[src/trunk]: src/sys/dev/usb rearrange some parts of attach/detach to avoid p...

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

details:   https://anonhg.NetBSD.org/src/rev/b823ebc13b8a
branches:  trunk
changeset: 451869:b823ebc13b8a
user:      mrg <mrg%NetBSD.org@localhost>
date:      Sun Jun 09 13:35:47 2019 +0000

description:
rearrange some parts of attach/detach to avoid partial-attach
leading to detach crash.

diffstat:

 sys/dev/usb/if_ure.c |  45 +++++++++++++++++++++++++++------------------
 1 files changed, 27 insertions(+), 18 deletions(-)

diffs (96 lines):

diff -r 078fafc74df5 -r b823ebc13b8a sys/dev/usb/if_ure.c
--- a/sys/dev/usb/if_ure.c      Sun Jun 09 07:54:55 2019 +0000
+++ b/sys/dev/usb/if_ure.c      Sun Jun 09 13:35:47 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_ure.c,v 1.7 2019/05/28 07:41:50 msaitoh Exp $       */
+/*     $NetBSD: if_ure.c,v 1.8 2019/06/09 13:35:47 mrg Exp $   */
 /*     $OpenBSD: if_ure.c,v 1.10 2018/11/02 21:32:30 jcs Exp $ */
 /*-
  * Copyright (c) 2015-2016 Kevin Lo <kevlo%FreeBSD.org@localhost>
@@ -29,7 +29,7 @@
 /* RealTek RTL8152/RTL8153 10/100/Gigabit USB Ethernet device */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_ure.c,v 1.7 2019/05/28 07:41:50 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_ure.c,v 1.8 2019/06/09 13:35:47 mrg Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_usb.h"
@@ -1095,6 +1095,17 @@
        aprint_normal_dev(self, "%s\n", devinfop);
        usbd_devinfo_free(devinfop);
 
+       callout_init(&sc->ure_stat_ch, 0);
+       usb_init_task(&sc->ure_tick_task, ure_tick_task, sc, 0);
+       mutex_init(&sc->ure_mii_lock, MUTEX_DEFAULT, IPL_NONE);
+
+       /*
+        * ure_phyno is set to 0 below when configuration has succeeded.
+        * if it is still -1 in detach, then ifmedia/mii/etc was not
+        * setup and should not be torn down.
+        */
+       sc->ure_phyno = -1;
+
 #define URE_CONFIG_NO  1 /* XXX */
        error = usbd_set_config_no(dev, URE_CONFIG_NO, 1);
        if (error) {
@@ -1106,9 +1117,6 @@
        if (uaa->uaa_product == USB_PRODUCT_REALTEK_RTL8152)
                sc->ure_flags |= URE_FLAG_8152;
 
-       usb_init_task(&sc->ure_tick_task, ure_tick_task, sc, 0);
-       mutex_init(&sc->ure_mii_lock, MUTEX_DEFAULT, IPL_NONE);
-
 #define URE_IFACE_IDX  0 /* XXX */
        error = usbd_device2interface_handle(dev, URE_IFACE_IDX, &sc->ure_iface);
        if (error) {
@@ -1235,8 +1243,6 @@
        rnd_attach_source(&sc->ure_rnd_source, device_xname(sc->ure_dev),
            RND_TYPE_NET, RND_FLAG_DEFAULT);
 
-       callout_init(&sc->ure_stat_ch, 0);
-
        splx(s);
 
        usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->ure_udev, sc->ure_dev);
@@ -1268,16 +1274,18 @@
 
        s = splusb();
 
-       if (ifp->if_flags & IFF_RUNNING)
-               ure_stop(ifp, 1);
+       /* partial-attach, below items weren't configured. */
+       if (sc->ure_phyno != -1) {
+               if (ifp->if_flags & IFF_RUNNING)
+                       ure_stop(ifp, 1);
 
-       callout_destroy(&sc->ure_stat_ch);
-       rnd_detach_source(&sc->ure_rnd_source);
-       mii_detach(&sc->ure_mii, MII_PHY_ANY, MII_OFFSET_ANY);
-       ifmedia_delete_instance(&sc->ure_mii.mii_media, IFM_INST_ANY);
-       if (ifp->if_softc != NULL) {
-               ether_ifdetach(ifp);
-               if_detach(ifp);
+               rnd_detach_source(&sc->ure_rnd_source);
+               mii_detach(&sc->ure_mii, MII_PHY_ANY, MII_OFFSET_ANY);
+               ifmedia_delete_instance(&sc->ure_mii.mii_media, IFM_INST_ANY);
+               if (ifp->if_softc != NULL) {
+                       ether_ifdetach(ifp);
+                       if_detach(ifp);
+               }
        }
 
        if (--sc->ure_refcnt >= 0) {
@@ -1286,9 +1294,10 @@
        }
        splx(s);
 
-       usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->ure_udev, sc->ure_dev);
+       callout_destroy(&sc->ure_stat_ch);
+       mutex_destroy(&sc->ure_mii_lock);
 
-       mutex_destroy(&sc->ure_mii_lock);
+       usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->ure_udev, sc->ure_dev);
 
        return 0;
 }