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posix-timers: always do get_task_struct(timer->it_process) 

Change the code to get/put timer->it_process regardless of
SIGEV_THREAD_ID.  This streamlines the create/destroy paths and allows us
to simplify the usage of exit_itimers() in de_thread().

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>
This commit is contained in:
Oleg Nesterov 2008-09-22 14:42:46 -07:00 committed by Thomas Gleixner
parent 4aa7361179
commit 918fc03728
1 changed files with 4 additions and 6 deletions
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10
kernel/posix-timers.c
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@ -540,11 +540,10 @@ sys_timer_create(const clockid_t which_clock,
*/
spin_lock_irqsave(&process->sighand->siglock, flags);
if (!(process->flags & PF_EXITING)) {
get_task_struct(process);
new_timer->it_process = process;
list_add(&new_timer->list,
&process->signal->posix_timers);
if (new_timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
get_task_struct(process);
spin_unlock_irqrestore(&process->sighand->siglock, flags);
} else {
spin_unlock_irqrestore(&process->sighand->siglock, flags);
@ -561,6 +560,7 @@ sys_timer_create(const clockid_t which_clock,
new_timer->it_sigev_signo = SIGALRM;
new_timer->it_sigev_value.sival_int = new_timer->it_id;
process = current->group_leader;
get_task_struct(process);
spin_lock_irqsave(&process->sighand->siglock, flags);
new_timer->it_process = process;
list_add(&new_timer->list, &process->signal->posix_timers);
@ -853,8 +853,7 @@ retry_delete:
* This keeps any tasks waiting on the spin lock from thinking
* they got something (see the lock code above).
*/
if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
put_task_struct(timer->it_process);
put_task_struct(timer->it_process);
timer->it_process = NULL;
unlock_timer(timer, flags);
@ -881,8 +880,7 @@ retry_delete:
* This keeps any tasks waiting on the spin lock from thinking
* they got something (see the lock code above).
*/
if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
put_task_struct(timer->it_process);
put_task_struct(timer->it_process);
timer->it_process = NULL;
unlock_timer(timer, flags);