RE: [Intel-wired-lan] [PATCH v1 5/5] e100: use generic power management

[Brown, Aaron F]

> From: Intel-wired-lan <intel-wired-lan-bounces@xxxxxxxxxx> On Behalf Of
> Vaibhav Gupta
> Sent: Monday, June 29, 2020 2:30 AM
> To: Bjorn Helgaas <helgaas@xxxxxxxxxx>; Bjorn Helgaas
> <bhelgaas@xxxxxxxxxx>; bjorn@xxxxxxxxxxx; Vaibhav Gupta
> <vaibhav.varodek@xxxxxxxxx>; David S. Miller <davem@xxxxxxxxxxxxx>;
> Jakub Kicinski <kuba@xxxxxxxxxx>; Kirsher, Jeffrey T
> <jeffrey.t.kirsher@xxxxxxxxx>
> Cc: Vaibhav Gupta <vaibhavgupta40@xxxxxxxxx>; netdev@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; intel-wired-lan@xxxxxxxxxxxxxxxx;
> skhan@xxxxxxxxxxxxxxxxxxx; linux-kernel-mentees@xxxxxxxxxxxxxxxxxxxxxxxxx
> Subject: [Intel-wired-lan] [PATCH v1 5/5] e100: use generic power management
> 
> With legacy PM hooks, it was the responsibility of a driver to manage PCI
> states and also the device's power state. The generic approach is to let
> PCI core handle the work.
> 
> e100_suspend() calls __e100_shutdown() to perform intermediate tasks.
> __e100_shutdown() calls pci_save_state() which is not recommended.
> 
> e100_suspend() also calls __e100_power_off() which is calling PCI helper
> functions, pci_prepare_to_sleep(), pci_set_power_state(), along with
> pci_wake_from_d3(...,false). Hence, the functin call is removed and wol is
> disabled as earlier using device_wakeup_disable().
> 
> Compile-tested only.
> 
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@xxxxxxxxx>
> ---
>  drivers/net/ethernet/intel/e100.c | 31 +++++++++++++------------------
>  1 file changed, 13 insertions(+), 18 deletions(-)

I do have several e100 based adapters still working and a few old systems with plain old PCI that still function, however all of these older systems have broken power management.  Regardless of if I use the kernel before or after this patch is applied, or even if the e100 driver is loaded or not I can't get a reliable suspend / resume cycle to work on them.

I did run some basic regression with this patch against the remaining pro100 cards I could scrounge up and aside from broken power management (again with or without patch) the system seems good, so (hesitantly) from a regression perspective I will go ahead and say...
Tested-by: Aaron Brown <aaron.f.brown@xxxxxxxxx>