I just managed to permanently toast my testbox by setting
CONFIG_TASK_SIZE=0xC0000000. Now the box gets either a machine check or
it floods serial console as soon as usb traffic happens.
...
uhci_hcd 0000:00:12.0: host controller process error, something bad happened!
uhci_hcd 0000:00:12.0: host controller halted, very bad!
uhci_hcd 0000:00:12.0: host system error, PCI problems?
uhci_hcd 0000:00:12.0: host controller process error, something bad happened!
...
Can someone add a simple ratelimit to uhci_irq()? :)
--- ./drivers/usb/host/uhci-hcd.c~ 2005-02-02 14:33:54.000000000 +0100
+++ ./drivers/usb/host/uhci-hcd.c 2005-02-02 18:42:49.000000000 +0100
@@ -1655,6 +1655,7 @@ static irqreturn_t uhci_irq(struct usb_h
unsigned short status;
struct urb_priv *urbp, *tmp;
unsigned int age;
+ static unsigned short ratelimit = 0;
/*
* Read the interrupt status, and write it back to clear the
@@ -1666,7 +1667,7 @@ static irqreturn_t uhci_irq(struct usb_h
return IRQ_NONE;
outw(status, io_addr + USBSTS); /* Clear it */
- if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) {
+ if (!ratelimit++ && status & ~(USBSTS_USBINT | USBSTS_ERROR |
USBSTS_RD)) {
if (status & USBSTS_HSE)
dev_err(uhci_dev(uhci), "host system error, "
"PCI problems?\n");
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