free_bdev() polls threads to push the bdev unregister forward.
get_device_stat_test called the free_bdev() within a callback,
which results in polling threads recursively.
Discovered while working on asynchronous registration for bdevs.
Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Change-Id: Ib4f6f50c1542d11e98f8ba093710620cca016eb4
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/5211
Community-CI: Broadcom CI
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
c83ffe324f