netdev - Re: [PATCH net-next] r8169: add LED support for RTL8125/RTL8126

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Tue, 13 Feb 2024 04:11:46 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Heiner Kallweit <hkallweit1@...il.com>
Cc: Realtek linux nic maintainers <nic_swsd@...ltek.com>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>,
	David Miller <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] r8169: add LED support for RTL8125/RTL8126

> +static int rtl8125_get_led_reg(int index)
> +{
> +	static const int led_regs[] = { LEDSEL0, LEDSEL1, LEDSEL2, LEDSEL3 };
> +
> +	return led_regs[index];
> +}
> +
> +int rtl8125_set_led_mode(struct rtl8169_private *tp, int index, u16 mode)
> +{
> +	int reg = rtl8125_get_led_reg(index);
> +	struct device *dev = tp_to_dev(tp);
> +	int ret;
> +	u16 val;
> +
> +	ret = pm_runtime_resume_and_get(dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	mutex_lock(&tp->led_lock);
> +	val = RTL_R16(tp, reg) & ~LEDSEL_MASK_8125;
> +	RTL_W16(tp, reg, val | mode);
> +	mutex_unlock(&tp->led_lock);

I'm wondering if this mutex is actually needed. Each LED has its own
register. So you don't need to worry about setting two different LEDs
in parallel. Its just a question of, can the LED core act on one LED
in parallel? I don't know the answer to this, but it does use delayed
work for some things, and that should not run in parallel.

Maybe you can look into this and see if its really needed. Otherwise,
lets keep it, it does no real harm.

     Andrew