usb: usbatm: Convert timers to use timer_setup()

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. Additionally corrects and on-stack
timer usage.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Duncan Sands <duncan.sands@free.fr>
Cc: "Gustavo A. R. Silva" <garsilva@embeddedor.com>
Cc: accessrunner-general@lists.sourceforge.net
Cc: linux-usb@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Allen Pais <allen.lkml@gmail.com>

3 files changed, 29 insertions, 20 deletions

diff --git a/drivers/usb/atm/cxacru.c b/drivers/usb/atm/cxacru.c
index 6470d259b7d8..8af797252af2 100644
--- a/drivers/usb/atm/cxacru.c
+++ b/drivers/usb/atm/cxacru.c
@@ -547,21 +547,30 @@ static void cxacru_blocking_completion(struct urb *urb)
         complete(urb->context);
 }
 
-static void cxacru_timeout_kill(unsigned long data)
+struct cxacru_timer {
+        struct timer_list timer;
+        struct urb *urb;
+};
+
+static void cxacru_timeout_kill(struct timer_list *t)
 {
-        usb_unlink_urb((struct urb *) data);
+        struct cxacru_timer *timer = from_timer(timer, t, timer);
+
+        usb_unlink_urb(timer->urb);
 }
 
 static int cxacru_start_wait_urb(struct urb *urb, struct completion *done,
                                  int *actual_length)
 {
-        struct timer_list timer;
+        struct cxacru_timer timer = {
+                .urb = urb,
+        };
 
-        setup_timer(&timer, cxacru_timeout_kill, (unsigned long)urb);
-        timer.expires = jiffies + msecs_to_jiffies(CMD_TIMEOUT);
-        add_timer(&timer);
+        timer_setup_on_stack(&timer.timer, cxacru_timeout_kill, 0);
+        mod_timer(&timer.timer, jiffies + msecs_to_jiffies(CMD_TIMEOUT));
         wait_for_completion(done);
-        del_timer_sync(&timer);
+        del_timer_sync(&timer.timer);
+        destroy_timer_on_stack(&timer.timer);
 
         if (actual_length)
                 *actual_length = urb->actual_length;
diff --git a/drivers/usb/atm/speedtch.c b/drivers/usb/atm/speedtch.c
index 5a5e8c0aaa39..973548b5c15c 100644
--- a/drivers/usb/atm/speedtch.c
+++ b/drivers/usb/atm/speedtch.c
@@ -557,9 +557,10 @@ static void speedtch_check_status(struct work_struct *work)
         }
 }
 
-static void speedtch_status_poll(unsigned long data)
+static void speedtch_status_poll(struct timer_list *t)
 {
-        struct speedtch_instance_data *instance = (void *)data;
+        struct speedtch_instance_data *instance = from_timer(instance, t,
+                                                             status_check_timer);
 
         schedule_work(&instance->status_check_work);
 
@@ -570,9 +571,10 @@ static void speedtch_status_poll(unsigned long data)
                 atm_warn(instance->usbatm, "Too many failures - disabling line status polling\n");
 }
 
-static void speedtch_resubmit_int(unsigned long data)
+static void speedtch_resubmit_int(struct timer_list *t)
 {
-        struct speedtch_instance_data *instance = (void *)data;
+        struct speedtch_instance_data *instance = from_timer(instance, t,
+                                                             resubmit_timer);
         struct urb *int_urb = instance->int_urb;
         int ret;
 
@@ -860,13 +862,11 @@ static int speedtch_bind(struct usbatm_data *usbatm,
         usbatm->flags |= (use_isoc ? UDSL_USE_ISOC : 0);
 
         INIT_WORK(&instance->status_check_work, speedtch_check_status);
-        setup_timer(&instance->status_check_timer, speedtch_status_poll,
-                    (unsigned long)instance);
+        timer_setup(&instance->status_check_timer, speedtch_status_poll, 0);
         instance->last_status = 0xff;
         instance->poll_delay = MIN_POLL_DELAY;
 
-        setup_timer(&instance->resubmit_timer, speedtch_resubmit_int,
-                    (unsigned long)instance);
+        timer_setup(&instance->resubmit_timer, speedtch_resubmit_int, 0);
 
         instance->int_urb = usb_alloc_urb(0, GFP_KERNEL);
 
diff --git a/drivers/usb/atm/usbatm.c b/drivers/usb/atm/usbatm.c
index 044264aa1f96..dbea28495e1d 100644
--- a/drivers/usb/atm/usbatm.c
+++ b/drivers/usb/atm/usbatm.c
@@ -989,18 +989,18 @@ static int usbatm_heavy_init(struct usbatm_data *instance)
         return 0;
 }
 
-static void usbatm_tasklet_schedule(unsigned long data)
+static void usbatm_tasklet_schedule(struct timer_list *t)
 {
-        tasklet_schedule((struct tasklet_struct *) data);
+        struct usbatm_channel *channel = from_timer(channel, t, delay);
+
+        tasklet_schedule(&channel->tasklet);
 }
 
 static void usbatm_init_channel(struct usbatm_channel *channel)
 {
         spin_lock_init(&channel->lock);
         INIT_LIST_HEAD(&channel->list);
-        channel->delay.function = usbatm_tasklet_schedule;
-        channel->delay.data = (unsigned long) &channel->tasklet;
-        init_timer(&channel->delay);
+        timer_setup(&channel->delay, usbatm_tasklet_schedule, 0);
 }
 
 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,