[PATCH net-next 6/7] net/smc: check port_idx of ib event

[Ursula Braun]

From: Karsten Graul <kgr...@linux.ibm.com>

For robustness protect of higher port numbers than expected to avoid
setting bits behind our port_event_mask. In case of an DEVICE_FATAL
event all ports must be checked. The IB_EVENT_GID_CHANGE event is
provided in the global event handler, so handle it there. And handle a
QP_FATAL event instead of an DEVICE_FATAL event in the qp handler.

Signed-off-by: Karsten Graul <kgr...@linux.ibm.com>
Signed-off-by: Ursula Braun <ubr...@linux.ibm.com>
---
 net/smc/smc_ib.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c
index 76487a16934e..0b244be24fe0 100644
--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -257,12 +257,20 @@ static void smc_ib_global_event_handler(struct 
ib_event_handler *handler,
        smcibdev = container_of(handler, struct smc_ib_device, event_handler);
 
        switch (ibevent->event) {
-       case IB_EVENT_PORT_ERR:
        case IB_EVENT_DEVICE_FATAL:
+               /* terminate all ports on device */
+               for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++)
+                       set_bit(port_idx, &smcibdev->port_event_mask);
+               schedule_work(&smcibdev->port_event_work);
+               break;
+       case IB_EVENT_PORT_ERR:
        case IB_EVENT_PORT_ACTIVE:
+       case IB_EVENT_GID_CHANGE:
                port_idx = ibevent->element.port_num - 1;
-               set_bit(port_idx, &smcibdev->port_event_mask);
-               schedule_work(&smcibdev->port_event_work);
+               if (port_idx < SMC_MAX_PORTS) {
+                       set_bit(port_idx, &smcibdev->port_event_mask);
+                       schedule_work(&smcibdev->port_event_work);
+               }
                break;
        default:
                break;
@@ -294,13 +302,13 @@ static void smc_ib_qp_event_handler(struct ib_event 
*ibevent, void *priv)
        u8 port_idx;
 
        switch (ibevent->event) {
-       case IB_EVENT_DEVICE_FATAL:
-       case IB_EVENT_GID_CHANGE:
-       case IB_EVENT_PORT_ERR:
+       case IB_EVENT_QP_FATAL:
        case IB_EVENT_QP_ACCESS_ERR:
                port_idx = ibevent->element.qp->port - 1;
-               set_bit(port_idx, &smcibdev->port_event_mask);
-               schedule_work(&smcibdev->port_event_work);
+               if (port_idx < SMC_MAX_PORTS) {
+                       set_bit(port_idx, &smcibdev->port_event_mask);
+                       schedule_work(&smcibdev->port_event_work);
+               }
                break;
        default:
                break;
-- 
2.16.4