[src/nick-nhusb]: src/sys/dev/usb Protect read of isoc->next with bus lock

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

details:   https://anonhg.NetBSD.org/src/rev/ca5d6804cd53
branches:  nick-nhusb
changeset: 804578:ca5d6804cd53
user:      skrll <skrll%NetBSD.org@localhost>
date:      Thu Mar 17 07:59:45 2016 +0000

description:
Protect read of isoc->next with bus lock

diffstat:

 sys/dev/usb/uhci.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (34 lines):

diff -r 7ea9bf8e6491 -r ca5d6804cd53 sys/dev/usb/uhci.c
--- a/sys/dev/usb/uhci.c        Sun Mar 13 08:09:00 2016 +0000
+++ b/sys/dev/usb/uhci.c        Thu Mar 17 07:59:45 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uhci.c,v 1.264.4.66 2016/03/13 08:09:00 skrll Exp $    */
+/*     $NetBSD: uhci.c,v 1.264.4.67 2016/03/17 07:59:45 skrll Exp $    */
 
 /*
  * Copyright (c) 1998, 2004, 2011, 2012 The NetBSD Foundation, Inc.
@@ -42,7 +42,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uhci.c,v 1.264.4.66 2016/03/13 08:09:00 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uhci.c,v 1.264.4.67 2016/03/17 07:59:45 skrll Exp $");
 
 #include "opt_usb.h"
 
@@ -3062,6 +3062,7 @@
                printf("%s: overflow!\n", __func__);
 #endif
 
+       mutex_enter(&sc->sc_lock);
        next = isoc->next;
        if (next == -1) {
                /* Not in use yet, schedule it a few frames ahead. */
@@ -3078,7 +3079,6 @@
                                     UHCI_TD_ACTIVE |
                                     UHCI_TD_IOS);
        nframes = xfer->ux_nframes;
-       mutex_enter(&sc->sc_lock);
        for (i = 0; i < nframes; i++) {
                std = isoc->stds[next];
                if (++next >= UHCI_VFRAMELIST_COUNT)