On Fri, 07 Jun 2013, Adam Lee wrote:
> 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@xxxxxxxxxxxxx>
Acked-by: Henrique de Moraes Holschuh <hmh@xxxxxxxxxx>
> ---
> 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")) {
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
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