linux-kernel - Re: [PATCH] net: fec: turn on device when extracting statistics

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Date:   Sun, 27 Nov 2016 20:29:45 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     nikita.yoush@...entembedded.com
Cc:     fugang.duan@....com, troy.kisky@...ndarydevices.com,
        andrew@...n.ch, eric@...int.com, tremyfr@...il.com,
        johannes@...solutions.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, cphealy@...il.com
Subject: Re: [PATCH] net: fec: turn on device when extracting statistics

From: Nikita Yushchenko <nikita.yoush@...entembedded.com>
Date: Fri, 25 Nov 2016 13:02:00 +0300

> +	int i, ret;
> +
> +	ret = pm_runtime_get_sync(&fep->pdev->dev);
> +	if (IS_ERR_VALUE(ret)) {
> +		memset(data, 0, sizeof(*data) * ARRAY_SIZE(fec_stats));
> +		return;
> +	}

This really isn't the way to do this.

When the device is suspended and the clocks are going to be stopped,
you must fetch the statistic values into a software copy and provide
those if the device is suspended when statistics are requested.