func: static void scsi_dma_restart_bh(void *opaque) SCSIRequest * req , * next ; if ( req -> retry )  req -> retry = false; switch ( req -> cmd . mode )  scsi_req_enqueue ( req ); int32_t scsi_req_enqueue(SCSIRequest *req) scsi_req_ref ( req ); SCSIRequest *scsi_req_ref(SCSIRequest *req) assert ( req -> refcount > 0 ); 