[ Upstream commit e8869f5b0a7273fcf20ef99066fd8129e58ba5b7 ]
The adapter initialization sequence enables interrupts, initializes the adapter link_state to LINK_DOWN, then issues commands to initialize the adapter. The interrupt handler on the adapter validates the link_state (has to be at least LINK_DOWN) and if invalid, will discard the interrupting event.
In most cases, there is not a command completion, thus an interrupt until the initialization commands have been sent which is post the setting of state to LINK_DOWN. However, in cases of firmware reset, the reset will modify the link_state to an invalid value (indicating a reset of the adapter) and there occasionally are cases where the adapter will generate an asynchronous event which shares the eq/cq used for mailbox commands. In the failure case, an interrupt is generated immediately after enabling them due to the async event. As link_state is invalid, the eq is list and the CQ not serviced. At this point link_state is initialized and the mailbox command sent. As the CQ has not been serviced, it is not armed, so no interrupt event is generated when the mailbox command completes.
Modify the initialization sequence so that interrupts are enabled after link_state is properly initialized, which avoids the race condition with the async event.
Signed-off-by: Dick Kennedy dick.kennedy@broadcom.com Signed-off-by: James Smart jsmart2021@gmail.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/lpfc/lpfc_sli.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 57b4a463b5892..7d2abb70cf093 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -7652,12 +7652,6 @@ lpfc_sli4_hba_setup(struct lpfc_hba *phba) phba->cfg_xri_rebalancing = 0; }
- /* Arm the CQs and then EQs on device */ - lpfc_sli4_arm_cqeq_intr(phba); - - /* Indicate device interrupt mode */ - phba->sli4_hba.intr_enable = 1; - /* Allow asynchronous mailbox command to go through */ spin_lock_irq(&phba->hbalock); phba->sli.sli_flag &= ~LPFC_SLI_ASYNC_MBX_BLK; @@ -7726,6 +7720,12 @@ lpfc_sli4_hba_setup(struct lpfc_hba *phba) phba->trunk_link.link3.state = LPFC_LINK_DOWN; spin_unlock_irq(&phba->hbalock);
+ /* Arm the CQs and then EQs on device */ + lpfc_sli4_arm_cqeq_intr(phba); + + /* Indicate device interrupt mode */ + phba->sli4_hba.intr_enable = 1; + if (!(phba->hba_flag & HBA_FCOE_MODE) && (phba->hba_flag & LINK_DISABLED)) { lpfc_printf_log(phba, KERN_ERR, LOG_INIT | LOG_SLI,