[src/nick-nhusb]: src/sys/dev/usb Take bus lock while removing a device from ...

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

details:   https://anonhg.NetBSD.org/src/rev/883e8becea0c
branches:  nick-nhusb
changeset: 804739:883e8becea0c
user:      skrll <skrll%NetBSD.org@localhost>
date:      Thu Dec 29 08:40:27 2016 +0000

description:
Take bus lock while removing a device from the bus list and announce
detach once complete (not before)

diffstat:

 sys/dev/usb/usb_subr.c |  11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diffs (34 lines):

diff -r ced06d142848 -r 883e8becea0c sys/dev/usb/usb_subr.c
--- a/sys/dev/usb/usb_subr.c    Thu Dec 29 08:38:19 2016 +0000
+++ b/sys/dev/usb/usb_subr.c    Thu Dec 29 08:40:27 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: usb_subr.c,v 1.198.2.37 2016/12/29 08:38:19 skrll Exp $        */
+/*     $NetBSD: usb_subr.c,v 1.198.2.38 2016/12/29 08:40:27 skrll Exp $        */
 /*     $FreeBSD: src/sys/dev/usb/usb_subr.c,v 1.18 1999/11/17 22:33:47 n_hibma Exp $   */
 
 /*
@@ -32,7 +32,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: usb_subr.c,v 1.198.2.37 2016/12/29 08:38:19 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: usb_subr.c,v 1.198.2.38 2016/12/29 08:40:27 skrll Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_compat_netbsd.h"
@@ -1736,9 +1736,14 @@
                KASSERT(!dev->ud_nifaces_claimed);
        }
 
-       usbd_add_dev_event(USB_EVENT_DEVICE_DETACH, dev);
+       mutex_enter(dev->ud_bus->ub_lock);
        dev->ud_bus->ub_devices[dev->ud_addr] = NULL;
        up->up_dev = NULL;
+       mutex_exit(dev->ud_bus->ub_lock);
+
+       usbd_add_dev_event(USB_EVENT_DEVICE_DETACH, dev);
+
        usb_free_device(dev);
+
        return 0;
 }