[src/trunk]: src/sys/dev ipmi(4): Tidy up ipmi_thread a little.

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

details:   https://anonhg.NetBSD.org/src/rev/3bda176900f8
branches:  trunk
changeset: 1021723:3bda176900f8
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Tue Jun 15 00:20:33 2021 +0000

description:
ipmi(4): Tidy up ipmi_thread a little.

- Join on detach -- don't free anything until thread has exited; thread
  may still be using stuff.
- Nix dead error branch -- malloc(M_WAITOK) cannot fail.
- x = malloc(sizeof(x[0]) * n), not x = malloc(sizeof(type_t) * n)

diffstat:

 sys/dev/ipmi.c |  17 +++++++----------
 1 files changed, 7 insertions(+), 10 deletions(-)

diffs (52 lines):

diff -r a3d645fa0c8b -r 3bda176900f8 sys/dev/ipmi.c
--- a/sys/dev/ipmi.c    Mon Jun 14 22:00:10 2021 +0000
+++ b/sys/dev/ipmi.c    Tue Jun 15 00:20:33 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ipmi.c,v 1.8 2021/06/14 22:00:10 riastradh Exp $ */
+/*     $NetBSD: ipmi.c,v 1.9 2021/06/15 00:20:33 riastradh Exp $ */
 
 /*
  * Copyright (c) 2019 Michael van Elst
@@ -76,7 +76,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ipmi.c,v 1.8 2021/06/14 22:00:10 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ipmi.c,v 1.9 2021/06/15 00:20:33 riastradh Exp $");
 
 #include <sys/types.h>
 #include <sys/param.h>
@@ -1984,13 +1984,8 @@
                        break;
 
        /* allocate and fill sensor arrays */
-       sc->sc_sensor =
-           malloc(sizeof(envsys_data_t) * sc->sc_nsensors,
-               M_DEVBUF, M_WAITOK | M_ZERO);
-       if (sc->sc_sensor == NULL) {
-               aprint_error_dev(self, "can't allocate envsys_data_t\n");
-               kthread_exit(0);
-       }
+       sc->sc_sensor = malloc(sizeof(sc->sc_sensor[0]) * sc->sc_nsensors,
+           M_DEVBUF, M_WAITOK | M_ZERO);
 
        sc->sc_envsys = sysmon_envsys_create();
        sc->sc_envsys->sme_cookie = sc;
@@ -2132,7 +2127,7 @@
        cv_init(&sc->sc_poll_cv, "ipmipoll");
        cv_init(&sc->sc_mode_cv, "ipmimode");
 
-       if (kthread_create(PRI_NONE, 0, NULL, ipmi_thread, self,
+       if (kthread_create(PRI_NONE, KTHREAD_MUSTJOIN, NULL, ipmi_thread, self,
            &sc->sc_kthread, "%s", device_xname(self)) != 0) {
                aprint_error_dev(self, "unable to create thread, disabled\n");
        } else
@@ -2150,6 +2145,8 @@
        sc->sc_thread_running = false;
        cv_signal(&sc->sc_poll_cv);
        mutex_exit(&sc->sc_poll_mtx);
+       if (sc->sc_kthread)
+               (void)kthread_join(sc->sc_kthread);
 
        if ((rc = sysmon_wdog_unregister(&sc->sc_wdog)) != 0) {
                if (rc == ERESTART)