lpfc_nvme_register_port hit a null prev_ndlp pointer in a test with lots of target ports swapping addresses. The oldport value was stale, thus it's ndlp (prev_ndlp set to it) was used.
Fix by moving oldrport pointer checks, and if used prev_ndlp pointer assignment, to be done while the lock is held. Signed-off-by: Dick Kennedy <[email protected]> Signed-off-by: James Smart <[email protected]> --- drivers/scsi/lpfc/lpfc_nvme.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_nvme.c b/drivers/scsi/lpfc/lpfc_nvme.c index 946642cee3df..9746808cf94f 100644 --- a/drivers/scsi/lpfc/lpfc_nvme.c +++ b/drivers/scsi/lpfc/lpfc_nvme.c @@ -2317,9 +2317,13 @@ lpfc_nvme_register_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp) spin_lock_irq(&vport->phba->hbalock); oldrport = lpfc_ndlp_get_nrport(ndlp); - spin_unlock_irq(&vport->phba->hbalock); - if (!oldrport) + if (oldrport) { + prev_ndlp = oldrport->ndlp; + spin_unlock_irq(&vport->phba->hbalock); + } else { + spin_unlock_irq(&vport->phba->hbalock); lpfc_nlp_get(ndlp); + } ret = nvme_fc_register_remoteport(localport, &rpinfo, &remote_port); if (!ret) { @@ -2338,7 +2342,6 @@ lpfc_nvme_register_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp) /* New remoteport record does not guarantee valid * host private memory area. */ - prev_ndlp = oldrport->ndlp; if (oldrport == remote_port->private) { /* Same remoteport - ndlp should match. * Just reuse. @@ -2352,7 +2355,7 @@ lpfc_nvme_register_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp) remote_port->port_name, remote_port->port_id, remote_port->port_role, - prev_ndlp, + oldrport->ndlp, ndlp, ndlp->nlp_type, ndlp->nlp_DID); -- 2.13.7
