linux-kernel - Re: [PATCH v2] thinkpad_acpi: return -NODEV while operating uninitialized LEDs

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Date:	Sat, 8 Jun 2013 10:19:18 +0800
From:	Amos Kong <kongjianjun@...il.com>
To:	Adam Lee <adam.lee@...onical.com>
Cc:	linux-kernel@...r.kernel.org, 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: Re: [PATCH v2] thinkpad_acpi: return -NODEV while operating
 uninitialized LEDs

On Fri, Jun 7, 2013 at 5:05 PM, Adam Lee <adam.lee@...onical.com> 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@...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..d2ac4e8 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 || led < 0 || led > (TPACPI_LED_NUMLEDS -1))
>                         return -EINVAL;
>
> +               if (!tpacpi_leds[led].led)


The .led filed might be set to '0' in led_init(), how about set the
uninitiated .led to -1? and check by "if (tpacpi_leds[led].led < 0)"

        for (i = 0; i < TPACPI_LED_NUMLEDS; i++) {
                if (!tpacpi_is_led_restricted(i) &&
                    test_bit(i, &useful_leds)) {
                        rc = tpacpi_init_led(i);
                        if (rc < 0) {
                                led_exit();
                                return rc;
-                       }
+                       } else
+                               tpacpi_leds[led].led = -1;

                } else tpacpi_leds[led].led = -1;
        }


> +                       return -ENODEV;
> +
>                 if (strstr(cmd, "off")) {
>                         s = TPACPI_LED_OFF;
>                 } else if (strstr(cmd, "on")) {
> --
> 1.7.10.4
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