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FromMartin <>
SubjectRe: ehci_hcd 0000:00:1d.0: HC died; cleaning up
DateMon, 25 Apr 2011 10:18:08 +0200
Martin wrote:

> recently, when plugging in my webcam (UVC driver) my USB stack seems to
> collapse. All USB devices including the mouse & keyboard stop working, the
> syslog says:
>
> Apr 24 19:03:45 arnold kernel: ehci_hcd 0000:00:1d.0: fatal error
> Apr 24 19:03:45 arnold kernel: ehci_hcd 0000:00:1d.0: force halt;
> handshake ffffc90000052024 00004000 00004000 -> -110
> Apr 24 19:03:45 arnold kernel: ehci_hcd 0000:00:1d.0: HC died; cleaning up

I was dabbling a bit further and can re-play the final scene of what must have
happened: the IRQ routine detected a fatal error, threw the hands in the air
and turned the computer into a brick. Question now is what caused the fatal
error.

static irqreturn_t ehci_irq (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
u32 status, masked_status, pcd_status = 0, cmd;
int bh;
spin_lock (&ehci->lock);

status = ehci_readl(ehci, &ehci->regs->status);
[...]
/* PCI errors [4.15.2.4] */
if (unlikely ((status & STS_FATAL) != 0)) {
ehci_err(ehci, "fatal error\n");
dbg_cmd(ehci, "fatal", cmd);
dbg_status(ehci, "fatal", status);
ehci_halt(ehci);
dead:
ehci_reset(ehci);
ehci_writel(ehci, 0, &ehci->regs->configured_flag);
/* generic layer kills/unlinks all urbs, then
* uses ehci_stop to clean up the rest
*/
bh = 1;
}
if (bh)
ehci_work (ehci);
spin_unlock (&ehci->lock);
if (pcd_status)
usb_hcd_poll_rh_status(hcd);
return IRQ_HANDLED;
}

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