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    SubjectRE: [PATCH 2/3] PCI: hv: Add hv_pci_remove_slots() when we unload the driver
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    From: Dexuan Cui <decui@microsoft.com> Sent: Monday, March 4, 2019 1:35 PM
    >
    > When we unload pci-hyperv, the host doesn't send us a PCI_EJECT message.
    > In this case we also need to make sure the sysfs pci slot directory
    > is removed, otherwise "cat /sys/bus/pci/slots/2/address" will trigger
    > "BUG: unable to handle kernel paging request" (I noticed the issue when
    > systemd-dev crashed for me when I unloaded the driver). And, if we
    > unload/reload the driver several times, we'll have multiple pci slot
    > directories in /sys/bus/pci/slots/ like this:
    >
    > root@localhost:~# ls -rtl /sys/bus/pci/slots/
    > total 0
    > drwxr-xr-x 2 root root 0 Feb 7 10:49 2
    > drwxr-xr-x 2 root root 0 Feb 7 10:49 2-1
    > drwxr-xr-x 2 root root 0 Feb 7 10:51 2-2
    >
    > The patch adds the missing code.
    >
    > Fixes: a15f2c08c708 ("PCI: hv: support reporting serial number as slot information")
    > Signed-off-by: Dexuan Cui <decui@microsoft.com>
    > Acked-by: Stephen Hemminger <sthemmin@microsoft.com>
    > Cc: stable@vger.kernel.org

    Reviewed-by: Michael Kelley <mikelley@microsoft.com>

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