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. Moves timer structure off stack and into struct ips_driver.
Cc: Darren Hart <[email protected]> Cc: Andy Shevchenko <[email protected]> Cc: [email protected] Cc: Thomas Gleixner <[email protected]> Signed-off-by: Kees Cook <[email protected]> --- This requires commit 686fef928bba ("timer: Prepare to change timer callback argument type") in v4.14-rc3, but should be otherwise stand-alone. --- drivers/platform/x86/intel_ips.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/drivers/platform/x86/intel_ips.c b/drivers/platform/x86/intel_ips.c index 58dcee562d64..056afb731d79 100644 --- a/drivers/platform/x86/intel_ips.c +++ b/drivers/platform/x86/intel_ips.c @@ -300,6 +300,7 @@ struct ips_driver { struct task_struct *monitor; struct task_struct *adjust; struct dentry *debug_root; + struct timer_list timer; /* Average CPU core temps (all averages in .01 degrees C for precision) */ u16 ctv1_avg_temp; @@ -942,9 +943,10 @@ static u32 calc_avg_power(struct ips_driver *ips, u32 *array) return avg; } -static void monitor_timeout(unsigned long arg) +static void monitor_timeout(struct timer_list *t) { - wake_up_process((struct task_struct *)arg); + struct ips_driver *ips = from_timer(ips, t, timer); + wake_up_process(ips->monitor); } /** @@ -961,7 +963,6 @@ static void monitor_timeout(unsigned long arg) static int ips_monitor(void *data) { struct ips_driver *ips = data; - struct timer_list timer; unsigned long seqno_timestamp, expire, last_msecs, last_sample_period; int i; u32 *cpu_samples, *mchp_samples, old_cpu_power; @@ -1049,8 +1050,7 @@ static int ips_monitor(void *data) schedule_timeout_interruptible(msecs_to_jiffies(IPS_SAMPLE_PERIOD)); last_sample_period = IPS_SAMPLE_PERIOD; - setup_deferrable_timer_on_stack(&timer, monitor_timeout, - (unsigned long)current); + timer_setup(&ips->timer, monitor_timeout, TIMER_DEFERRABLE); do { u32 cpu_val, mch_val; u16 val; @@ -1107,7 +1107,7 @@ static int ips_monitor(void *data) expire = jiffies + msecs_to_jiffies(IPS_SAMPLE_PERIOD); __set_current_state(TASK_INTERRUPTIBLE); - mod_timer(&timer, expire); + mod_timer(&ips->timer, expire); schedule(); /* Calculate actual sample period for power averaging */ @@ -1116,8 +1116,7 @@ static int ips_monitor(void *data) last_sample_period = 1; } while (!kthread_should_stop()); - del_timer_sync(&timer); - destroy_timer_on_stack(&timer); + del_timer_sync(&ips->timer); dev_dbg(&ips->dev->dev, "ips-monitor thread stopped\n"); -- 2.7.4 -- Kees Cook Pixel Security
