linux-kernel - [PATCH] Input: LEDs

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Date:	Wed, 22 Jul 2015 15:02:02 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Pavel Machek <pavel@....cz>, Vlastimil Babka <vbabka@...e.cz>,
	Jiri Kosina <jkosina@...e.com>
Cc:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	Pali Rohár <pali.rohar@...il.com>,
	linux-input@...r.kernel.org, rpurdie@...ys.net,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Input: LEDs - skip unnamed LEDs

Devices may declare more LEDs than what is known to input-leds
(HID does this for some devices). Instead of showing ugly warnings
on connect and, even worse, oopsing on disconnect, let's simply
ignore LEDs that are not known to us.

Reported-by: Vlastimil Babka <vbabka@...e.cz>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/input/input-leds.c |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/input/input-leds.c b/drivers/input/input-leds.c
index 074a65e..766bf26 100644
--- a/drivers/input/input-leds.c
+++ b/drivers/input/input-leds.c
@@ -71,6 +71,18 @@ static void input_leds_event(struct input_handle *handle, unsigned int type,
 {
 }
 
+static int input_leds_get_count(struct input_dev *dev)
+{
+	unsigned int led_code;
+	int count = 0;
+
+	for_each_set_bit(led_code, dev->ledbit, LED_CNT)
+		if (input_led_info[led_code].name)
+			count++;
+
+	return count;
+}
+
 static int input_leds_connect(struct input_handler *handler,
 			      struct input_dev *dev,
 			      const struct input_device_id *id)
@@ -81,7 +93,7 @@ static int input_leds_connect(struct input_handler *handler,
 	int led_no;
 	int error;
 
-	num_leds = bitmap_weight(dev->ledbit, LED_CNT);
+	num_leds = input_leds_get_count(dev);
 	if (!num_leds)
 		return -ENXIO;
 
@@ -112,7 +124,7 @@ static int input_leds_connect(struct input_handler *handler,
 		led->handle = &leds->handle;
 		led->code = led_code;
 
-		if (WARN_ON(!input_led_info[led_code].name))
+		if (!input_led_info[led_code].name)
 			continue;
 
 		led->cdev.name = kasprintf(GFP_KERNEL, "%s::%s",

-- 
Dmitry
--
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