linux-kernel - Re: [PATCH] PCI / tg3: Give up chip reset and carrier loss handling if PCI device is not present

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Message-Id: <20131202.160219.837472723344445995.davem@davemloft.net>
Date:	Mon, 02 Dec 2013 16:02:19 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	rjw@...ysocki.net
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-pci@...r.kernel.org,
	bhelgaas@...gle.com, nsujir@...adcom.com, mchan@...adcom.com
Subject: Re: [PATCH] PCI / tg3: Give up chip reset and carrier loss
 handling if PCI device is not present

From: "Rafael J. Wysocki" <rjw@...ysocki.net>
Date: Sun, 01 Dec 2013 02:34:37 +0100

> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Modify tg3_chip_reset() and tg3_close() to check if the PCI network
> adapter device is accessible at all in order to skip poking it or
> trying to handle a carrier loss in vain when that's not the case.
> Introduce a special PCI helper function pci_device_is_present()
> for this purpose.
> 
> Of course, this uncovers the lack of the appropriate RTNL locking
> in tg3_suspend() and tg3_resume(), so add that locking in there
> too.
> 
> These changes prevent tg3 from burning a CPU at 100% load level for
> solid several seconds after the Thunderbolt link is disconnected from
> a Matrox DS1 docking station.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Applied, thanks everyone.
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