From: Jacek Anaszewski <jacek.anaszewski@gmail.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Baolin Wang <baolin.wang@linaro.org>,
rteysseyre@gmail.com, bjorn.andersson@linaro.org,
broonie@kernel.org, linus.walleij@linaro.org,
linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: More checks for patterns? was: Fix pattern handling optimalization
Date: Fri, 26 Oct 2018 21:56:51 +0200 [thread overview]
Message-ID: <216b2cb8-dd3e-6849-8643-ab5aef92c7a8@gmail.com> (raw)
In-Reply-To: <20181025212429.GB18016@amd>
On 10/25/2018 11:24 PM, Pavel Machek wrote:
>
> We don't want brightness < 0, but this may not be best way to do
> this. We also don't want brightness > max_brightness, but I'm not sure
> this check is effective.
>
> We probably also don't want pattern where all the delta_t s are zero.
>
> I came up with this so far....
> Pavel
>
>
>
> diff --git a/drivers/leds/trigger/ledtrig-pattern.c b/drivers/leds/trigger/ledtrig-pattern.c
> index ce7acd1..bc5f495 100644
> --- a/drivers/leds/trigger/ledtrig-pattern.c
> +++ b/drivers/leds/trigger/ledtrig-pattern.c
> @@ -250,9 +251,16 @@ static ssize_t pattern_trig_store_patterns(struct led_classdev *led_cdev,
>
> while (offset < count - 1 && data->npatterns < MAX_PATTERNS) {
> cr = 0;
> - ccount = sscanf(buf + offset, "%d %u %n",
> + ccount = sscanf(buf + offset, "%u %u %n",
> &data->patterns[data->npatterns].brightness,
> &data->patterns[data->npatterns].delta_t, &cr);
> +
> + if (data->patterns[data->npatterns].brightness > data->led_cdev->max_brightness) {
> + data->npatterns = 0;
> + err = -EINVAL;
We don't fail on attempt of setting brightness > max_brightness, but
only truncate it. In this case we could do the same for consistency.
> + goto out;
> + }
> +
> if (ccount != 2) {
> data->npatterns = 0;
> err = -EINVAL;
>
>
>
>
--
Best regards,
Jacek Anaszewski
prev parent reply other threads:[~2018-10-26 19:57 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-11 4:07 [PATCH v15 1/2] leds: core: Introduce LED pattern trigger Baolin Wang
2018-10-11 4:07 ` [PATCH v15 2/2] leds: sc27xx: Add pattern_set/clear interfaces for LED controller Baolin Wang
2018-10-11 20:07 ` [PATCH v15 1/2] leds: core: Introduce LED pattern trigger Jacek Anaszewski
2018-10-12 1:40 ` Baolin Wang
2018-10-24 8:34 ` Pavel Machek
2018-10-24 8:31 ` Pavel Machek
2018-10-24 19:17 ` Jacek Anaszewski
2018-10-24 19:55 ` Pavel Machek
2018-10-24 20:44 ` [PATCH] Fix pattern handling optimalization Pavel Machek
2018-10-25 19:17 ` Jacek Anaszewski
2018-10-25 21:24 ` More checks for patterns? was: " Pavel Machek
2018-10-26 8:02 ` Baolin Wang
2018-10-26 19:56 ` Jacek Anaszewski [this message]
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