linux-kernel - Re: [PATCH] ACPI/Battery: Retry to get Battery information if failed during probing

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Message-ID: <alpine.DEB.2.02.1406121415150.8305@chino.kir.corp.google.com>
Date:	Thu, 12 Jun 2014 14:17:02 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Lan Tianyu <tianyu.lan@...el.com>
cc:	rjw@...ysocki.net, lenb@...nel.org, naszar@...ru,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] ACPI/Battery: Retry to get Battery information if failed
 during probing

On Thu, 12 Jun 2014, Lan Tianyu wrote:

> The retry time is set by randomly and not accurate because don't know
> when EC will work normally. Set the retry time to 5 just in order to
> make sure battery driver probing sucessfully every time,
> 

Ok, I was hoping to avoid the excessive wait if it will never actually 
succeed but I assume there's some evidence that it can succeed after 40ms, 
60ms, etc.  Please consider the following instead:

	for (i = 0; i < 5; i++) {
		/* Comment on why we need a delay in between retries */
		if (i)
			msleep(20);
		result = acpi_battery_update(battery, false);
		if (!result)
			break;
	}
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