linux-kernel - [PATCH] Fix pattern handling optimalization

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Message-ID: <20181024204439.GA32300@amd>
Date:   Wed, 24 Oct 2018 22:44:39 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     Baolin Wang <baolin.wang@...aro.org>, rteysseyre@...il.com,
        bjorn.andersson@...aro.org, broonie@...nel.org,
        linus.walleij@...aro.org, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] Fix pattern handling optimalization


Check for zero duration before skipping step. This fixes pattern
    
    echo "0 1000 10 2550 0 1000" > pattern
    
which should do [  .-xXx-.] but does [   Xx-.]
    
Signed-off-by: Pavel Machek <pavel@....cz>
Suggested-by: Jacek Anaszewski <jacek.anaszewski@...il.com>


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
@@ -87,9 +87,10 @@ static void pattern_trig_timer_function(struct timer_list *t)
 					   data->curr->brightness);
 			mod_timer(&data->timer,
 				  jiffies + msecs_to_jiffies(data->curr->delta_t));
-
-			/* Skip the tuple with zero duration */
-			pattern_trig_update_patterns(data);
+			if (!data->next->delta_t) {
+				/* Skip the tuple with zero duration */
+				pattern_trig_update_patterns(data);
+			}
 			/* Select next tuple */
 			pattern_trig_update_patterns(data);
 		} else {

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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