Re: [PATCH] PCI / tg3: Give up chip reset and carrier losshandling if PCI device is not present

[Michael Chan]

On Sun, 2013-12-01 at 02:34 +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> 
> 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. 

I'm not familiar with the DS1.  Does the tg3 device get removed through
tg3_remove_one() in this case?  What happens when you reconnect the DS1?


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