diff mbox series

[v2,6/8] powerpc/pci: Preserve IORESOURCE_STARTALIGN alignment

Message ID 20240716193246.1909697-7-stewart.hildebrand@amd.com (mailing list archive)
State New
Delegated to: Bjorn Helgaas
Headers show
Series PCI: Align small (<4k) BARs | expand

Commit Message

Stewart Hildebrand July 16, 2024, 7:32 p.m. UTC 
There is a corner case in pcibios_allocate_resources()/alloc_resource()
where the IORESOURCE_STARTALIGN alignment of memory BAR resources gets
overwritten. This does not affect bridge resources. Account for
IORESOURCE_STARTALIGN.

Signed-off-by: Stewart Hildebrand <stewart.hildebrand@amd.com>
---
v1->v2:
* new patch
---
 arch/powerpc/kernel/pci-common.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index eac84d687b53..3f346ad641e0 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1303,8 +1303,10 @@  static inline void alloc_resource(struct pci_dev *dev, int idx)
 			pr_debug("PCI:  parent is %p: %pR\n", pr, pr);
 		/* We'll assign a new address later */
 		r->flags |= IORESOURCE_UNSET;
-		r->end -= r->start;
-		r->start = 0;
+		if (!(r->flags & IORESOURCE_STARTALIGN)) {
+			r->end -= r->start;
+			r->start = 0;
+		}
 	}
 }