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[src/trunk]: src/sys/dev/usb revert most of:
details: https://anonhg.NetBSD.org/src/rev/fa2fae254871
branches: trunk
changeset: 451116:fa2fae254871
user: mrg <mrg%NetBSD.org@localhost>
date: Mon May 06 23:47:39 2019 +0000
description:
revert most of:
>fix umodem(4) detach:
>
>- ucom(4) needs kpreempt disabled around softint_schedule()
>- switch a copied printf() to aprint_error_dev()
>- use static normally in umodem_common.c
>- remove unused sc_openings in softc, convert sc_dying to real bool
>- add sc_refcnt, sc_lock and sc_detach_cv to softc. usage is:
> - sc_dying is protected by sc_lock
> - sc_detach_cv is matched with sc_lock for cv operations
> - sc_refcnt is increased in open and decreased in close, any time
> it is decreased, it is checked for less than zero, and a broadcast
> performed on sc_detach_cv. detach waits for sc_refcnt.
>- umodem_param() and umodem_set() check for sc_dying
>
>this fixes pullout out an open ucom@umodem.
>
>@skrll.
>
>XXX: pullup
it only fixes the issue by chance (slightly delays, which
allows task to run, but there is no guarantee. real fix
is incoming for all ucom parents.
diffstat:
sys/dev/usb/umodem_common.c | 64 +++++---------------------------------------
sys/dev/usb/umodemvar.h | 6 +---
2 files changed, 9 insertions(+), 61 deletions(-)
diffs (186 lines):
diff -r 63da0d64605e -r fa2fae254871 sys/dev/usb/umodem_common.c
--- a/sys/dev/usb/umodem_common.c Mon May 06 23:46:25 2019 +0000
+++ b/sys/dev/usb/umodem_common.c Mon May 06 23:47:39 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: umodem_common.c,v 1.28 2019/05/04 08:04:13 mrg Exp $ */
+/* $NetBSD: umodem_common.c,v 1.29 2019/05/06 23:47:39 mrg Exp $ */
/*
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -44,7 +44,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: umodem_common.c,v 1.28 2019/05/04 08:04:13 mrg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: umodem_common.c,v 1.29 2019/05/06 23:47:39 mrg Exp $");
#ifdef _KERNEL_OPT
#include "opt_usb.h"
@@ -120,15 +120,11 @@
sc->sc_dev = self;
sc->sc_udev = dev;
sc->sc_ctl_iface = uiaa->uiaa_iface;
- sc->sc_refcnt = 0;
sc->sc_dying = false;
aprint_naive("\n");
aprint_normal("\n");
- mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_SOFTUSB);
- cv_init(&sc->sc_detach_cv, "umodemdet");
-
id = usbd_get_interface_descriptor(sc->sc_ctl_iface);
devinfop = usbd_devinfo_alloc(uiaa->uiaa_device, 0);
aprint_normal_dev(self, "%s, iclass %d/%d\n",
@@ -271,14 +267,8 @@
struct umodem_softc *sc = addr;
int err;
- mutex_enter(&sc->sc_lock);
- if (sc->sc_dying) {
- mutex_exit(&sc->sc_lock);
+ if (sc->sc_dying)
return EIO;
- }
-
- sc->sc_refcnt++;
- mutex_exit(&sc->sc_lock);
DPRINTF(("umodem_open: sc=%p\n", sc));
@@ -291,10 +281,6 @@
if (err) {
DPRINTF(("Failed to establish notify pipe: %s\n",
usbd_errstr(err)));
- mutex_enter(&sc->sc_lock);
- if (--sc->sc_refcnt < 0)
- cv_broadcast(&sc->sc_detach_cv);
- mutex_exit(&sc->sc_lock);
return EIO;
}
}
@@ -306,32 +292,17 @@
umodem_close(void *addr, int portno)
{
struct umodem_softc *sc = addr;
- int err;
-
- mutex_enter(&sc->sc_lock);
- if (sc->sc_dying)
- goto out;
- mutex_exit(&sc->sc_lock);
DPRINTF(("umodem_close: sc=%p\n", sc));
+ if (sc->sc_dying)
+ return;
+
if (sc->sc_notify_pipe != NULL) {
- err = usbd_abort_pipe(sc->sc_notify_pipe);
- if (err)
- printf("%s: abort notify pipe failed: %s\n",
- device_xname(sc->sc_dev), usbd_errstr(err));
- err = usbd_close_pipe(sc->sc_notify_pipe);
- if (err)
- printf("%s: close notify pipe failed: %s\n",
- device_xname(sc->sc_dev), usbd_errstr(err));
+ usbd_abort_pipe(sc->sc_notify_pipe);
+ usbd_close_pipe(sc->sc_notify_pipe);
sc->sc_notify_pipe = NULL;
}
-
- mutex_enter(&sc->sc_lock);
-out:
- if (--sc->sc_refcnt < 0)
- cv_broadcast(&sc->sc_detach_cv);
- mutex_exit(&sc->sc_lock);
}
static void
@@ -465,10 +436,8 @@
usbd_status err;
usb_cdc_line_state_t ls;
- mutex_enter(&sc->sc_lock);
if (sc->sc_dying)
return EIO;
- mutex_exit(&sc->sc_lock);
DPRINTF(("umodem_param: sc=%p\n", sc));
@@ -514,10 +483,8 @@
struct umodem_softc *sc = addr;
int error = 0;
- mutex_enter(&sc->sc_lock);
if (sc->sc_dying)
return EIO;
- mutex_exit(&sc->sc_lock);
DPRINTF(("umodem_ioctl: cmd=0x%08lx\n", cmd));
@@ -607,10 +574,8 @@
{
struct umodem_softc *sc = addr;
- mutex_enter(&sc->sc_lock);
if (sc->sc_dying)
return;
- mutex_exit(&sc->sc_lock);
switch (reg) {
case UCOM_SET_DTR:
@@ -692,9 +657,7 @@
{
switch (act) {
case DVACT_DEACTIVATE:
- mutex_enter(&sc->sc_lock);
sc->sc_dying = true;
- mutex_exit(&sc->sc_lock);
return 0;
default:
return EOPNOTSUPP;
@@ -715,23 +678,12 @@
DPRINTF(("umodem_common_detach: sc=%p flags=%d\n", sc, flags));
- mutex_enter(&sc->sc_lock);
sc->sc_dying = true;
- sc->sc_refcnt--;
- while (sc->sc_refcnt > 0) {
- if (cv_timedwait(&sc->sc_detach_cv, &sc->sc_lock, hz * 60))
- aprint_error_dev(sc->sc_dev, ": didn't detach\n");
- }
- mutex_exit(&sc->sc_lock);
-
if (sc->sc_subdev != NULL)
rv = config_detach(sc->sc_subdev, flags);
usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev, sc->sc_dev);
- mutex_destroy(&sc->sc_lock);
- cv_destroy(&sc->sc_detach_cv);
-
return rv;
}
diff -r 63da0d64605e -r fa2fae254871 sys/dev/usb/umodemvar.h
--- a/sys/dev/usb/umodemvar.h Mon May 06 23:46:25 2019 +0000
+++ b/sys/dev/usb/umodemvar.h Mon May 06 23:47:39 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: umodemvar.h,v 1.10 2019/04/20 05:53:18 mrg Exp $ */
+/* $NetBSD: umodemvar.h,v 1.11 2019/05/06 23:47:39 mrg Exp $ */
/*
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -53,10 +53,6 @@
bool sc_dying; /* disconnecting */
- kmutex_t sc_lock;
- kcondvar_t sc_detach_cv;
- int sc_refcnt;
-
int sc_ctl_notify; /* Notification endpoint */
struct usbd_pipe * sc_notify_pipe; /* Notification pipe */
usb_cdc_notification_t sc_notify_buf; /* Notification structure */
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