[PATCH AUTOSEL for 4.9 115/219] IB/hfi1: Check for QSFP presence before attempting reads

Sasha Levin
2018-03-03T23:44:47Z

From: Easwar Hariharan <easwar.hariharan@intel.com>

[ Upstream commit fb897ad315643e5dc1092a115b3cec914b66df9d ]

Attempting to read the status of a QSFP cable creates noise in the logs
and misses out on setting an appropriate Offline/Disabled Reason if the
cable is not plugged in. Check for this prior to attempting the read and
attendant retries.

Fixes: 673b975f1fba ("IB/hfi1: Add QSFP sanity pre-check")
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
drivers/infiniband/hw/hfi1/chip.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c
index 4682909b021b..3be62ef154d1 100644
--- a/drivers/infiniband/hw/hfi1/chip.c
+++ b/drivers/infiniband/hw/hfi1/chip.c
@@ -9489,8 +9489,11 @@ static int test_qsfp_read(struct hfi1_pportdata *ppd)
int ret;
u8 status;

- /* report success if not a QSFP */
- if (ppd->port_type != PORT_TYPE_QSFP)
+ /*
+ * Report success if not a QSFP or, if it is a QSFP, but the cable is
+ * not present
+ */
+ if (ppd->port_type != PORT_TYPE_QSFP || !qsfp_mod_present(ppd))
return 0;

/* read byte 2, the status byte */
--
2.14.1