[git patch review 4/5] [IB] mthca: Avoid SRQ free WQE list corruption

[Roland Dreier <rolandd@cisco.com>]

Fix wqe_to_link() to use a structure field that we know is definitely
always unused for receive work requests, so that it really avoids the
free list corruption bug that the comment claims it does.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

---

 drivers/infiniband/hw/mthca/mthca_srq.c |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)

applies-to: ffd7eba03f29dd2932dd32ac4adc2921bde7644b
e5b251a24a9cd34a7ef98e361eb94e7ab122a554
diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c
index 64f70aa..292f55b 100644
--- a/drivers/infiniband/hw/mthca/mthca_srq.c
+++ b/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -75,15 +75,16 @@ static void *get_wqe(struct mthca_srq *s
 
 /*
  * Return a pointer to the location within a WQE that we're using as a
- * link when the WQE is in the free list.  We use an offset of 4
- * because in the Tavor case, posting a WQE may overwrite the first
- * four bytes of the previous WQE.  The offset avoids corrupting our
- * free list if the WQE has already completed and been put on the free
- * list when we post the next WQE.
+ * link when the WQE is in the free list.  We use the imm field
+ * because in the Tavor case, posting a WQE may overwrite the next
+ * segment of the previous WQE, but a receive WQE will never touch the
+ * imm field.  This avoids corrupting our free list if the previous
+ * WQE has already completed and been put on the free list when we
+ * post the next WQE.
  */
 static inline int *wqe_to_link(void *wqe)
 {
-	return (int *) (wqe + 4);
+	return (int *) (wqe + offsetof(struct mthca_next_seg, imm));
 }
 
 static void mthca_tavor_init_srq_context(struct mthca_dev *dev,
---
0.99.9