On Sat, Aug 23, 2014 at 1:19 PM, Schrey <debian-ker...@schreyben.de> wrote:
> Greetings.
>
> On an administered server, I noticed that there's a constant load
> around 0.70 when running kernels 3.10 and 3.12, even if
> the system is doing nothing, and in single user mode.
> Culprit seems to be the process 'khubd'.
> No such effect when running kernels 3.4 or 3.14.
>
> I reverse bisected linux-stable and found that the following commit
> fixes it for me, for both kernel 3.10 and 3.12:
>
> [08d1dec6f4054e3613f32051d9b149d4203ce0d2] usb:hub set hub->change_bits when
> over-current happens
>
>
> Could that commit be backported to the stable 3.10 and 3.12 series?
>
> (Disclaimer: I'm not a programmer, but I'd be happy to help with any testing
> involved)
>
> Regards
> Ingmar
>
> --------------------------------------------------------------------------
>
> $ git diff ac5166bcdb43889a5bd837f5076b78049e1f8bca
> 08d1dec6f4054e3613f32051d9b149d4203ce0d2
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index c1422a0..babba88 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -1147,7 +1147,8 @@ static void hub_activate(struct usb_hub *hub, enum
> hub_activation_type type)
> /* Tell khubd to disconnect the device or
> * check for a new connection
> */
> - if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
> + if (udev || (portstatus & USB_PORT_STAT_CONNECTION)
> ||
> + (portstatus & USB_PORT_STAT_OVERCURRENT))
> set_bit(port1, hub->change_bits);
>
> } else if (portstatus & USB_PORT_STAT_ENABLE) {
>
I think this could be eligible for backporting. I
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