Index: sys/kern/subr_busdma_bounce.c =================================================================== --- sys/kern/subr_busdma_bounce.c +++ sys/kern/subr_busdma_bounce.c @@ -438,6 +438,7 @@ struct bus_dmamap *map, *nmap; thread_lock(curthread); + sched_class(curthread, PRI_ITHD); sched_prio(curthread, PI_SWI(SWI_BUSDMA)); thread_unlock(curthread); for (;;) {