Fix off-by-one in channel count, from NetBSD.

"Looks right" deraadt@

diff --git a/sys/dev/fdt/bcm2835_dmac.c b/sys/dev/fdt/bcm2835_dmac.c
index 0149839..ccf4f83 100644 (file)
--- a/sys/dev/fdt/bcm2835_dmac.c
+++ b/sys/dev/fdt/bcm2835_dmac.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: bcm2835_dmac.c,v 1.3 2022/06/28 16:29:03 anton Exp $ */
+/*     $OpenBSD: bcm2835_dmac.c,v 1.4 2022/08/10 20:19:22 mglocker Exp $ */
 
 /*
  * Copyright (c) 2020 Tobias Heider <tobhe@openbsd.org>
@@ -170,7 +170,7 @@ bcmdmac_attach(struct device *parent, struct device *self, void *aux)
 
        mtx_init(&sc->sc_lock, IPL_SCHED);
 
-       sc->sc_nchannels = 31 - __builtin_clz(sc->sc_channelmask);
+       sc->sc_nchannels = 32 - __builtin_clz(sc->sc_channelmask);
        sc->sc_channels = malloc(sizeof(*sc->sc_channels) * sc->sc_nchannels,
            M_DEVBUF, M_WAITOK);