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net: lapb: Make "lapb_t1timer_running" able to detect an already running timer

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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>
This commit is contained in:
Xie He 2021-03-21 02:39:35 -07:00 committed by David S. Miller
parent 1ab568e92b
commit 65d2dbb300
3 changed files with 15 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/lapb.h
View File

@ -92,7 +92,7 @@ struct lapb_cb {
unsigned short n2, n2count;
unsigned short t1, t2;
struct timer_list t1timer, t2timer;
bool t1timer_stop, t2timer_stop;
bool t1timer_running, t2timer_running;
/* Internal control information */
struct sk_buff_head write_queue;

4
net/lapb/lapb_iface.c
View File

@ -122,8 +122,8 @@ static struct lapb_cb *lapb_create_cb(void)
timer_setup(&lapb->t1timer, NULL, 0);
timer_setup(&lapb->t2timer, NULL, 0);
lapb->t1timer_stop = true;
lapb->t2timer_stop = true;
lapb->t1timer_running = false;
lapb->t2timer_running = false;
lapb->t1 = LAPB_DEFAULT_T1;
lapb->t2 = LAPB_DEFAULT_T2;

19
net/lapb/lapb_timer.c
View File

@ -40,7 +40,7 @@ void lapb_start_t1timer(struct lapb_cb *lapb)
lapb->t1timer.function = lapb_t1timer_expiry;
lapb->t1timer.expires = jiffies + lapb->t1;
lapb->t1timer_stop = false;
lapb->t1timer_running = true;
add_timer(&lapb->t1timer);
}
@ -51,25 +51,25 @@ void lapb_start_t2timer(struct lapb_cb *lapb)
lapb->t2timer.function = lapb_t2timer_expiry;
lapb->t2timer.expires = jiffies + lapb->t2;
lapb->t2timer_stop = false;
lapb->t2timer_running = true;
add_timer(&lapb->t2timer);
}
void lapb_stop_t1timer(struct lapb_cb *lapb)
{
lapb->t1timer_stop = true;
lapb->t1timer_running = false;
del_timer(&lapb->t1timer);
}
void lapb_stop_t2timer(struct lapb_cb *lapb)
{
lapb->t2timer_stop = true;
lapb->t2timer_running = false;
del_timer(&lapb->t2timer);
}
int lapb_t1timer_running(struct lapb_cb *lapb)
{
return timer_pending(&lapb->t1timer);
return lapb->t1timer_running;
}
static void lapb_t2timer_expiry(struct timer_list *t)
@ -79,13 +79,14 @@ static void lapb_t2timer_expiry(struct timer_list *t)
spin_lock_bh(&lapb->lock);
if (timer_pending(&lapb->t2timer)) /* A new timer has been set up */
goto out;
if (lapb->t2timer_stop) /* The timer has been stopped */
if (!lapb->t2timer_running) /* The timer has been stopped */
goto out;
if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
lapb_timeout_response(lapb);
}
lapb->t2timer_running = false;
out:
spin_unlock_bh(&lapb->lock);
@ -98,7 +99,7 @@ static void lapb_t1timer_expiry(struct timer_list *t)
spin_lock_bh(&lapb->lock);
if (timer_pending(&lapb->t1timer)) /* A new timer has been set up */
goto out;
if (lapb->t1timer_stop) /* The timer has been stopped */
if (!lapb->t1timer_running) /* The timer has been stopped */
goto out;
switch (lapb->state) {
@ -127,6 +128,7 @@ static void lapb_t1timer_expiry(struct timer_list *t)
lapb->state = LAPB_STATE_0;
lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev);
lapb->t1timer_running = false;
goto out;
} else {
lapb->n2count++;
@ -151,6 +153,7 @@ static void lapb_t1timer_expiry(struct timer_list *t)
lapb->state = LAPB_STATE_0;
lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev);
lapb->t1timer_running = false;
goto out;
} else {
lapb->n2count++;
@ -169,6 +172,7 @@ static void lapb_t1timer_expiry(struct timer_list *t)
lapb_stop_t2timer(lapb);
lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev);
lapb->t1timer_running = false;
goto out;
} else {
lapb->n2count++;
@ -186,6 +190,7 @@ static void lapb_t1timer_expiry(struct timer_list *t)
lapb->state = LAPB_STATE_0;
lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
lapb_dbg(0, "(%p) S4 -> S0\n", lapb->dev);
lapb->t1timer_running = false;
goto out;
} else {
lapb->n2count++;