netdev - Re: [PATCH] [v7] net: emac: emac gigabit ethernet controller driver

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Date:	Thu, 11 Aug 2016 10:10:45 -0500
From:	Timur Tabi <timur@...eaurora.org>
To:	Florian Fainelli <f.fainelli@...il.com>,
	Lino Sanfilippo <LinoSanfilippo@....de>,
	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, davem@...emloft.net
Subject: Re: [PATCH] [v7] net: emac: emac gigabit ethernet controller driver

Timur Tabi wrote:
>
> The hang occurs with this loop in napi_disable():
>
>      while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
>          msleep(1);
>
> This loop never exits.  Can you give me a clue as to what could be the
> reason?

I figured it out.  I cannot call napi_disable() twice in a row.  It's 
not smart enough to know that NAPI is already disabled.

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