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posix timers: timer_delete: remove the bogus "->it_process != NULL" check

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sys_timer_delete() and itimer_delete() check "timer->it_process != NULL",
this looks completely bogus.  ->it_process == NULL means that this timer
is already under destruction or it is not fully initialized, this must not
happen.

	sys_timer_delete: the timer is locked, and lock_timer() can't succeed
	if ->it_process == NULL.

	itimer_delete: it is called by exit_itimers() when there are no other
	threads which can play with signal_struct->posix_timers.

Signed-off-by: Oleg Nesterov <[email protected]>
Acked-by: Roland McGrath <[email protected]>
Cc: john stultz <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Roland McGrath <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Oleg Nesterov 2008-07-25 01:47:26 -07:00 • committed by Linus Torvalds
commit 4b7a130426
1 changed files with 8 additions and 10 deletions
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18
kernel/posix-timers.c
View file

@ -856,11 +856,10 @@ retry_delete:
* This keeps any tasks waiting on the spin lock from thinking
* they got something (see the lock code above).
*/
if (timer->it_process) {
if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
put_task_struct(timer->it_process);
timer->it_process = NULL;
}
if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
put_task_struct(timer->it_process);
timer->it_process = NULL;
unlock_timer(timer, flags);
release_posix_timer(timer, IT_ID_SET);
return 0;
@ -885,11 +884,10 @@ retry_delete:
* This keeps any tasks waiting on the spin lock from thinking
* they got something (see the lock code above).
*/
if (timer->it_process) {
if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
put_task_struct(timer->it_process);
timer->it_process = NULL;
}
if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
put_task_struct(timer->it_process);
timer->it_process = NULL;
unlock_timer(timer, flags);
release_posix_timer(timer, IT_ID_SET);
}