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[src/trunk]: src/sys/dev/usb Use callout_halt and usb_rem_task_wait on detach...
details: https://anonhg.NetBSD.org/src/rev/3f8377c9b177
branches: trunk
changeset: 834119:3f8377c9b177
user: riastradh <riastradh%NetBSD.org@localhost>
date: Sun Jul 29 02:00:17 2018 +0000
description:
Use callout_halt and usb_rem_task_wait on detach in aue(4).
diffstat:
sys/dev/usb/if_aue.c | 17 ++++++++++-------
1 files changed, 10 insertions(+), 7 deletions(-)
diffs (40 lines):
diff -r 8010ce58ff35 -r 3f8377c9b177 sys/dev/usb/if_aue.c
--- a/sys/dev/usb/if_aue.c Sun Jul 29 02:00:07 2018 +0000
+++ b/sys/dev/usb/if_aue.c Sun Jul 29 02:00:17 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: if_aue.c,v 1.143 2018/06/26 06:48:02 msaitoh Exp $ */
+/* $NetBSD: if_aue.c,v 1.144 2018/07/29 02:00:17 riastradh Exp $ */
/*
* Copyright (c) 1997, 1998, 1999, 2000
@@ -78,7 +78,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_aue.c,v 1.143 2018/06/26 06:48:02 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_aue.c,v 1.144 2018/07/29 02:00:17 riastradh Exp $");
#ifdef _KERNEL_OPT
#include "opt_usb.h"
@@ -886,13 +886,16 @@
return 0;
}
- callout_stop(&sc->aue_stat_ch);
/*
- * Remove any pending tasks. They cannot be executing because they run
- * in the same thread as detach.
+ * XXX Halting callout guarantees no more tick tasks. What
+ * guarantees no more stop tasks? What guarantees no more
+ * calls to aue_send? Don't we need to wait for if_detach or
+ * something? Should we set sc->aue_dying here? Is device
+ * deactivation guaranteed to have already happened?
*/
- usb_rem_task(sc->aue_udev, &sc->aue_tick_task);
- usb_rem_task(sc->aue_udev, &sc->aue_stop_task);
+ callout_halt(&sc->aue_stat_ch, NULL);
+ usb_rem_task_wait(sc->aue_udev, &sc->aue_tick_task, USB_TASKQ_DRIVER);
+ usb_rem_task_wait(sc->aue_udev, &sc->aue_stop_task, USB_TASKQ_DRIVER);
sc->aue_closing = 1;
cv_signal(&sc->aue_domc);
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