IB/hfi1: Ignore link downgrade with 0 lanes

Versions of the 8051 firmware < 0.38 may report a link failure
as a link downgrade with a width of 0 followed by a link down
notification.  Ignore the zero width downgrade notification -
the driver should follow the link down path.

Reviewed-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/staging/rdma/hfi1/chip.c b/drivers/staging/rdma/hfi1/chip.c
index 386309c67efd614182a350f09c232c6e8c6c1ec7..f50f1b132af9df083a554fa6827d4477351caa66 100644 (file)
--- a/drivers/staging/rdma/hfi1/chip.c
+++ b/drivers/staging/rdma/hfi1/chip.c
@@ -7336,7 +7336,11 @@ retry:
                ppd->link_width_downgrade_rx_active = rx;
        }
 
-       if (lwde == 0) {
+       if (ppd->link_width_downgrade_tx_active == 0 ||
+           ppd->link_width_downgrade_rx_active == 0) {
+               /* the 8051 reported a dead link as a downgrade */
+               dd_dev_err(ppd->dd, "Link downgrade is really a link down, ignoring\n");
+       } else if (lwde == 0) {
                /* downgrade is disabled */
 
                /* bounce if not at starting active width */