tcm_vhost: document inflight ref-counting use (3dfbff32) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/vhost/tcm_vhost.c

+10 −2

Original line number	Diff line number	Diff line
		@@ -83,9 +83,16 @@ struct vhost_scsi_inflight {

		struct vhost_scsi_virtqueue {
		struct vhost_virtqueue vq;
		/* Track inflight reqs, protected by vq->mutex */
		/*
		* Reference counting for inflight reqs, used for flush operation. At
		* each time, one reference tracks new commands submitted, while we
		* wait for another one to reach 0.
		*/
		struct vhost_scsi_inflight inflights[2];
		/* Indicate current inflight in use, protected by vq->mutex */
		/*
		* Indicate current inflight in use, protected by vq->mutex.
		* Writers must also take dev mutex and flush under it.
		*/
		int inflight_idx;
		};

		@@ -1015,6 +1022,7 @@ static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
		vhost_poll_flush(&vs->vqs[index].vq.poll);
		}

		/* Callers must hold dev mutex */
		static void vhost_scsi_flush(struct vhost_scsi *vs)
		{
		struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];