There is no need to lock g_ftl_bdev_lock when unregister a ftl_bdev.
Besides, the destructor of ftl_bdev will lock it again.
Change-Id: I99870483183879d9422584dbac6e154f605daea8
Signed-off-by: wuzhouhui <wuzhouhui@kingsoft.com>
Reviewed-on: https://review.gerrithub.io/c/444794
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
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