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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2008-09-22 14:42:51 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-09-24 15:45:48 +0200 |
| commit | 5a51b713ccf8835d5adf7217e2f86eb12b1ca851 (patch) | |
| tree | b5c67c0252bcbd5d8df9b10e9fd306d79e53e8b1 /kernel/posix-timers.c | |
| parent | 5a9fa73072854981a5c05eb7ba18a96d49c2804f (diff) | |
| download | linux-5a51b713ccf8835d5adf7217e2f86eb12b1ca851.tar.gz | |
posix-timers: lock_timer: kill the bogus ->it_id check
lock_timer() checks that the timer found by idr_find(timer_id) has ->it_id == timer_id. This buys nothing. This check can fail only if sys_timer_create() unlocked idr_lock after idr_get_new(), but didn't set ->it_id = new_timer_id yet. But in that case ->it_process == NULL so lock_timer() can't succeed anyway. Also remove a couple of unneeded typecasts. Note that with or without this patch we have a small problem. sys_timer_create() doesn't ensure that the result of setting (say) ->it_sigev_notify must be visible if lock_timer() succeeds. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: mingo@elte.hu Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/posix-timers.c')
| -rw-r--r-- | kernel/posix-timers.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c index 3eff47b0d8d5..7185f05d53a9 100644 --- a/kernel/posix-timers.c +++ b/kernel/posix-timers.c @@ -474,8 +474,7 @@ sys_timer_create(const clockid_t which_clock, goto out; } spin_lock_irq(&idr_lock); - error = idr_get_new(&posix_timers_id, (void *) new_timer, - &new_timer_id); + error = idr_get_new(&posix_timers_id, new_timer, &new_timer_id); spin_unlock_irq(&idr_lock); if (error) { if (error == -EAGAIN) @@ -567,12 +566,12 @@ static struct k_itimer * lock_timer(timer_t timer_id, unsigned long *flags) */ spin_lock_irqsave(&idr_lock, *flags); - timr = (struct k_itimer *) idr_find(&posix_timers_id, (int) timer_id); + timr = idr_find(&posix_timers_id, (int) timer_id); if (timr) { spin_lock(&timr->it_lock); - if ((timr->it_id != timer_id) || !(timr->it_process) || - !same_thread_group(timr->it_process, current)) { + if (!timr->it_process || + !same_thread_group(timr->it_process, current)) { spin_unlock(&timr->it_lock); spin_unlock_irqrestore(&idr_lock, *flags); timr = NULL; |