[PATCH 6.8 101/336] scsi: lpfc: Release hbalock before calling lpfc_worker_wake_up()

Greg Kroah-Hartman
2024-05-14T10:31:43Z

From: Justin Tee <justin.tee@broadcom.com>

[ Upstream commit ded20192dff31c91cef2a04f7e20e60e9bb887d3 ]

lpfc_worker_wake_up() calls the lpfc_work_done() routine, which takes the
hbalock. Thus, lpfc_worker_wake_up() should not be called while holding the
hbalock to avoid potential deadlock.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20240305200503.57317-7-justintee8345@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 | 20 ++++++++++----------
drivers/scsi/lpfc/lpfc_hbadisc.c | 5 ++---
drivers/scsi/lpfc/lpfc_sli.c | 14 +++++++-------
3 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 4d723200690a4..26736122bda17 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -4462,23 +4462,23 @@ lpfc_els_retry_delay(struct timer_list *t)
unsigned long flags;
struct lpfc_work_evt *evtp = &ndlp->els_retry_evt;

+ /* Hold a node reference for outstanding queued work */
+ if (!lpfc_nlp_get(ndlp))
+ return;
+
spin_lock_irqsave(&phba->hbalock, flags);
if (!list_empty(&evtp->evt_listp)) {
spin_unlock_irqrestore(&phba->hbalock, flags);
+ lpfc_nlp_put(ndlp);
return;
}

- /* We need to hold the node by incrementing the reference
- * count until the queued work is done
- */
- evtp->evt_arg1 = lpfc_nlp_get(ndlp);
- if (evtp->evt_arg1) {
- evtp->evt = LPFC_EVT_ELS_RETRY;
- list_add_tail(&evtp->evt_listp, &phba->work_list);
- lpfc_worker_wake_up(phba);
- }
+ evtp->evt_arg1 = ndlp;
+ evtp->evt = LPFC_EVT_ELS_RETRY;
+ list_add_tail(&evtp->evt_listp, &phba->work_list);
spin_unlock_irqrestore(&phba->hbalock, flags);
- return;
+
+ lpfc_worker_wake_up(phba);
}

/**
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
index f80bbc315f4ca..da3aee0f63237 100644
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -257,7 +257,9 @@ lpfc_dev_loss_tmo_callbk(struct fc_rport *rport)
if (evtp->evt_arg1) {
evtp->evt = LPFC_EVT_DEV_LOSS;
list_add_tail(&evtp->evt_listp, &phba->work_list);
+ spin_unlock_irqrestore(&phba->hbalock, iflags);
lpfc_worker_wake_up(phba);
+ return;
}
spin_unlock_irqrestore(&phba->hbalock, iflags);
} else {
@@ -275,10 +277,7 @@ lpfc_dev_loss_tmo_callbk(struct fc_rport *rport)
lpfc_disc_state_machine(vport, ndlp, NULL,
NLP_EVT_DEVICE_RM);
}
-
}
-
- return;
}

/**
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 706985358c6a0..c00b945947b1d 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -1217,9 +1217,9 @@ lpfc_set_rrq_active(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp,
empty = list_empty(&phba->active_rrq_list);
list_add_tail(&rrq->list, &phba->active_rrq_list);
phba->hba_flag |= HBA_RRQ_ACTIVE;
+ spin_unlock_irqrestore(&phba->hbalock, iflags);
if (empty)
lpfc_worker_wake_up(phba);
- spin_unlock_irqrestore(&phba->hbalock, iflags);
return 0;
out:
spin_unlock_irqrestore(&phba->hbalock, iflags);
@@ -11373,18 +11373,18 @@ lpfc_sli_post_recovery_event(struct lpfc_hba *phba,
unsigned long iflags;
struct lpfc_work_evt *evtp = &ndlp->recovery_evt;

+ /* Hold a node reference for outstanding queued work */
+ if (!lpfc_nlp_get(ndlp))
+ return;
+
spin_lock_irqsave(&phba->hbalock, iflags);
if (!list_empty(&evtp->evt_listp)) {
spin_unlock_irqrestore(&phba->hbalock, iflags);
+ lpfc_nlp_put(ndlp);
return;
}

- /* Incrementing the reference count until the queued work is done. */
- evtp->evt_arg1 = lpfc_nlp_get(ndlp);
- if (!evtp->evt_arg1) {
- spin_unlock_irqrestore(&phba->hbalock, iflags);
- return;
- }
+ evtp->evt_arg1 = ndlp;
evtp->evt = LPFC_EVT_RECOVER_PORT;
list_add_tail(&evtp->evt_listp, &phba->work_list);
spin_unlock_irqrestore(&phba->hbalock, iflags);
--
2.43.0