivers/staging/rdma/hfi1/sdma.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/drivers/staging/rdma/hfi1/sdma.c b/drivers/staging/rdma/hfi1/sdma.c
index 2a1da21..998bf43 100644
--- a/drivers/staging/rdma/hfi1/sdma.c
+++ b/drivers/staging/rdma/hfi1/sdma.c
@@ -777,8 +777,14 @@  struct sdma_engine *sdma_select_engine_vl(
 	struct sdma_map_elem *e;
 	struct sdma_engine *rval;
 
-	if (WARN_ON(vl > 8))
-		return NULL;
+	/* NOTE This should only happen if SC->VL changed after the initial
+	 *      checks on the QP/AH
+	 *      Default will return engine 0 below
+	 */
+	if (unlikely(vl >= num_vls)) {
+		rval = NULL;
+		goto done;
+	}
 
 	rcu_read_lock();
 	m = rcu_dereference(dd->sdma_map);
@@ -790,6 +796,8 @@  struct sdma_engine *sdma_select_engine_vl(
 	rval = e->sde[selector & e->mask];
 	rcu_read_unlock();
 
+done:
+	rval =  !rval ? &dd->per_sdma[0] : rval;
 	trace_hfi1_sdma_engine_select(dd, selector, vl, rval->this_idx);
 	return rval;
 }