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[PATCH] hrtimers: fixup itimer conversion

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The itimer conversion removed the locking which protects the timer and
variables in the shared signal structure.  Steven Rostedt found the problem in
the latest -rt patches.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Thomas Gleixner 2006-02-01 03:05:08 -08:00 committed by Linus Torvalds
parent 853609b61e
commit bc1978d404
1 changed files with 10 additions and 1 deletions
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11
kernel/itimer.c
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@ -49,9 +49,11 @@ int do_getitimer(int which, struct itimerval *value)
switch (which) { switch (which) {
case ITIMER_REAL: case ITIMER_REAL:
spin_lock_irq(&tsk->sighand->siglock);
value->it_value = itimer_get_remtime(&tsk->signal->real_timer); value->it_value = itimer_get_remtime(&tsk->signal->real_timer);
value->it_interval = value->it_interval =
ktime_to_timeval(tsk->signal->it_real_incr); ktime_to_timeval(tsk->signal->it_real_incr);
spin_unlock_irq(&tsk->sighand->siglock);
break; break;
case ITIMER_VIRTUAL: case ITIMER_VIRTUAL:
read_lock(&tasklist_lock); read_lock(&tasklist_lock);
@ -150,8 +152,14 @@ int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
switch (which) { switch (which) {
case ITIMER_REAL: case ITIMER_REAL:
again:
spin_lock_irq(&tsk->sighand->siglock);
timer = &tsk->signal->real_timer; timer = &tsk->signal->real_timer;
hrtimer_cancel(timer); /* We are sharing ->siglock with it_real_fn() */
if (hrtimer_try_to_cancel(timer) < 0) {
spin_unlock_irq(&tsk->sighand->siglock);
goto again;
}
if (ovalue) { if (ovalue) {
ovalue->it_value = itimer_get_remtime(timer); ovalue->it_value = itimer_get_remtime(timer);
ovalue->it_interval ovalue->it_interval
@ -162,6 +170,7 @@ int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
expires = timeval_to_ktime(value->it_value); expires = timeval_to_ktime(value->it_value);
if (expires.tv64 != 0) if (expires.tv64 != 0)
hrtimer_start(timer, expires, HRTIMER_REL); hrtimer_start(timer, expires, HRTIMER_REL);
spin_unlock_irq(&tsk->sighand->siglock);
break; break;
case ITIMER_VIRTUAL: case ITIMER_VIRTUAL:
nval = timeval_to_cputime(&value->it_value); nval = timeval_to_cputime(&value->it_value);