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Problem: The "lapb_t1timer_running" function in "lapb_timer.c" is used in only one place: in the "lapb_kick" function in "lapb_out.c". "lapb_kick" calls "lapb_t1timer_running" to check if the timer is already pending, and if it is not, schedule it to run. However, if the timer has already fired and is running, and is waiting to get the "lapb->lock" lock, "lapb_t1timer_running" will not detect this, and "lapb_kick" will then schedule a new timer. The old timer will then abort when it sees a new timer pending. I think this is not right. The purpose of "lapb_kick" should be ensuring that the actual work of the timer function is scheduled to be done. If the timer function is already running but waiting for the lock, "lapb_kick" should not abort and reschedule it. Changes made: I added a new field "t1timer_running" in "struct lapb_cb" for "lapb_t1timer_running" to use. "t1timer_running" will accurately reflect whether the actual work of the timer is pending. If the timer has fired but is still waiting for the lock, "t1timer_running" will still correctly reflect whether the actual work is waiting to be done. The old "t1timer_stop" field, whose only responsibility is to ask a timer (that is already running but waiting for the lock) to abort, is no longer needed, because the new "t1timer_running" field can fully take over its responsibility. Therefore "t1timer_stop" is deleted. "t1timer_running" is not simply a negation of the old "t1timer_stop". At the end of the timer function, if it does not reschedule itself, "t1timer_running" is set to false to indicate that the timer is stopped. For consistency of the code, I also added "t2timer_running" and deleted "t2timer_stop". Signed-off-by: Xie He <xie.he.0141@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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