From: Dexuan Cui <decui@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
> Acked-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
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