linux-kernel - Re: [PATCH 1/1] driver:garmin gps: use setup

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Date:   Mon, 9 Oct 2017 09:34:05 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Allen Pais <allen.lkml@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 1/1] driver:garmin gps: use setup_timer

On Mon, Oct 9, 2017 at 6:59 AM, Johan Hovold <johan@...nel.org> wrote:
> On Thu, Sep 21, 2017 at 04:54:24PM +0530, Allen Pais wrote:
>>     Use setup_timer function instead of initializing timer with the
>>     function and data fields.
>
> Why the odd indentation here?
>
>> Signed-off-by: Allen Pais <allen.lkml@...il.com>
>> ---
>>  drivers/usb/serial/garmin_gps.c | 5 ++---
>>  1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/usb/serial/garmin_gps.c b/drivers/usb/serial/garmin_gps.c
>> index b2f2e87..2dbc1bed 100644
>> --- a/drivers/usb/serial/garmin_gps.c
>> +++ b/drivers/usb/serial/garmin_gps.c
>> @@ -1391,12 +1391,11 @@ static int garmin_port_probe(struct usb_serial_port *port)
>>       if (!garmin_data_p)
>>               return -ENOMEM;
>>
>> -     init_timer(&garmin_data_p->timer);
>> +     setup_timer(&garmin_data_p->timer, timeout_handler,
>> +                 (unsigned long)garmin_data_p);
>>       spin_lock_init(&garmin_data_p->lock);
>>       INIT_LIST_HEAD(&garmin_data_p->pktlist);
>>       /* garmin_data_p->timer.expires = jiffies + session_timeout; */
>> -     garmin_data_p->timer.data = (unsigned long)garmin_data_p;
>> -     garmin_data_p->timer.function = timeout_handler;
>>       garmin_data_p->port = port;
>>       garmin_data_p->state = 0;
>>       garmin_data_p->flags = 0;
>
> Kees submitted the exact same change the day before you as part of a
> larger patch resulting from running coccinelle and replacing all
> open-coded versions of setup_timer in go, something which seems
> preferable.
>
> Not sure who is expected to pick that patch up, but I'll hold off on
> this one for a while still waiting to see what happens to Kees's series.

Hi, actually, "setup_timer" is the old api ("init_timer" is the
ancient api), "timer_setup" (to match hrtimer_setup) is the current
future approach here...

-Kees

-- 
Kees Cook
Pixel Security