[automerger skipped] Merge "Fixes two data races in USAP pool management." into qt-dev
am: 5e468cf4dd -s ours
am skip reason: change_id Ie01637a10b356b80b5aa62291a97f2c167242827 with SHA1 f68c4e2ffa is in history

Change-Id: Iac707f390eba88848c63acdd2c0481ea5208ad1b