[PATCH 3/4] PCI: of: make a flags argument optional

[Alex Elder <elder@riscstar.com>]

The address of a u32 object is passed to of_pci_get_addr_flags() so
it can be filled with the computed flags value.

Allow a null pointer to be passed, so that the validity of the
resource's flags can be checked without filling in the flags value.

Signed-off-by: Alex Elder <elder@riscstar.com>
---
 drivers/pci/of_property.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/of_property.c b/drivers/pci/of_property.c
index 22fea1905a080..5e1820b8bb79b 100644
--- a/drivers/pci/of_property.c
+++ b/drivers/pci/of_property.c
@@ -82,9 +82,11 @@ static int of_pci_get_addr_flags(const struct resource *res, u32 *flags)
 	else
 		return -EINVAL;
 
-	*flags = FIELD_PREP(OF_PCI_ADDR_FIELD_SS, ss);
-	if (res->flags & IORESOURCE_PREFETCH)
-		*flags |= OF_PCI_ADDR_FIELD_PREFETCH;
+	if (flags) {
+		*flags = FIELD_PREP(OF_PCI_ADDR_FIELD_SS, ss);
+		if (res->flags & IORESOURCE_PREFETCH)
+			*flags |= OF_PCI_ADDR_FIELD_PREFETCH;
+	}
 
 	return 0;
 }
-- 
2.53.0