From 626c077c025f9da6dce809b5a8300ed44ef02b6f Mon Sep 17 00:00:00 2001 From: Sebastian Sanchez Date: Sat, 29 Jul 2017 08:43:55 -0700 Subject: [PATCH] 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 Signed-off-by: Sebastian Sanchez Signed-off-by: Dennis Dalessandro Signed-off-by: Doug Ledford --- drivers/infiniband/hw/hfi1/chip.c | 4 +++- drivers/infiniband/hw/hfi1/hfi.h | 1 + 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c index 8443d41c6e35..a3af46cbbf8d 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); } } diff --git a/drivers/infiniband/hw/hfi1/hfi.h b/drivers/infiniband/hw/hfi1/hfi.h index ee6c389f9515..fb5f8394fbed 100644 --- a/drivers/infiniband/hw/hfi1/hfi.h +++ b/drivers/infiniband/hw/hfi1/hfi.h @@ -644,6 +644,7 @@ struct hfi1_pportdata { /* placeholders for IB MAD packet settings */ u8 overrun_threshold; u8 phy_error_threshold; + unsigned int is_link_down_queued; /* Used to override LED behavior for things like maintenance beaconing*/ /* -- 2.20.1