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SubjectRe: PROBLEM: kernel 2.4.0-test11-ac1 hang with usb-uhci and emu10k1
On Thu, Nov 23, 2000 at 05:49:52PM +0100, Georg Acher wrote:
> On Thu, Nov 23, 2000 at 04:35:33PM +0000, Rui Sousa wrote:
> > On Thu, 23 Nov 2000, Michael Elkins wrote:
> >
> > Usb controller is sharing a interrupt with the emu10k1.
> > For what I know the emu10k1 driver doesn't have any problem
> > sharing irq's, so I would blame the usb driver...
> usb-uhci doesn't also have any problem with sharing irqs:
> > cat /proc/interrupts
> 10: 5597981 XT-PIC aic7xxx, eth0, usb-uhci
> Hm, no one left to blame...
> I would debug it as follows:
> Place various printks in the initialization code (reset_hc(), start_hc() and
> alloc_uhci) and find out after which printk it hangs. Then it would be
> possible to investigate this further...

It hangs in start_uhci():

/* disable legacy emulation */
pci_write_config_word (dev, USBLEGSUP, USBLEGSUP_DEFAULT);

The loop that the call is in gets iterated 5 times. For i < 4, the
if (!(dev->resource[i].flags & 1))
is TRUE, but on i==4, it drops into the bottom of the loop to execute
check_region() and then pci_write_config_word(), where it hangs.

This only seems to be a problem for initialization. If I load the
usb-uhci.o module before the emu10k1.o module, everything works perfectly
(no lockups).

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