From: James Smart jsmart2021@gmail.com
commit 4012baeab6ca22b7f7beb121b6d0da0a62942fdd upstream.
When lpfc is handling a solicited and unsolicited PLOGI with another initiator, the remote initiator is never recovered. The node for the initiator is erroneouosly removed and all resources released.
In lpfc_cmpl_els_plogi(), when lpfc_els_retry() returns a failure code, the driver is calling the state machine with a device remove event because the remote port is not currently registered with the SCSI or NVMe transports. The issue is that on a PLOGI "collision" the driver correctly aborts the solicited PLOGI and allows the unsolicited PLOGI to complete the process, but this process is interrupted with a device_rm event.
Introduce logic in the PLOGI completion to capture the PLOGI collision event and jump out of the routine. This will avoid removal of the node. If there is no collision, the normal node removal will occur.
Fixes: 52edb2caf675 ("scsi: lpfc: Remove ndlp when a PLOGI/ADISC/PRLI/REG_RPI ultimately fails") Cc: stable@vger.kernel.org # v5.11+ Link: https://lore.kernel.org/r/20210514195559.119853-6-jsmart2021@gmail.com Co-developed-by: Justin Tee justin.tee@broadcom.com Signed-off-by: Justin Tee justin.tee@broadcom.com Signed-off-by: James Smart jsmart2021@gmail.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/scsi/lpfc/lpfc_els.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-)
--- a/drivers/scsi/lpfc/lpfc_els.c +++ b/drivers/scsi/lpfc/lpfc_els.c @@ -1998,9 +1998,20 @@ lpfc_cmpl_els_plogi(struct lpfc_hba *phb lpfc_disc_state_machine(vport, ndlp, cmdiocb, NLP_EVT_CMPL_PLOGI);
- /* As long as this node is not registered with the scsi or nvme - * transport, it is no longer an active node. Otherwise - * devloss handles the final cleanup. + /* If a PLOGI collision occurred, the node needs to continue + * with the reglogin process. + */ + spin_lock_irq(&ndlp->lock); + if ((ndlp->nlp_flag & (NLP_ACC_REGLOGIN | NLP_RCV_PLOGI)) && + ndlp->nlp_state == NLP_STE_REG_LOGIN_ISSUE) { + spin_unlock_irq(&ndlp->lock); + goto out; + } + spin_unlock_irq(&ndlp->lock); + + /* No PLOGI collision and the node is not registered with the + * scsi or nvme transport. It is no longer an active node. Just + * start the device remove process. */ if (!(ndlp->fc4_xpt_flags & (SCSI_XPT_REGD | NVME_XPT_REGD))) { spin_lock_irq(&ndlp->lock); @@ -4620,6 +4631,10 @@ out: (vport && vport->port_type == LPFC_NPIV_PORT) && ndlp->nlp_flag & NLP_RELEASE_RPI) { lpfc_sli4_free_rpi(phba, ndlp->nlp_rpi); + spin_lock_irq(&ndlp->lock); + ndlp->nlp_rpi = LPFC_RPI_ALLOC_ERROR; + ndlp->nlp_flag &= ~NLP_RELEASE_RPI; + spin_unlock_irq(&ndlp->lock); lpfc_drop_node(vport, ndlp); }