On Wednesday, September 29, 2004 11:17 am, Jesse Barnes wrote:
> I saw in the changelog for usb-ohci that some patches went in awhile back
> to avoid races modifying urb->hcpriv. It *looks* like there may still be a
> window open somewhere given this panic. Has anyone else seen anything
> similar or have any ideas?
>
> Thanks,
> Jesse
>
> <4>hid-core.c: ctrl urb status -115 received
> <1>Unable to handle kernel NULL pointer dereferenceswapper[0]: Oops
> 11012296146944
> <4>
> <4>Pid: 0, comm: swapper
> <4>Registers: cpu 0, sapicid 0x0000, time 36888769
> <4>psr : 0000121008026018 ifs : 800000000000060e ip : [<a000000003e83031>]
> Tainted: P
> <4>ip is at dl_done_list+0xb1/0x300 [usb-ohci]
Forgot to mention, this is with a 2.4 kernel (the ohci driver is identical to
the one in the 2.4 BK tree I believe, and the above offset corresponds to
line 1750 of dl_done_list:
0x6f71 is in dl_done_list (usb-ohci.c:1750).
1745
1746 if (!(urb->transfer_flags & USB_DISABLE_SPD)
1747 && (cc == TD_DATAUNDERRUN))
1748 cc = TD_CC_NOERROR;
1749
1750 if (++(urb_priv->td_cnt) == urb_priv->length) {
1751 if ((ed->state & (ED_OPER | ED_UNLINK))
1752 && (urb_priv->state !=
URB_DEL)) {
1753 urb->status = cc_to_error[cc];
1754 sohci_return_urb (ohci, urb);
Thanks,
Jesse
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