linux-kernel - Re: [PATCH 11/13] input: lm8323: fix attribute-creation race

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Date:	Fri, 27 Jun 2014 11:50:23 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Johan Hovold <johan@...nel.org>
Cc:	Bryan Wu <cooloney@...il.com>, Richard Purdie <rpurdie@...ys.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>, linux-leds@...r.kernel.org,
	Janne Kanniainen <janne.kanniainen@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Bjørn Mork <bjorn@...k.no>
Subject: Re: [PATCH 11/13] input: lm8323: fix attribute-creation race

On Wed, Jun 25, 2014 at 10:08 AM, Johan Hovold <johan@...nel.org> wrote:
> Use the attribute groups of the led-class to create the time attribute
> during probe in order to avoid racing with userspace.
>
> Signed-off-by: Johan Hovold <johan@...nel.org>

Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

> ---
>  drivers/input/keyboard/lm8323.c | 22 +++++++++-------------
>  1 file changed, 9 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/input/keyboard/lm8323.c b/drivers/input/keyboard/lm8323.c
> index 0b42118cbf8f..cb32e2b506b7 100644
> --- a/drivers/input/keyboard/lm8323.c
> +++ b/drivers/input/keyboard/lm8323.c
> @@ -558,6 +558,12 @@ static ssize_t lm8323_pwm_store_time(struct device *dev,
>  }
>  static DEVICE_ATTR(time, 0644, lm8323_pwm_show_time, lm8323_pwm_store_time);
>
> +static struct attribute *lm8323_pwm_attrs[] = {
> +       &dev_attr_time.attr,
> +       NULL
> +};
> +ATTRIBUTE_GROUPS(lm8323_pwm);
> +
>  static int init_pwm(struct lm8323_chip *lm, int id, struct device *dev,
>                     const char *name)
>  {
> @@ -580,16 +586,11 @@ static int init_pwm(struct lm8323_chip *lm, int id, struct device *dev,
>         if (name) {
>                 pwm->cdev.name = name;
>                 pwm->cdev.brightness_set = lm8323_pwm_set_brightness;
> +               pwm->cdev.groups = lm8323_pwm_groups;
>                 if (led_classdev_register(dev, &pwm->cdev) < 0) {
>                         dev_err(dev, "couldn't register PWM %d\n", id);
>                         return -1;
>                 }
> -               if (device_create_file(pwm->cdev.dev,
> -                                       &dev_attr_time) < 0) {
> -                       dev_err(dev, "couldn't register time attribute\n");
> -                       led_classdev_unregister(&pwm->cdev);
> -                       return -1;
> -               }
>                 pwm->enabled = true;
>         }
>
> @@ -753,11 +754,8 @@ fail3:
>         device_remove_file(&client->dev, &dev_attr_disable_kp);
>  fail2:
>         while (--pwm >= 0)
> -               if (lm->pwm[pwm].enabled) {
> -                       device_remove_file(lm->pwm[pwm].cdev.dev,
> -                                          &dev_attr_time);
> +               if (lm->pwm[pwm].enabled)
>                         led_classdev_unregister(&lm->pwm[pwm].cdev);
> -               }
>  fail1:
>         input_free_device(idev);
>         kfree(lm);
> @@ -777,10 +775,8 @@ static int lm8323_remove(struct i2c_client *client)
>         device_remove_file(&lm->client->dev, &dev_attr_disable_kp);
>
>         for (i = 0; i < 3; i++)
> -               if (lm->pwm[i].enabled) {
> -                       device_remove_file(lm->pwm[i].cdev.dev, &dev_attr_time);
> +               if (lm->pwm[i].enabled)
>                         led_classdev_unregister(&lm->pwm[i].cdev);
> -               }
>
>         kfree(lm);
>
> --
> 1.8.5.5
>

Thanks.

-- 
Dmitry
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