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RDMA/hns: Add a check for current state before modifying QP
[ Upstream commit e0ef0f6 ] It should be considered an illegal operation if the ULP attempts to modify a QP from another state to the current hardware state. Otherwise, the ULP can modify some fields of QPC at any time. For example, for a QP in state of RTS, modify it from RTR to RTS can change the PSN, which is always not as expected. Fixes: 9a44353 ("IB/hns: Add driver files for hns RoCE driver") Link: https://lore.kernel.org/r/1598353674-24270-1-git-send-email-liweihang@huawei.com Signed-off-by: Lang Cheng <chenglang@huawei.com> Signed-off-by: Weihang Li <liweihang@huawei.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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