[PATCH 4.14 063/173] s390/qeth: fix race in used-buffer accounting

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Julian Wiedmann [ Upstream commit a702349a4099cd5a7bab0904689d8e0bf8dcd622 ] By updating q->used_buffers only _after_ do_QDIO() has completed, there is a potential race against the buffer's

[PATCH 4.14 063/173] s390/qeth: fix race in used-buffer accounting

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Julian Wiedmann [ Upstream commit a702349a4099cd5a7bab0904689d8e0bf8dcd622 ] By updating q->used_buffers only _after_ do_QDIO() has completed, there is a potential race against the buffer's