scsi: hisi_sas: check IPTT is valid before using it for v3 hw

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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>

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Xiaofei Tan 2018-03-24 00:05:13 +08:00 • committed by Martin K. Petersen

parent 3ff0f0b657

commit 327f242fa8

1 changed files with 8 additions and 4 deletions

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drivers/scsi/hisi_sas/hisi_sas_v3_hw.c

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