netdev - Re: [PATCH] [v6] net: emac: emac gigabit ethernet controller driver

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Date:	Wed, 29 Jun 2016 03:55:52 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	timur@...eaurora.org
Cc:	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, sdharia@...eaurora.org,
	shankerd@...eaurora.org, vikrams@...eaurora.org,
	cov@...eaurora.org, gavidov@...eaurora.org, robh+dt@...nel.org,
	andrew@...n.ch, bjorn.andersson@...aro.org, mlangsdo@...hat.com,
	jcm@...hat.com, agross@...eaurora.org, f.fainelli@...il.com
Subject: Re: [PATCH] [v6] net: emac: emac gigabit ethernet controller driver

From: Timur Tabi <timur@...eaurora.org>
Date: Fri, 24 Jun 2016 18:46:48 -0500

> +	while (test_and_set_bit(EMAC_STATUS_RESETTING, &adpt->status))
> +		msleep(20); /* Reset might take few 10s of ms */
 ...
> +	while (test_and_set_bit(EMAC_STATUS_RESETTING, &adpt->status))
> +		msleep(20); /* Reset might take few 10s of ms */

You cannot spin in the kernel potentially forever if the tested
condition is never met.

Instead you must have some limit for the loop, and signal a failure
if it is reached.