RDMA/hns: Fixes concurrent ressetting and post_recv in DCA mode

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I63KVU



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read_poll_timeout() in MBX may cause sleep, especially at reset, the
probability becomes higher. In other words, it is not safe to use MBX
in an atomic context.

In order to ensure the atomicity of QPC setup, DCA will use locks to
protect the QPC setup operation in DCA ATTACH_MEM phase(i.e.
post_send/post_recv). This results in the above-mentioned problem at
reset.

Replace read_poll_timeout() with read_poll_timeout_atomic() to avoid
MBX operation sleep in an atomic context().

Fixes: 306b8c76 ("RDMA/hns: Do not destroy QP resources in the hw resetting phase")
Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Reviewed-by: Yangyang Li <liyangyang20@huawei.com>
Reviewed-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>