PCI: Fix old_size lower bound in calculate_iosize() too

[ Upstream commit ff61f380de5652e723168341480cc7adf1dd6213 ]

Commit 903534fa7d30 ("PCI: Fix resource double counting on remove &
rescan") fixed double counting of mem resources because of old_size being
applied too early.

Fix a similar counting bug on the io resource side.

Link: https://lore.kernel.org/r/20241216175632.4175-6-ilpo.jarvinen@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Xiaochun Lee <lixc17@lenovo.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 8c1ad20a21ec55988822649bc6d33c2b33eb1082..3ce68adda9b7caacab3d3bc991246dbc128ac487 100644 (file)
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -806,11 +806,9 @@ static resource_size_t calculate_iosize(resource_size_t size,
        size = (size & 0xff) + ((size & ~0xffUL) << 2);
 #endif
        size = size + size1;
-       if (size < old_size)
-               size = old_size;
 
-       size = ALIGN(max(size, add_size) + children_add_size, align);
-       return size;
+       size = max(size, add_size) + children_add_size;
+       return ALIGN(max(size, old_size), align);
 }
 
 static resource_size_t calculate_memsize(resource_size_t size,