netdev - Re: [PATCH v3 net-next] net: dsa: microchip: Add MIB counter reading support

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Date:   Thu, 7 Dec 2017 00:13:32 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Tristram.Ha@...rochip.com
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Pavel Machek <pavel@....cz>,
        Ruediger Schmitt <ruediger.schmitt@...lips.com>,
        muvarov@...il.com, nathan.leigh.conrad@...il.com,
        vivien.didelot@...oirfairelinux.com, UNGLinuxDriver@...rochip.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH v3 net-next] net: dsa: microchip: Add MIB counter reading
 support

> +	for (i = 0; i < dev->mib_port_cnt; i++) {
> +		p = &dev->ports[i];
> +		if (!p->on)
> +			continue;
> +		mib = &p->mib;
> +		mutex_lock(&mib->cnt_mutex);
> +
> +		/* read only dropped counters when link is not up */
> +		if (p->link_down)
> +			p->link_down = 0;
> +		else if (!p->link_up)
> +			mib->cnt_ptr = dev->reg_mib_cnt;

So this is the code you were referring to, when i asked if it can be
up and down at the same time.

I'm having a hard time understand this. Please try to implement this
some other way to make it clear what is going on.

     Andrew