On Thu, 12 Jul 2007, Christoph wrote:
> So,
>
> since yesterday I'm running this:
>
> drivers/usb/host/ehci-hcd.c:611
> /* complete the unlinking of some qh [4.15.2.3] */
> if (status & STS_IAA) {
> if (ehci->reclaim) {
> COUNT (ehci->stats.reclaim);
> ehci->reclaim_ready = 1;
> bh = 1;
> } else {
> printk(KERN_ERR "AUA: ehci reclaim NULL status: %u\n", status);
> }
> }
>
>
> and got (once so far):
>
> Jul 11 16:19:03 denon kernel: [13475.940000] drivers/usb/input/hid-core.c:
> submitting ctrl urb: Get_Report wValue=0x0306 wIndex=0x0000 wLength=2
> Jul 11 16:19:03 denon kernel: [13475.960000] drivers/usb/input/hid-core.c:
> submitting ctrl urb: Get_Report wValue=0x0336 wIndex=0x0000 wLength=2
> Jul 11 16:19:22 denon kernel: [13495.008000] AUA: ehci reclaim NULL status: 32
> Jul 11 16:19:22 denon kernel: [13495.364000] usbdev4.4_ep81:
> ep_device_release called for usbdev4.4_ep81
> Jul 11 16:19:22 denon kernel: [13495.364000] usbdev4.4_ep82:
> ep_device_release called for usbdev4.4_ep82
> Jul 11 16:19:22 denon kernel: [13495.368000] usbdev4.4_ep84:
> ep_device_release called for usbdev4.4_ep84
> Jul 11 16:20:03 denon kernel: [13535.964000] drivers/usb/input/hid-core.c:
> submitting ctrl urb: Get_Report wValue=0x0331 wIndex=0x0000 wLength=3
> Jul 11 16:20:03 denon kernel: [13536.004000] drivers/usb/input/hid-core.c:
> submitting ctrl urb: Get_Report wValue=0x0326 wIndex=0x0000 wLength=3
>
> no crash, all usb devices happy.
>
> Conclusion:
>
> - It's the bug. Anywhere else in the code reclaim_ready will only set if
> ehci->reclaim is valid.
> - I spammed the wrong ML :)
>
> I still have some questions to the usb ppl:
You should ask David Brownell since he's the maintainer for that
driver.
> * what is on status STS_IAA supposed to do?
Interrupt on Async Advance: It indicates that the controller has
advanced the async schedule.
> * should bh set anyway and call ehci_work?
I believe that it was intended as a workaround for some design bugs in
certain EHCI controllers.
> * what is [4.15.2.3] referring to?
It is a section number in the EHCI specification document.
Alan Stern
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