linux-kernel - Re: [PATCH v5] tty: Fix the keyboard led light display problem

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Message-ID: <YXAYENOfaRr7bfJ8@smile.fi.intel.com>
Date:   Wed, 20 Oct 2021 16:22:24 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     lianzhi chang <changlianzhi@...ontech.com>
Cc:     linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com,
        gregkh@...uxfoundation.org, jirislaby@...nel.org, 282827961@...com
Subject: Re: [PATCH v5] tty: Fix the keyboard led light display problem

On Wed, Oct 20, 2021 at 08:50:50PM +0800, lianzhi chang wrote:
> Switching from the desktop environment to the tty environment,
> the state of the keyboard led lights and the state of the keyboard
> lock are inconsistent. This is because the attribute kb->kbdmode
> of the tty bound in the desktop environment (xorg) is set to
> VC_OFF, which causes the ledstate and kb->ledflagstate
> values of the bound tty to always be 0, which causes the switch
> from the desktop When to the tty environment, the LED light
> status is inconsistent with the keyboard lock status.

Thank you for an update! My comments below.

...

> +static void kbd_update_ledstate(struct input_dev *dev)
> +{
> +	unsigned long leds;
> +
> +	if (ledstate == -1U)
> +		ledstate = 0;

> +	leds = (unsigned long)ledstate;

It's still unclear why do you need casting here.

> +	if (!!test_bit(LED_NUML, dev->led) != !!test_bit(VC_NUMLOCK, &leds))
> +		ledstate ^= BIT(VC_NUMLOCK);
> +	if (!!test_bit(LED_CAPSL, dev->led) != !!test_bit(VC_CAPSLOCK, &leds))
> +		ledstate ^= BIT(VC_CAPSLOCK);
> +	if (!!test_bit(LED_SCROLLL, dev->led) != !!test_bit(VC_SCROLLOCK, &leds))
> +		ledstate ^= BIT(VC_SCROLLOCK);
> +}

...

>  	unsigned int leds;
>  	unsigned long flags;
> +	struct kbd_struct *kb;

Can we use reversed xmas tree ordering as I showed previously, please?


-- 
With Best Regards,
Andy Shevchenko