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

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Message-ID: <YWhI/DzNjivU6jQ6@smile.fi.intel.com>
Date:   Thu, 14 Oct 2021 18:13:00 +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] input&tty: Fix the keyboard led light display problem

On Thu, Oct 14, 2021 at 03:16:27PM +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.

...

> +void update_value_ledstate(unsigned int flag, unsigned int value)
> +{
> +	unsigned int bit;

unsigned long bit;

(see below why)

> +	switch (flag) {
> +	case LED_NUML:
> +		bit = VC_NUMLOCK;
> +		break;
> +	case LED_CAPSL:
> +		bit = VC_CAPSLOCK;
> +		break;
> +	case LED_SCROLLL:
> +		bit = VC_SCROLLOCK;
> +		break;
> +	default:
> +		WARN_ON_ONCE(1);
> +		return;
> +	}

> +	if (value)
> +		ledstate |= BIT(bit);
> +	else
> +		ledstate &= ~BIT(BIT);

NIH assign_bit().

On top of that, what is BIT as parameter does in the else branch? Have you
compiled this?

> +}

...

>  	unsigned int leds;
>  	unsigned long flags;

> +	struct kbd_struct *kb = kbd_table + fg_console;

Reversed xmas tree order?

...

>  extern void setledstate(struct kbd_struct *kbd, unsigned int led);

>  

Not sure if wee need this blank line, since both functions are from the same
(functional) group.

> +extern void update_value_ledstate(int flag, int value);

-- 
With Best Regards,
Andy Shevchenko