[PATCH AUTOSEL 5.4 001/134] scsi: lpfc: Fix spinlock_irq issues in lpfc_els_flush_cmd()

Sasha Levin
2019-12-11T16:11:01Z

From: James Smart <jsmart2021@gmail.com>

[ Upstream commit d38b4a527fe898f859f74a3a43d4308f48ac7855 ]

While reviewing the CT behavior, issues with spinlock_irq were seen. The
driver should be using spinlock_irqsave/irqrestore in the els flush
routine.

Changed to spinlock_irqsave/irqrestore.

Link: https://lore.kernel.org/r/20190922035906.10977-15-jsmart2021@gmail.com
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/lpfc/lpfc_els.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index d5303994bfd62..0052b341587d9 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -7986,20 +7986,22 @@ lpfc_els_flush_cmd(struct lpfc_vport *vport)
struct lpfc_sli_ring *pring;
struct lpfc_iocbq *tmp_iocb, *piocb;
IOCB_t *cmd = NULL;
+ unsigned long iflags = 0;

lpfc_fabric_abort_vport(vport);
+
/*
* For SLI3, only the hbalock is required. But SLI4 needs to coordinate
* with the ring insert operation. Because lpfc_sli_issue_abort_iotag
* ultimately grabs the ring_lock, the driver must splice the list into
* a working list and release the locks before calling the abort.
*/
- spin_lock_irq(&phba->hbalock);
+ spin_lock_irqsave(&phba->hbalock, iflags);
pring = lpfc_phba_elsring(phba);

/* Bail out if we've no ELS wq, like in PCI error recovery case. */
if (unlikely(!pring)) {
- spin_unlock_irq(&phba->hbalock);
+ spin_unlock_irqrestore(&phba->hbalock, iflags);
return;
}

@@ -8037,21 +8039,21 @@ lpfc_els_flush_cmd(struct lpfc_vport *vport)

if (phba->sli_rev == LPFC_SLI_REV4)
spin_unlock(&pring->ring_lock);
- spin_unlock_irq(&phba->hbalock);
+ spin_unlock_irqrestore(&phba->hbalock, iflags);

/* Abort each txcmpl iocb on aborted list and remove the dlist links. */
list_for_each_entry_safe(piocb, tmp_iocb, &abort_list, dlist) {
- spin_lock_irq(&phba->hbalock);
+ spin_lock_irqsave(&phba->hbalock, iflags);
list_del_init(&piocb->dlist);
lpfc_sli_issue_abort_iotag(phba, pring, piocb);
- spin_unlock_irq(&phba->hbalock);
+ spin_unlock_irqrestore(&phba->hbalock, iflags);
}
if (!list_empty(&abort_list))
lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
"3387 abort list for txq not empty\n");
INIT_LIST_HEAD(&abort_list);

- spin_lock_irq(&phba->hbalock);
+ spin_lock_irqsave(&phba->hbalock, iflags);
if (phba->sli_rev == LPFC_SLI_REV4)
spin_lock(&pring->ring_lock);

@@ -8091,7 +8093,7 @@ lpfc_els_flush_cmd(struct lpfc_vport *vport)

if (phba->sli_rev == LPFC_SLI_REV4)
spin_unlock(&pring->ring_lock);
- spin_unlock_irq(&phba->hbalock);
+ spin_unlock_irqrestore(&phba->hbalock, iflags);

/* Cancel all the IOCBs from the completions list */
lpfc_sli_cancel_iocbs(phba, &abort_list,
--
2.20.1