[RFC PATCH 4/6] x86: PCI: preserve IORESOURCE_STARTALIGN alignment

[Stewart Hildebrand]

Currently, it's not possible to use the IORESOURCE_STARTALIGN flag on
x86 due to the alignment being overwritten in
pcibios_allocate_dev_resources(). Make one small change in arch/x86 to
make it work on x86.

Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
---
RFC: We don't have enough info in this function to re-calculate the
     alignment value in case of IORESOURCE_STARTALIGN. Luckily our
     alignment value seems to be intact, so just don't touch it...
     Alternatively, we could call pci_reassigndev_resource_alignment()
     after the loop. Would that be preferable?
---
 arch/x86/pci/i386.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index f2f4a5d50b27..ff6e61389ec7 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -283,8 +283,11 @@ static void pcibios_allocate_dev_resources(struct pci_dev *dev, int pass)
 						/* We'll assign a new address later */
 						pcibios_save_fw_addr(dev,
 								idx, r->start);
-						r->end -= r->start;
-						r->start = 0;
+						if (!(r->flags &
+						      IORESOURCE_STARTALIGN)) {
+							r->end -= r->start;
+							r->start = 0;
+						}
 					}
 				}
 			}
-- 
2.45.2