posix-timers: lock_timer: kill the bogus ->it_id check

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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>

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Oleg Nesterov 2008-09-22 14:42:51 -07:00 • committed by Thomas Gleixner

parent 5a9fa73072

commit 5a51b713cc

1 changed files with 4 additions and 5 deletions

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kernel/posix-timers.c

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