RDMA/cxgb3: Clean up properly on FW mismatch failures

FW mismatches can cause a crash in the iw_cxgb3 event handler.

- NULL the t3cdev->ulp pointer on failures in cxio_rdev_open()
- Silently ignore events when the ulp ptr is NULL in iwch_err_handler()

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/cxgb3/iwch.c b/drivers/infiniband/hw/cxgb3/iwch.c
index 5796170b0b2..3f0c99daae8 100644
--- a/drivers/infiniband/hw/cxgb3/iwch.c
+++ b/drivers/infiniband/hw/cxgb3/iwch.c
@@ -165,10 +165,13 @@ static void close_rnic_dev(struct t3cdev *tdev)
 static void iwch_event_handler(struct t3cdev *tdev, u32 evt, u32 port_id)
 {
 	struct cxio_rdev *rdev = tdev->ulp;
-	struct iwch_dev *rnicp = rdev_to_iwch_dev(rdev);
+	struct iwch_dev *rnicp;
 	struct ib_event event;
 	u32    portnum = port_id + 1;
 
+	if (!rdev)
+		return;
+	rnicp = rdev_to_iwch_dev(rdev);
 	switch (evt) {
 	case OFFLOAD_STATUS_DOWN: {
 		rdev->flags = CXIO_ERROR_FATAL;