Messages in this thread |  | | Date | Thu, 23 Nov 2000 14:45:17 -0800 | From | Michael Elkins <> | Subject | Re: PROBLEM: kernel 2.4.0-test11-ac1 hang with usb-uhci and emu10k1 |
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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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