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

Andrew Donnellan andrew.donnellan at au1.ibm.com
Tue Aug 30 11:58:44 AEST 2016

Hi stable team,

The following patch, which ended up upstream as 

On 18/08/16 17:35, Andrew Donnellan wrote:
> 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.
> 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.
> Cc: stable at vger.kernel.org
> Signed-off-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>
> ---
> This patch requires http://patchwork.ozlabs.org/patch/658324/. It should go
> through the powerpc tree.

This depends on 2dd9c11b9d4dfbd6c070eab7b81197f65e82f1a0 which didn't 
end up being tagged as cc: stable. It also ended up being applied in the 
wrong order in the powerpc/fixes tree...

Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan at au1.ibm.com  IBM Australia Limited

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