Re: [PATCH] cxl: use pcibios_free_controller_deferred() when removing vPHBs

["Matthew R. Ochs" <mrochs@linux.vnet.ibm.com>]

> On Aug 18, 2016, at 2:35 AM, Andrew Donnellan =
<andrew.donnellan@au1.ibm.com> wrote:
>=20
> When cxl removes a vPHB, it's possible that the pci_controller may be =
freed
> before all references to the devices on the vPHB have been released. =
This
> in turn causes an invalid memory access when the devices are =
eventually
> released, as pcibios_release_device() attempts to call the phb's
> release_device hook.
>=20
> In cxl_pci_vphb_remove(), remove the existing call to
> pcibios_free_controller(). Instead, use
> pcibios_free_controller_deferred() to free the pci_controller after =
all
> devices have been released. Export pci_set_host_bridge_release() so we =
can
> do this.
>=20
> Cc: stable@vger.kernel.org
> Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>

Reviewed-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>