[src/trunk]: src/sys/dev/pci Limit the number of dma segments used for transm...

[nonaka <nonaka%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/65c0590deb76
branches:  trunk
changeset: 338410:65c0590deb76
user:      nonaka <nonaka%NetBSD.org@localhost>
date:      Fri May 22 15:32:21 2015 +0000

description:
Limit the number of dma segments used for transmitting packets to
IWM_NUM_OF_TBS - 2.  We have IWM_NUM_OF_TBS slots, but use two of those
for sending commands to the firmware.

>From OpenBSD rev. 1.41.

diffstat:

 sys/dev/pci/if_iwm.c |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (29 lines):

diff -r 0e124fb4c250 -r 65c0590deb76 sys/dev/pci/if_iwm.c
--- a/sys/dev/pci/if_iwm.c      Fri May 22 10:34:13 2015 +0000
+++ b/sys/dev/pci/if_iwm.c      Fri May 22 15:32:21 2015 +0000
@@ -1,5 +1,5 @@
-/*     $NetBSD: if_iwm.c,v 1.34 2015/05/16 07:58:19 nonaka Exp $       */
-/*     OpenBSD: if_iwm.c,v 1.39 2015/03/23 00:35:19 jsg Exp    */
+/*     $NetBSD: if_iwm.c,v 1.35 2015/05/22 15:32:21 nonaka Exp $       */
+/*     OpenBSD: if_iwm.c,v 1.41 2015/05/22 06:50:54 kettenis Exp       */
 
 /*
  * Copyright (c) 2014 genua mbh <info%genua.de@localhost>
@@ -105,7 +105,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_iwm.c,v 1.34 2015/05/16 07:58:19 nonaka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_iwm.c,v 1.35 2015/05/22 15:32:21 nonaka Exp $");
 
 #include <sys/param.h>
 #include <sys/conf.h>
@@ -1224,7 +1224,7 @@
                paddr += sizeof(struct iwm_device_cmd);
 
                error = bus_dmamap_create(sc->sc_dmat, IWM_RBUF_SIZE,
-                   IWM_NUM_OF_TBS, IWM_RBUF_SIZE, 0, BUS_DMA_NOWAIT,
+                   IWM_NUM_OF_TBS - 2, IWM_RBUF_SIZE, 0, BUS_DMA_NOWAIT,
                    &data->map);
                if (error != 0) {
                        aprint_error_dev(sc->sc_dev,