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[ Upstream commit51976c6cd7] Provide a new api rdma_user_mmap_disassociate() for drivers to disassociate mmap pages for a device. Since drivers can now disassociate mmaps by calling this api, introduce a new disassociation_lock to specifically prevent races between this disassociation process and new mmaps. And thus the old hw_destroy_rwsem is not needed in this api. Signed-off-by: Chengchang Tang <tangchengchang@huawei.com> Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com> Link: https://patch.msgid.link/20240927103323.1897094-2-huangjunxian6@hisilicon.com Signed-off-by: Leon Romanovsky <leon@kernel.org> Stable-dep-of:615b94746a("RDMA/hns: Disassociate mmap pages for all uctx when HW is being reset") Signed-off-by: Sasha Levin <sashal@kernel.org>