lkml.org 
[lkml]   [2000]   [Nov]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
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).

me
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:47    [W:0.054 / U:25.048 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site