Date: Wed, 11 May 2005 09:17:34 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: hselasky@c2i.net Cc: dga+@cs.cmu.edu Subject: Re: Panic when removing Airprime PC5220 card (usb hub). Message-ID: <20050511.091734.90823828.imp@bsdimp.com> In-Reply-To: <200505111627.04961.hselasky@c2i.net> References: <90204a4c376919189910f8a570d65f48@cs.cmu.edu> <200505111627.04961.hselasky@c2i.net>
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In message: <200505111627.04961.hselasky@c2i.net>
Hans Petter Selasky <hselasky@c2i.net> writes:
: On Wednesday 11 May 2005 09:59, David Andersen wrote:
: > I'm hacking up a quick and dirty driver for the AirPrime PC5220 (EVDO /
: > 1xRTT) card, but I'm encountering a crash unrelated to my driver. The
: > card is a pc card that presents itself as a USB hub with one device
: > hanging off of it. Removing the card from the system causes a kernel
: > panic. The backtrace looks something like:
: >
: > kobj_delete+0xb
: > device_delete_child + 0x98
: > usb_disconnect_port + 0xf3
: > uhub_detach + 0x7a
: > device_detach + 0x57
: > device_delete_child + 0x2b
: > device_delete_child + 0x17
: > ohci_pci_detach + 0x85
: > device_detach + 0x57
: > cardbus_detach_card + 0x93
: > cbb_removal + 0x6f
: > cbb_event_thread + 0xb6
: > fork_exit + 0x74
: > fork_trampoline() + 0x8
: > trap 0x1 eip = 0 esp = 0xedf66d6c
: >
: > (sorry for the poor formatting; I don't have serial debug support at
: > the moment to copy-paste. :)
: >
: I think that the existing USB driver does not allow USB-controllers to be
: detached. At least the root-hub does not allow this. And when they try to
: detach, the devices are deleted twice (which is due to the fact that the code
: was ported from NetBSD, which bus interface is a little different).
Actually, -current has fixed both of these problems. At least that's
what my looking at the source shows in addition to being the one to
make the fixes...
Warner
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