From: Arun Easi <aeasi@xxxxxxxxxxx>
Driver registration of localport can race when it
happens at the remote port discovery time. Fix
this by calling the registration under a mutex.
Reported-by: Marco Patalano <mpatalan@xxxxxxxxxx>
Tested-by: Marco Patalano <mpatalan@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: e84067d74301 ("scsi: qla2xxx: Add FC-NVMe F/W initialization and transport registration")
Signed-off-by: Arun Easi <aeasi@xxxxxxxxxxx>
Signed-off-by: Nilesh Javali <njavali@xxxxxxxxxxx>
Reviewed-by: Himanshu Madhani <himanshu.madhani@xxxxxxxxxx>
---
drivers/scsi/qla2xxx/qla_nvme.c | 30 ++++++++++++++++++++----------
1 file changed, 20 insertions(+), 10 deletions(-)
diff --git a/drivers/scsi/qla2xxx/qla_nvme.c b/drivers/scsi/qla2xxx/qla_nvme.c
index 5723082d94d6..3bf5cbd754a7 100644
--- a/drivers/scsi/qla2xxx/qla_nvme.c
+++ b/drivers/scsi/qla2xxx/qla_nvme.c
@@ -782,8 +782,6 @@ int qla_nvme_register_hba(struct scsi_qla_host *vha)
ha = vha->hw;
tmpl = &qla_nvme_fc_transport;
- WARN_ON(vha->nvme_local_port);
-
if (ql2xnvme_queues < MIN_NVME_HW_QUEUES || ql2xnvme_queues > MAX_NVME_HW_QUEUES) {
ql_log(ql_log_warn, vha, 0xfffd,
"ql2xnvme_queues=%d is out of range(MIN:%d - MAX:%d). Resetting ql2xnvme_queues to:%d\n",
@@ -797,7 +795,7 @@ int qla_nvme_register_hba(struct scsi_qla_host *vha)
(uint8_t)(ha->max_qpairs ? ha->max_qpairs : 1));
ql_log(ql_log_info, vha, 0xfffb,
- "Number of NVME queues used for this port: %d\n",
+ "Number of NVME queues used for this port: %d\n",
qla_nvme_fc_transport.max_hw_queues);
pinfo.node_name = wwn_to_u64(vha->node_name);
@@ -805,13 +803,25 @@ int qla_nvme_register_hba(struct scsi_qla_host *vha)
pinfo.port_role = FC_PORT_ROLE_NVME_INITIATOR;
pinfo.port_id = vha->d_id.b24;
- ql_log(ql_log_info, vha, 0xffff,
- "register_localport: host-traddr=nn-0x%llx:pn-0x%llx on portID:%x\n",
- pinfo.node_name, pinfo.port_name, pinfo.port_id);
- qla_nvme_fc_transport.dma_boundary = vha->host->dma_boundary;
-
- ret = nvme_fc_register_localport(&pinfo, tmpl,
- get_device(&ha->pdev->dev), &vha->nvme_local_port);
+ mutex_lock(&ha->vport_lock);
+ /*
+ * Check again for nvme_local_port to see if any other thread raced
+ * with this one and finished registration.
+ */
+ if (!vha->nvme_local_port) {
+ ql_log(ql_log_info, vha, 0xffff,
+ "register_localport: host-traddr=nn-0x%llx:pn-0x%llx on portID:%x\n",
+ pinfo.node_name, pinfo.port_name, pinfo.port_id);
+ qla_nvme_fc_transport.dma_boundary = vha->host->dma_boundary;
+
+ ret = nvme_fc_register_localport(&pinfo, tmpl,
+ get_device(&ha->pdev->dev),
+ &vha->nvme_local_port);
+ mutex_unlock(&ha->vport_lock);
+ } else {
+ mutex_unlock(&ha->vport_lock);
+ return 0;
+ }
if (ret) {
ql_log(ql_log_warn, vha, 0xffff,
"register_localport failed: ret=%x\n", ret);
--
2.19.0.rc0
