From 9e210178267b80c4eeb832fade7e146a18c84915 Mon Sep 17 00:00:00 2001 From: James Smart Date: Thu, 13 Sep 2018 15:41:10 -0700 Subject: scsi: lpfc: Synchronize access to remoteport via rport The driver currently uses the ndlp to get the local rport which is then used to get the nvme transport remoteport pointer. There can be cases where a stale remoteport pointer is obtained as synchronization isn't done through the different dereferences. Correct by using locks to synchronize the dereferences. Signed-off-by: Dick Kennedy Signed-off-by: James Smart Signed-off-by: Martin K. Petersen --- drivers/scsi/lpfc/lpfc_attr.c | 15 ++++++++++----- drivers/scsi/lpfc/lpfc_debugfs.c | 10 +++++----- drivers/scsi/lpfc/lpfc_nvme.c | 11 ++++++++--- 3 files changed, 23 insertions(+), 13 deletions(-) (limited to 'drivers/scsi') diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c index 057a60abe664..1a6ed9b0a249 100644 --- a/drivers/scsi/lpfc/lpfc_attr.c +++ b/drivers/scsi/lpfc/lpfc_attr.c @@ -360,12 +360,12 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr, goto buffer_done; list_for_each_entry(ndlp, &vport->fc_nodes, nlp_listp) { + nrport = NULL; + spin_lock(&vport->phba->hbalock); rport = lpfc_ndlp_get_nrport(ndlp); - if (!rport) - continue; - - /* local short-hand pointer. */ - nrport = rport->remoteport; + if (rport) + nrport = rport->remoteport; + spin_unlock(&vport->phba->hbalock); if (!nrport) continue; @@ -3386,6 +3386,7 @@ lpfc_update_rport_devloss_tmo(struct lpfc_vport *vport) struct lpfc_nodelist *ndlp; #if (IS_ENABLED(CONFIG_NVME_FC)) struct lpfc_nvme_rport *rport; + struct nvme_fc_remote_port *remoteport = NULL; #endif shost = lpfc_shost_from_vport(vport); @@ -3396,8 +3397,12 @@ lpfc_update_rport_devloss_tmo(struct lpfc_vport *vport) if (ndlp->rport) ndlp->rport->dev_loss_tmo = vport->cfg_devloss_tmo; #if (IS_ENABLED(CONFIG_NVME_FC)) + spin_lock(&vport->phba->hbalock); rport = lpfc_ndlp_get_nrport(ndlp); if (rport) + remoteport = rport->remoteport; + spin_unlock(&vport->phba->hbalock); + if (remoteport) nvme_fc_set_remoteport_devloss(rport->remoteport, vport->cfg_devloss_tmo); #endif diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c b/drivers/scsi/lpfc/lpfc_debugfs.c index 9df0c051349f..aec5b10a8c85 100644 --- a/drivers/scsi/lpfc/lpfc_debugfs.c +++ b/drivers/scsi/lpfc/lpfc_debugfs.c @@ -551,7 +551,7 @@ lpfc_debugfs_nodelist_data(struct lpfc_vport *vport, char *buf, int size) unsigned char *statep; struct nvme_fc_local_port *localport; struct lpfc_nvmet_tgtport *tgtp; - struct nvme_fc_remote_port *nrport; + struct nvme_fc_remote_port *nrport = NULL; struct lpfc_nvme_rport *rport; cnt = (LPFC_NODELIST_SIZE / LPFC_NODELIST_ENTRY_SIZE); @@ -696,11 +696,11 @@ lpfc_debugfs_nodelist_data(struct lpfc_vport *vport, char *buf, int size) len += snprintf(buf + len, size - len, "\tRport List:\n"); list_for_each_entry(ndlp, &vport->fc_nodes, nlp_listp) { /* local short-hand pointer. */ + spin_lock(&phba->hbalock); rport = lpfc_ndlp_get_nrport(ndlp); - if (!rport) - continue; - - nrport = rport->remoteport; + if (rport) + nrport = rport->remoteport; + spin_unlock(&phba->hbalock); if (!nrport) continue; diff --git a/drivers/scsi/lpfc/lpfc_nvme.c b/drivers/scsi/lpfc/lpfc_nvme.c index 028462e5994d..918ae18ef8a8 100644 --- a/drivers/scsi/lpfc/lpfc_nvme.c +++ b/drivers/scsi/lpfc/lpfc_nvme.c @@ -2725,7 +2725,9 @@ lpfc_nvme_register_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp) rpinfo.port_name = wwn_to_u64(ndlp->nlp_portname.u.wwn); rpinfo.node_name = wwn_to_u64(ndlp->nlp_nodename.u.wwn); + spin_lock_irq(&vport->phba->hbalock); oldrport = lpfc_ndlp_get_nrport(ndlp); + spin_unlock_irq(&vport->phba->hbalock); if (!oldrport) lpfc_nlp_get(ndlp); @@ -2840,7 +2842,7 @@ lpfc_nvme_unregister_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp) struct nvme_fc_local_port *localport; struct lpfc_nvme_lport *lport; struct lpfc_nvme_rport *rport; - struct nvme_fc_remote_port *remoteport; + struct nvme_fc_remote_port *remoteport = NULL; localport = vport->localport; @@ -2854,11 +2856,14 @@ lpfc_nvme_unregister_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp) if (!lport) goto input_err; + spin_lock_irq(&vport->phba->hbalock); rport = lpfc_ndlp_get_nrport(ndlp); - if (!rport) + if (rport) + remoteport = rport->remoteport; + spin_unlock_irq(&vport->phba->hbalock); + if (!remoteport) goto input_err; - remoteport = rport->remoteport; lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC, "6033 Unreg nvme remoteport %p, portname x%llx, " "port_id x%06x, portstate x%x port type x%x\n", -- cgit v1.2.3