On Sat, Jun 07, 2014 at 01:12:39PM +0300, Janne Kanniainen wrote:
> > First of all, please reply to the original thread and make sure to not
> > drop people or lists from CC.
>
> Sorry this is my first patch and i didn't know that. Now I know.
>
> > For arrays you can use the ARRAY_SIZE() macro if that was the reason for
> > this change. I should have mentioned that when I pointed out that you
> > cannot use strlen().
>
> That wasn't the reason. I just thought it might be better to use u64
> than char[8]. I know why I can't use strlen and that was only careless
> error. And there was lot of them :( I will be more careful next time.
No problem, that's what review is for, and the second version was much
cleaner even if there were still a few issues (some hard to know about,
such as the DMA from stack issue, which is also a very common error).
> > Where did you get these (HID report) values from by the way?
>
> I got them by reverse engineering.
Traffic sniffing?
> >> +
> >> +static void gt683r_brightness_set(struct led_classdev *led_cdev,
> >> + enum led_brightness brightness)
> >> +{
> >> + struct gt683r_led *led =
> >> + container_of(led_cdev, struct gt683r_led, led_dev);
> >> +
> >> + mutex_lock(&led->lock);
> >
> > You cannot grab a mutex here since this function can be called from
> > interrupt context (if I remember correctly). Either way, you shouldn't
> > be holding the lock until the work task has finished...
>
> I thought use asked me to put some lock there:
>
> >> +
> >> +static void gt683r_brightness_set(struct led_classdev *led_cdev,
> >> + enum led_brightness brightness)
> >> +{
> >> + struct gt683r_led *led =
> >> + container_of(led_cdev, struct gt683r_led, led_dev);
> >> +
> >> + led->brightness = brightness;
> >
> > Missing locking?
I asked if locking was missing and did not specify how you should be
adding it. ;)
In fact, it seems you can get away with not adding any locking here.
Just do the (mutex) locking in gt683r_led_set (or gt683r_led_work).
Johan
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