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powerpc/pci: Remove OF node back pointer from pci_dn

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The check_req() helper uses pci_get_pdn() to get an OF node pointer.
pci_get_pdn() returns a pci_dn pointer which either:
1) from the OF node returned by pci_device_to_OF_node();
2) from the parent child_list where entries don't have OF node pointers.
Since check_req() does not care about 2), it can call
pci_device_to_OF_node() directly, hence the change.

The find_pe_dn() helper uses embedded pci_dn to get an OF node which is
also stored in edev->pdev so let's take a shortcut and call
pci_device_to_OF_node() directly.

With these 2 changes, we can finally get rid of the OF node back pointer.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Alexey Kardashevskiy
2017-08-29 17:34:04 +10:00
committed by Michael Ellerman
parent 14db3d52d3
commit f1e08232ed
3 changed files with 2 additions and 11 deletions
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1
arch/powerpc/include/asm/pci-bridge.h
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@@ -195,7 +195,6 @@ struct pci_dn {
struct pci_dn *parent;
struct pci_controller *phb; /* for pci devices */
struct iommu_table_group *table_group; /* for phb's or bridges */
struct device_node *node; /* back-pointer to the device_node */
int pci_ext_config_space; /* for pci devices */