mod_timer是一种高效的更新活动计时器超时时间的方法。如果计时器处于非活动状态，则会激活该计时器。等效于先删除计时器(del_timer)，设置新的超时时间(timer->expires = expires)，然后重新添加计时器(add_timer)。对于多个未序列化的并发用户使用同一计时器的情况，mod_timer是唯一安全的修改超时时间的方式。
Name
mod_timer — modify a timer's timeout
Synopsis
int fsfuncmod_timer ( | struct timer_list * timer, |
unsigned long expires); |
Description
mod_timer is a more efficient way to update the expire field of an active timer (if the timer is inactive it will be activated)
mod_timer(timer, expires) is equivalent to:
del_timer(timer); timer->expires = expires; add_timer(timer);
Note that if there are multiple unserialized concurrent users of the same timer, then mod_timer is the only safe way to modify the timeout, since add_timer cannot modify an already running timer.
The function returns whether it has modified a pending timer or not. (ie. mod_timer of an inactive timer returns 0, mod_timer of an active timer returns 1.)
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