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authorJames Smart <jsmart2021@gmail.com>2018-01-30 15:58:54 -0800
committerMartin K. Petersen <martin.petersen@oracle.com>2018-02-12 11:43:23 -0500
commit161df4f09987ae2e9f0f97f0b38eee298b4a39ff (patch)
parent64bf009933bc84a7fb44ff50f86af0201b8be0c3 (diff)
scsi: lpfc: Fix soft lockup in lpfc worker thread during LIP testing
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>
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
index b159a5c4e388..9265906d956e 100644
--- 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) {
- /* 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) {