[PATCH v4 02/14] lpfc: Early return out of lpfc_els_abort when HBA_SETUP flag is not set

[Nigel Kirkland <nkirkland2304@gmail.com>]

It is possible that a dev_loss_tmo callback fires during an hba reset.
The ELS pring structure is cleared by the hba reset path and the
dev_loss_tmo callback executing lpfc_els_abort could be using a stale ELS
pring pointer. To significantly reduce exposure, check if HBA_SETUP flag is set
before proceeding to use the ELS pring pointer in lpfc_els_abort. There is
no point to issue aborts when the sli port is not setup anyways.

Signed-off-by: Nigel Kirkland <nkirkland2304@gmail.com>
---
 drivers/scsi/lpfc/lpfc_nportdisc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/lpfc/lpfc_nportdisc.c b/drivers/scsi/lpfc/lpfc_nportdisc.c
index 9c449055a55e..2c8d995a45bf 100644
--- a/drivers/scsi/lpfc/lpfc_nportdisc.c
+++ b/drivers/scsi/lpfc/lpfc_nportdisc.c
@@ -227,6 +227,11 @@ lpfc_els_abort(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp)
 	struct lpfc_iocbq *iocb, *next_iocb;
 	int retval = 0;
 
+	/* Exit early to prevent race with queue teardown. */
+	if (unlikely(phba->sli_rev == LPFC_SLI_REV4 &&
+		     !test_bit(HBA_SETUP, &phba->hba_flag)))
+		return;
+
 	pring = lpfc_phba_elsring(phba);
 
 	/* In case of error recovery path, we might have a NULL pring here */
-- 
2.38.0