Messages in this thread | | | Date | Fri, 15 Oct 2004 12:18:17 -0400 (EDT) | From | Alan Stern <> | Subject | Re: 2.6.9-rc4-mm1 : oops when rmmod uhci_hcd [was: 2.6.9-rc3-mm2 : oops...] |
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On Fri, 15 Oct 2004, Paul Fulghum wrote:
> This looks like it is related to the generic-irq-subsystem patches. > Specifically, adding and removing proc entries for each interrupt. > > Laurent's configuration has two controllers sharing the same interrupt. > The hcd->description for both controllers are identical: "uhci_hcd" > > This string is used when requesting the irq (hcd-pci.c). > request_irq() creates a /proc/irq/nn/uhci_hcd entry. > The IRQ action->dir (one for each device) is a pointer to this entry. > There does not appear to be a check for name collision > when creating this entry. So two identical entries are created, > one for each device. The proc entries are added to the head of > a list so the second entry is 1st in the list. > > When unloading the module, the proc entry is removed when free_irq() > is called. Removal of the proc entry is based on name matching > starting at the head of the list so the 2nd entry is found 1st. > It looks like the proc entry of the second device is removed > when calling free_irq() for the first device. When the > second device is removed, the action->dir has already > been freed causing the oops. > > Comments?
Your explanation sounds entirely reasonable to me. Can you pass it on to the people responsible for the generic-irq subsystem?
Alan Stern
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