linux-kernel - Re: [[PATCH v4]] tty: Fix the keyboard led light display problem

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Date:   Wed, 20 Oct 2021 14:37:18 +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,
        linux-input@...r.kernel.org, 282827961@...com
Subject: Re: [[PATCH v4]] tty: Fix the keyboard led light display problem

On Wed, Oct 20, 2021 at 03:44:23PM +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

Xorg

> 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.

As per Dmitry's remark you need elaborate in the commit message why you can't
do as he suggested.

...

Accordingly to what I see the below has some trailing white spaces,
can you remove them?

> +static void kbd_update_ledstate(struct input_dev *dev)
> +{

> +	unsigned long leds = (unsigned long)ledstate;

Why casting?

> +	
> +	if (test_bit(EV_LED, dev->evbit)) {
> +		if (ledstate == -1U)

This is a bit weird, but I see that this should be changed in entire module.

> +			ledstate = 0;
> +		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); 
> +	}
> +}

...

Can this...

>  	unsigned int leds;
>  	unsigned long flags;
> +	struct kbd_struct *kb = kbd_table + fg_console;
> +
> +	if (kb->kbdmode == VC_OFF)
> +		return;

...be written as

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

	kb = kbd_table + fg_console;
	if (kb->kbdmode == VC_OFF)
		return;

?

-- 
With Best Regards,
Andy Shevchenko