IB/hfi1: Prevent link down request double queuing
When link interrupts occur, multiple link down requests
could be queued up when only one is needed. This could get
the hfi1 out of sync with its link partner during LNI.
Only allow one link down request to be queued at any one time.
Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c
index 8443d41..a3af46c 100644
--- a/drivers/infiniband/hw/hfi1/chip.c
+++ b/drivers/infiniband/hw/hfi1/chip.c
@@ -7045,6 +7045,7 @@ void handle_link_down(struct work_struct *work)
/* Go offline first, then deal with reading/writing through 8051 */
was_up = !!(ppd->host_link_state & HLS_UP);
set_link_state(ppd, HLS_DN_OFFLINE);
+ xchg(&ppd->is_link_down_queued, 0);
if (was_up) {
lcl_reason = 0;
@@ -7805,10 +7806,11 @@ static void handle_8051_interrupt(struct hfi1_devdata *dd, u32 unused, u64 reg)
*/
if ((ppd->host_link_state &
(HLS_GOING_OFFLINE | HLS_LINK_COOLDOWN)) ||
- ppd->link_enabled == 0) {
+ ppd->link_enabled == 0 || ppd->is_link_down_queued) {
dd_dev_info(dd, "%s: not queuing link down\n",
__func__);
} else {
+ xchg(&ppd->is_link_down_queued, 1);
queue_work(ppd->link_wq, &ppd->link_down_work);
}
}