Rafael J. Wysocki 8496e85c20
PCI / tg3: Give up chip reset and carrier loss handling if PCI device is not present ...
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@intel.com >
Acked-by: Michael Chan <mchan@broadcom.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
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8496e85c20