On Wed, 23 Jun 2010 16:04:10 +0900
Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx> wrote:
> I encountered the problem that /proc/bus/pci/XX/YY is not removed even
> after the corresponding device is hot-removed, if the file is still
> being opened. In addtion, accessing this file in this situation causes
> kernel panic (see below).
>
> Becasue the pci_proc_detach_device() doesn't call remove_proc_entry()
> if struct proc_dir_entry->count > 1, access to /proc/bus/pci/XX/YY
> would refer to struct pci_dev that was already freed.
>
> Though I don't know why the check for proc_dir_entry->count was added,
> I don't think it is needed. Removing this check fixes the problem.
>
> Steps to reproduce
> ------------------
> # cd /sys/bus/pci/slots/2/
> # PROC_BUS_PCI_FILE=/proc/bus/pci/`awk -F: '{print $2"/"$3}' < address`.0
> # sleep 10000 < $PROC_BUS_PCI_FILE &
> # echo 0 > power
> # while true; do cat $PROC_BUS_PCI_FILE > /dev/null; done
>
applied to my linux-next branch, thanks.
--
Jesse Barnes, Intel Open Source Technology Center
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