Xen devel - Jul 2008 - [PATCH] pcifront/pciback: Fix Handling of Device Disconnect

When destroying pcifront/pciback, the following message appears in
the guest linux kernel log.

  WARNING: g.e. still in use!
  WARNING: leaking g.e. and page still in use!

This is caused by the wrong disconnect procedure that pcifront
terminates the gnttab foreign access before pciback unmaps the ring.

This patch corrects the handling of pcifront/pciback destruction
sequence. Firstly pcifront cleans up root buses to ensure no more pci_op
is issued, then pciback unmaps the shared ring and finally devices are
discarded.

Signed-off-by: Yosuke Iwamatsu <y-iwamatsu@ab.jp.nec.com>

Regards,
-----------------------
Yosuke Iwamatsu
        NEC Corporation


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