Hi
On 03-05-2022 10:26, Lukas Wunner wrote:
On Mon, May 02, 2022 at 10:33:06PM +0200, Ferry Toth wrote:
Op 27-04-2022 om 07:48 schreef Lukas Wunner:
Do away with link status polling on LAN95XX USB Ethernet
and rely on interrupts instead, thereby reducing bus traffic,
CPU overhead and improving interface bringup latency.
Tested-by: Ferry Toth <fntoth@xxxxxxxxx> (Intel Edison-Arduino)
Thank you!
While testing I noted another problem. I have "DMA-API: debugging enabled by
kernel config" and this (I guess) shows me before and after the patches:
------------[ cut here ]------------
DMA-API: xhci-hcd xhci-hcd.1.auto: cacheline tracking EEXIST, overlapping
mappings aren't supported
That is under investigation here:
https://bugzilla.kernel.org/show_bug.cgi?id=215740
It's apparently a long-standing bug in the USB core which was exposed
by a new WARN() check introduced in 5.14.
I'm not sure this is correct. The issue happens for me only when
connecting the SMSC9414.
Other usb devices I have (memory sticks, wifi, bluetooth) do not trigger
this.
I think we need to consider it might be a valid warning. It seems to be
originating from the same "Workqueue: usb_hub_wq hub_event" though.
Thanks,
Lukas
