Rafael J. Wysocki wrote:
> On Monday, January 28, 2013 04:05:33 PM Bjorn Helgaas wrote:
>> [+cc Rafael, author of patch you cited]
>>
>> On Fri, Jan 18, 2013 at 4:42 AM, Konstantin Khlebnikov
>> <khlebni...@openvz.org> wrote:
>>> Bug was introduced in commit 23606cf5d1192c2b17912cb2ef6e62f9b11de133
>>> ("e1000e / PCI / PM: Add basic runtime PM support (rev. 4)") in v2.6.35
>>>
>>> Signed-off-by: Konstantin Khlebnikov<khlebni...@openvz.org>
>>> Cc: e1000-devel@lists.sourceforge.net
>>> Cc: Jeff Kirsher<jeffrey.t.kirs...@intel.com>
>>> Cc: Bruce Allan<bruce.w.al...@intel.com>
>>> ---
>>> drivers/net/ethernet/intel/e1000e/netdev.c | 13 ++++++++-----
>>> 1 file changed, 8 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c
>>> b/drivers/net/ethernet/intel/e1000e/netdev.c
>>> index fbf75fd..2853c11 100644
>>> --- a/drivers/net/ethernet/intel/e1000e/netdev.c
>>> +++ b/drivers/net/ethernet/intel/e1000e/netdev.c
>>> @@ -5691,14 +5691,17 @@ static int e1000_runtime_suspend(struct device *dev)
>>> struct pci_dev *pdev = to_pci_dev(dev);
>>> struct net_device *netdev = pci_get_drvdata(pdev);
>>> struct e1000_adapter *adapter = netdev_priv(netdev);
>>> + int retval;
>>> + bool wake;
>>>
>>> - if (e1000e_pm_ready(adapter)) {
>>> - bool wake;
>>> + if (!e1000e_pm_ready(adapter))
>>> + return 0;
>>>
>>> - __e1000_shutdown(pdev,&wake, true);
>>> - }
>>> + retval = __e1000_shutdown(pdev,&wake, true);
>>> + if (!retval)
>>> + e1000_power_off(pdev, true, wake);
>>>
>>> - return 0;
>>> + return retval;
>>> }
>>>
>>> static int e1000_idle(struct device *dev)
>>>
>
> I'd like the changelog to say what the bug is and how it is being fixed in
> general terms.
Ok, my bad.
Problem: ethernet device does not work (no carrier signal).
Right after boot it goes to runtime-suspend and never wake up.
Original code (before your commit) calls pci_prepare_to_sleep() and it
calls pci_enable_wake() and switches device to one of D3 state.
It seems redundant, because pci_pm_runtime_suspend() do the same thing
after calling ->runtime_suspend callback. Or rather it did it before commit
42eca2302146fed51335b95128e949ee6f54478f ("PCI: Don't touch card regs after
runtime suspend D3") and third patch aimed fix this damage.
More over seems like calling pci_enable_wake() from e1000e isn't enough for my
case,
because my enthernet cannot wakeup from runtime-suspend without third patch.
Seems like it's because pci_enable_wake() and pci_finish_runtime_suspend()
calls different pratform-pm callbacks -- platform_pci_run_wake() /
platform_pci_sleep_wake().
All this looks messy and I don't know how it should work.
If you prefer to minimize changes -- I can test how it would work without
first (this) patch. Probably fine.
>
> Thanks,
> Rafael
>
>
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