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authorRoland Dreier <roland@eddore.topspincom.com>2005-07-27 14:38:49 -0700
committerRoland Dreier <roland@eddore.topspincom.com>2005-07-27 14:38:49 -0700
commit42b1806d5cfc93bf8c3d7fa6e9e79e4ec860c678 (patch)
treee12240b90a87a22edf0846e1939254d6ae085737 /drivers/infiniband/hw
parent9e566d8bd61f939b7f5d7d969f5b178571471cf9 (diff)
[IB/mthca]: Fix error CQ entry handling on mem-free HCAs
Fix handling of error CQ entries on mem-free HCAs: the doorbell count is never valid so we shouldn't look at it. This fixes problems exposed by new HCA firmware. Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw')
-rw-r--r--drivers/infiniband/hw/mthca/mthca_cq.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_cq.c b/drivers/infiniband/hw/mthca/mthca_cq.c
index b5aea7b869f..5687c301452 100644
--- a/drivers/infiniband/hw/mthca/mthca_cq.c
+++ b/drivers/infiniband/hw/mthca/mthca_cq.c
@@ -373,8 +373,12 @@ static int handle_error_cqe(struct mthca_dev *dev, struct mthca_cq *cq,
* If we're at the end of the WQE chain, or we've used up our
* doorbell count, free the CQE. Otherwise just update it for
* the next poll operation.
+ *
+ * This does not apply to mem-free HCAs: they don't use the
+ * doorbell count field, and so we should always free the CQE.
*/
- if (!(new_wqe & cpu_to_be32(0x3f)) || (!cqe->db_cnt && dbd))
+ if (mthca_is_memfree(dev) ||
+ !(new_wqe & cpu_to_be32(0x3f)) || (!cqe->db_cnt && dbd))
return 0;
cqe->db_cnt = cpu_to_be16(be16_to_cpu(cqe->db_cnt) - dbd);