linux-kernel - [PATCH 1/3] thinkpad_acpi: return -NODEV while operating uninitialized LEDs

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Date:	Fri,  7 Jun 2013 16:20:07 +0800
From:	Adam Lee <adam.lee@...onical.com>
To:	linux-kernel@...r.kernel.org
Cc:	platform-driver-x86@...r.kernel.org,
	ibm-acpi-devel@...ts.sourceforge.net,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
	Alex Hung <alex.hung@...onical.com>, Bjorn Mork <bjorn@...k.no>
Subject: [PATCH 1/3] thinkpad_acpi: return -NODEV while operating uninitialized LEDs

Not all 0-15 LEDs are available for all models, sometimes it's even not
safe. This patch return -NODEV while operating uninitialized LEDs.

Signed-off-by: Adam Lee <adam.lee@...onical.com>
---
 drivers/platform/x86/thinkpad_acpi.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 54d31c0..bea57ae 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -5401,9 +5401,12 @@ static int led_write(char *buf)
 		return -ENODEV;
 
 	while ((cmd = next_cmd(&buf))) {
-		if (sscanf(cmd, "%d", &led) != 1 || led < 0 || led > 15)
+		if (sscanf(cmd, "%d", &led) != 1)
 			return -EINVAL;
 
+		if (!tpacpi_leds[led].led)
+			return -ENODEV;
+
 		if (strstr(cmd, "off")) {
 			s = TPACPI_LED_OFF;
 		} else if (strstr(cmd, "on")) {
-- 
1.7.10.4

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