linux-kernel - Re: [PATCH 2/2] Drivers: hv: vmbus: Display nothing in sysfs if monitor

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Date:   Fri, 8 Feb 2019 14:32:09 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Kimberly Brown <kimbrownkd@...il.com>
Cc:     Michael Kelley <mikelley@...rosoft.com>,
        Long Li <longli@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>, devel@...uxdriverproject.org,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Drivers: hv: vmbus: Display nothing in sysfs if
 monitor_allocated not set

On Fri, 8 Feb 2019 05:01:12 -0500
Kimberly Brown <kimbrownkd@...il.com> wrote:

You are right, the current behavior is broken.
It would be good to add a description of under what conditions
monitor is not used. Is this some part of a project emulating
Hyper-V?

> +
> +	if (!hv_dev->channel->offermsg.monitor_allocated)
> +		return sprintf(buf, "\n");

If monitor is not used, why not return an error instead of empty
data. Any program (or user) would have to handle that already.