sw64: megaraid: fix kernel panic caused by accessing an illegal address

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SPZD


CVE: NA

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On SUBARCH_C3B, when using the original driver for LSI MegaRAID
SAS-3 PCIe card, a kernel panic may arise from accessing an illegal
address. Make some changes for SUBARCH_C3B to avoid it. But it may
not be avoided entirely.

Signed-off-by: Gu Zitao <guzitao@wxiat.com> #openEuler_contributor
Signed-off-by: Laibin Qiu <qiulaibin@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>