[PATCH] net/lapb: Convert timers to use timer_setup()

From: Kees Cook
Date: Wed Oct 04 2017 - 21:08:31 EST


In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Hans Liljestrand <ishkamiel@xxxxxxxxx>
Cc: "Reshetova, Elena" <elena.reshetova@xxxxxxxxx>
Cc: linux-x25@xxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
This requires commit 686fef928bba ("timer: Prepare to change timer
callback argument type") in v4.14-rc3, but should be otherwise
stand-alone.
---
net/lapb/lapb_iface.c | 4 ++--
net/lapb/lapb_timer.c | 18 ++++++++----------
2 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/net/lapb/lapb_iface.c b/net/lapb/lapb_iface.c
index e15314e3b464..db6e0afe3a20 100644
--- a/net/lapb/lapb_iface.c
+++ b/net/lapb/lapb_iface.c
@@ -127,8 +127,8 @@ static struct lapb_cb *lapb_create_cb(void)
skb_queue_head_init(&lapb->write_queue);
skb_queue_head_init(&lapb->ack_queue);

- init_timer(&lapb->t1timer);
- init_timer(&lapb->t2timer);
+ timer_setup(&lapb->t1timer, NULL, 0);
+ timer_setup(&lapb->t2timer, NULL, 0);

lapb->t1 = LAPB_DEFAULT_T1;
lapb->t2 = LAPB_DEFAULT_T2;
diff --git a/net/lapb/lapb_timer.c b/net/lapb/lapb_timer.c
index 1a5535bc3b8d..8bb469cb3abe 100644
--- a/net/lapb/lapb_timer.c
+++ b/net/lapb/lapb_timer.c
@@ -35,15 +35,14 @@
#include <linux/interrupt.h>
#include <net/lapb.h>

-static void lapb_t1timer_expiry(unsigned long);
-static void lapb_t2timer_expiry(unsigned long);
+static void lapb_t1timer_expiry(struct timer_list *);
+static void lapb_t2timer_expiry(struct timer_list *);

void lapb_start_t1timer(struct lapb_cb *lapb)
{
del_timer(&lapb->t1timer);

- lapb->t1timer.data = (unsigned long)lapb;
- lapb->t1timer.function = &lapb_t1timer_expiry;
+ lapb->t1timer.function = (TIMER_FUNC_TYPE)lapb_t1timer_expiry;
lapb->t1timer.expires = jiffies + lapb->t1;

add_timer(&lapb->t1timer);
@@ -53,8 +52,7 @@ void lapb_start_t2timer(struct lapb_cb *lapb)
{
del_timer(&lapb->t2timer);

- lapb->t2timer.data = (unsigned long)lapb;
- lapb->t2timer.function = &lapb_t2timer_expiry;
+ lapb->t2timer.function = (TIMER_FUNC_TYPE)lapb_t2timer_expiry;
lapb->t2timer.expires = jiffies + lapb->t2;

add_timer(&lapb->t2timer);
@@ -75,9 +73,9 @@ int lapb_t1timer_running(struct lapb_cb *lapb)
return timer_pending(&lapb->t1timer);
}

-static void lapb_t2timer_expiry(unsigned long param)
+static void lapb_t2timer_expiry(struct timer_list *t)
{
- struct lapb_cb *lapb = (struct lapb_cb *)param;
+ struct lapb_cb *lapb = from_timer(lapb, t, t2timer);

if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
@@ -85,9 +83,9 @@ static void lapb_t2timer_expiry(unsigned long param)
}
}

-static void lapb_t1timer_expiry(unsigned long param)
+static void lapb_t1timer_expiry(struct timer_list *t)
{
- struct lapb_cb *lapb = (struct lapb_cb *)param;
+ struct lapb_cb *lapb = from_timer(lapb, t, t1timer);

switch (lapb->state) {

--
2.7.4


--
Kees Cook
Pixel Security