[PATCH 4.14 056/183] PCI: Add dummy pci_irqd_intx_xlate() for CONFIG_PCI=n build

From: Greg Kroah-Hartman
Date: Wed Apr 25 2018 - 06:39:26 EST

4.14-stable review patch. If anyone has any objections, please let me know.


From: Niklas Cassel <niklas.cassel@xxxxxxxx>

[ Upstream commit 80db6f08b7af93eddc9487535e6150b220262637 ]

Some hardware can operate in either "host" or "endpoint" mode, which means
there can be both a host bridge driver and an endpoint driver for the same
device. Those drivers share a lot of code, so sometimes they live in the
same source file.

The host bridge driver requires CONFIG_PCI=y because it enumerates PCI
devices below the bridge using the PCI core. The endpoint driver does not
require CONFIG_PCI=y because it runs in an embedded kernel on the other
side of the device, e.g., on an adapter card.

pci-dra7xx.c contains both host and endpoint drivers. If we select only
the endpoint driver (CONFIG_PCI=n and CONFIG_PCI_DRA7XX_EP=y), the unneeded
host driver is still compiled. It references pci_irqd_intx_xlate(), which
is not present when CONFIG_PCI=n, which causes this error:

drivers/pci/dwc/pci-dra7xx.c:229:11: error: 'pci_irqd_intx_xlate' undeclared here (not in a function)

Add a dummy pci_irqd_intx_xlate() for the CONFIG_PCI=n case.

[bhelgaas: changelog]
Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
include/linux/pci.h | 7 +++++++
1 file changed, 7 insertions(+)

--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1688,6 +1688,13 @@ static inline int pci_get_new_domain_nr(
#define dev_is_pf(d) (false)
static inline bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags)
{ return false; }
+static inline int pci_irqd_intx_xlate(struct irq_domain *d,
+ struct device_node *node,
+ const u32 *intspec,
+ unsigned int intsize,
+ unsigned long *out_hwirq,
+ unsigned int *out_type)
+{ return -EINVAL; }
#endif /* CONFIG_PCI */

/* Include architecture-dependent settings and functions */