[+cc Rafael @sisk.pl]
On Mon, Jan 28, 2013 at 4:09 PM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote:
> [+cc Rafael]
>
> On Fri, Jan 18, 2013 at 4:42 AM, Konstantin Khlebnikov
> <khlebnikov@xxxxxxxxxx> wrote:
>> __e1000_shutdown() calls pci_disable_device() at the end, thus __e1000_resume()
>> should call pci_enable_device_mem() to keep enable counter in balance.
>>
>> 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 <khlebnikov@xxxxxxxxxx>
>> Cc: e1000-devel@xxxxxxxxxxxxxxxxxxxxx
>> Cc: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
>> Cc: Bruce Allan <bruce.w.allan@xxxxxxxxx>
>> ---
>> drivers/net/ethernet/intel/e1000e/netdev.c | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
>> index 2853c11..6bce796 100644
>> --- a/drivers/net/ethernet/intel/e1000e/netdev.c
>> +++ b/drivers/net/ethernet/intel/e1000e/netdev.c
>> @@ -5598,6 +5598,13 @@ static int __e1000_resume(struct pci_dev *pdev)
>> pci_restore_state(pdev);
>> pci_save_state(pdev);
>>
>> + err = pci_enable_device_mem(pdev);
>> + if (err) {
>> + dev_err(&pdev->dev,
>> + "Cannot re-enable PCI device after suspend.\n");
>> + return err;
>> + }
>
> Reviewed-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
>
> Seems right to me, and the other users I looked at (igb, azx,
> virtio_pci) call pci_disable_device() in .suspend() and call
> pci_enable_device() in .resume() as you propose to do here.
>
> I assume the e1000 folks will handle this patch (and the previous one).
>
>> +
>> e1000e_set_interrupt_capability(adapter);
>> if (netif_running(netdev)) {
>> err = e1000_request_irq(adapter);
>>
I'm still missing something. In your original report
(https://lkml.org/lkml/2013/1/1/25), you noticed that "enable_cnt ==
0" immediately after boot, after e1000e had claimed the device:
> Right after boot it looks like this:
>
> root@zurg:/sys/bus/pci/devices# lspci
> ...
> 00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
> ...
> root@zurg:/sys/bus/pci/devices# cat 0000\:00\:19.0/enable
> 0
> here must be '1', not '0'
But these patches only change the e1000e suspend/resume path. How
could they change the enable_cnt before you've even done a suspend?
Bjorn
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