diff options
| author | Xiaofei Tan <tanxiaofei@huawei.com> | 2018-03-24 00:05:13 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-04-18 19:32:51 -0400 |
| commit | 327f242fa806c199a183c2197592e94d336c8266 (patch) | |
| tree | a13a113842286021dee72db6304b3ad895ad48bc /drivers | |
| parent | 3ff0f0b657eb414c1f8f1f22b91d52b892d8a850 (diff) | |
scsi: hisi_sas: check IPTT is valid before using it for v3 hw
There is a bug of v3 hw development version. When AXI error happen, hw
may return an abnormal CQ that IPTT value is 0xffff. This will cause
IPTT out-of-bounds reference.
This patch adds a check of IPTT in cq_tasklet_v3_hw() and discards
invalid slot. This workaround scheme is just to enhance fault-tolerance
of the driver. So, we will apply this scheme for all version of v3 hw,
although release version has fixed this SoC bug.
Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c index efe64bcfa4f2..aa52d5e424f7 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c @@ -1731,15 +1731,19 @@ static void cq_tasklet_v3_hw(unsigned long val) while (rd_point != wr_point) { struct hisi_sas_complete_v3_hdr *complete_hdr; + struct device *dev = hisi_hba->dev; int iptt; complete_hdr = &complete_queue[rd_point]; iptt = (complete_hdr->dw1) & CMPLT_HDR_IPTT_MSK; - slot = &hisi_hba->slot_info[iptt]; - slot->cmplt_queue_slot = rd_point; - slot->cmplt_queue = queue; - slot_complete_v3_hw(hisi_hba, slot); + if (likely(iptt < HISI_SAS_COMMAND_ENTRIES_V3_HW)) { + slot = &hisi_hba->slot_info[iptt]; + slot->cmplt_queue_slot = rd_point; + slot->cmplt_queue = queue; + slot_complete_v3_hw(hisi_hba, slot); + } else + dev_err(dev, "IPTT %d is invalid, discard it.\n", iptt); if (++rd_point >= HISI_SAS_QUEUE_SLOTS) rd_point = 0; |