From 341b2aa83368e6f23bf0cc3d04604896337ad7cb Mon Sep 17 00:00:00 2001 From: Dick Kennedy Date: Tue, 7 Nov 2017 12:59:02 -0800 Subject: scsi: lpfc: Fix hard lock up NMI in els timeout handling. System crashed due to a hard lockup at lpfc_els_timeout_handler+0x128. The els ring's txcmplq list is corrupted: the last element in the list does not point back the the head causing a loop. Issue is the els processing path for sli4 hbas are using the hbalock instead of the ring_lock for removing elements from the txcmplq list. Use the adapter SLI_REV to determine which lock should be used for removing iocbqs from the els rings txcmplq. note: the future refactoring will address this so that we don't have this ugly type-based lock code. Signed-off-by: Dick Kennedy Signed-off-by: James Smart Reviewed-by: Ewan D. Milne Signed-off-by: Martin K. Petersen --- drivers/scsi/lpfc/lpfc_sli.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 8c37885f4851..98c488ab720b 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -2732,7 +2732,8 @@ lpfc_sli_process_unsol_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring, * * This function looks up the iocb_lookup table to get the command iocb * corresponding to the given response iocb using the iotag of the - * response iocb. This function is called with the hbalock held. + * response iocb. This function is called with the hbalock held + * for sli3 devices or the ring_lock for sli4 devices. * This function returns the command iocb object if it finds the command * iocb else returns NULL. **/ @@ -2828,9 +2829,15 @@ lpfc_sli_process_sol_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring, unsigned long iflag; /* Based on the iotag field, get the cmd IOCB from the txcmplq */ - spin_lock_irqsave(&phba->hbalock, iflag); + if (phba->sli_rev == LPFC_SLI_REV4) + spin_lock_irqsave(&pring->ring_lock, iflag); + else + spin_lock_irqsave(&phba->hbalock, iflag); cmdiocbp = lpfc_sli_iocbq_lookup(phba, pring, saveq); - spin_unlock_irqrestore(&phba->hbalock, iflag); + if (phba->sli_rev == LPFC_SLI_REV4) + spin_unlock_irqrestore(&pring->ring_lock, iflag); + else + spin_unlock_irqrestore(&phba->hbalock, iflag); if (cmdiocbp) { if (cmdiocbp->iocb_cmpl) { -- cgit v1.2.3