diff options
| author | James Smart <james.smart@broadcom.com> | 2016-12-20 02:07:30 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2017-01-05 08:21:12 +0300 |
| commit | 6b3b3bdb83b4ad51252d21bb13596db879e51850 (patch) | |
| tree | f17ff435e68b90c8ff8cc125d69a89bafe81a2c4 /drivers/scsi/lpfc | |
| parent | 2f07784f05c23b322863274e801c31aa64e46c71 (diff) | |
| download | linux-6b3b3bdb83b4ad51252d21bb13596db879e51850.tar.xz | |
scsi: lpfc: Add missing memory barrier
On loosely ordered memory systems (PPC for example), the WQE elements
were being updated in memory, but not necessarily flushed before the
separate doorbell was written to hw which would cause hw to dma the
WQE element. Thus, the hardware occasionally received partially
updated WQE data.
Add the memory barrier after updating the WQE memory.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/lpfc')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_sli.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 7e11cbdb238c..3a8470d55af5 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -120,6 +120,8 @@ lpfc_sli4_wq_put(struct lpfc_queue *q, union lpfc_wqe *wqe) if (q->phba->sli3_options & LPFC_SLI4_PHWQ_ENABLED) bf_set(wqe_wqid, &wqe->generic.wqe_com, q->queue_id); lpfc_sli_pcimem_bcopy(wqe, temp_wqe, q->entry_size); + /* ensure WQE bcopy flushed before doorbell write */ + wmb(); /* Update the host index before invoking device */ host_index = q->host_index; |