From: James Smart <jsmart2021@gmail.com>
Date: Tue, 30 Jan 2018 15:58:54 -0800
Subject: scsi: lpfc: Fix soft lockup in lpfc worker thread during LIP testing
Patch-mainline: v4.17-rc1
Git-commit: 161df4f09987ae2e9f0f97f0b38eee298b4a39ff
References: bsc#1080657
During link bounce testing in a point-to-point topology, the host may
enter a soft lockup on the lpfc_worker thread:
Call Trace:
lpfc_work_done+0x1f3/0x1390 [lpfc]
lpfc_do_work+0x16f/0x180 [lpfc]
kthread+0xc7/0xe0
ret_from_fork+0x3f/0x70
The driver was simultaneously setting a combination of flags that caused
lpfc_do_work()to effectively spin between slow path work and new event
data, causing the lockup.
Ensure in the typical wq completions, that new event data flags are set
if the slow path flag is running. The slow path will eventually
reschedule the wq handling.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
drivers/scsi/lpfc/lpfc_hbadisc.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -696,8 +696,9 @@ lpfc_work_done(struct lpfc_hba *phba)
phba->hba_flag & HBA_SP_QUEUE_EVT)) {
if (pring->flag & LPFC_STOP_IOCB_EVENT) {
pring->flag |= LPFC_DEFERRED_RING_EVENT;
- /* Set the lpfc data pending flag */
- set_bit(LPFC_DATA_READY, &phba->data_flags);
+ /* Preserve legacy behavior. */
+ if (!(phba->hba_flag & HBA_SP_QUEUE_EVT))
+ set_bit(LPFC_DATA_READY, &phba->data_flags);
} else {
if (phba->link_state >= LPFC_LINK_UP ||
phba->link_flag & LS_MDS_LOOPBACK) {